subject:(arsenic)

Queens University

1. Opio, Faith. Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal .

Degree: Mining Engineering, 2013, Queens University

URL: http://hdl.handle.net/1974/7798

► Fe(III)-As(III) bearing precipitates have been successfully used for arsenic immobilization in copper smelter weak acid effluents. However, knowledge on their precise characteristics is very limited… (more)

▼ Fe(III)-As(III) bearing precipitates have been successfully used for arsenic immobilization in copper smelter weak acid effluents. However, knowledge on their precise characteristics is very limited compared to ferric arsenate precipitates which are the preferred disposal option. As(III) is the dominant arsenic species in the weak acid effluents, and high costs are incurred in oxidizing As(III) to As(V) prior to ferric arsenate precipitation. Detailed characterization of Fe(III)-As(III) bearing residues is fundamental for accurate prediction of their long term stability. Synchrotron-based analysis of the Fe(III)-As(III) bearing precipitates from the effluent treatment plant (ETP) at Xstrata’s Horne Copper Smelter in Quebec identified ferric arsenate and gypsum as the major phases, and other minor phases including zinc hydroxide and franklinite. The predominant As species was As(V) which accounted for 49 to 84% of the total As in the Horne ETP sample. The high As(V) levels detected in the Horne ETP co-precipitates may be due to the partial oxidation of As(III) during prolonged storage, prior to synchrotron analysis. Tooeleite was investigated as an alternative potential disposal option for As(III) immobilization from copper smelter weak acid effluents. Lime neutralization of an equimolar Fe(III)-As(III) bearing weak acid solution resulted in about 85% As being removed at pH 2.7 and the formation of gypsum-bearing tooeleite at pH 2 to 3.5. At >pH 4, the rapid transformation of tooeleite occurred to form a poorly crystalline equimolar ferric arsenite which was stable at pH 6 to 10. Co-precipitation tests also showed that equimolar ferric arsenite was precipitated at pH>4. US EPA Toxicity Characteristic Leaching Procedure (TCLP) analysis indicated that both tooeleite and ferric arsenite have relatively high As solubilities. Calcination of tooeleite was explored as a method for improving the stability of tooeleite, and calcination of tooeleite in air at 600˚C produced a ferric arsenate calcine with a TCLP solubility of <5 mg/L As. The calcine iii produced from the lime-precipitated tooeleite at 600 ˚C was found to contain an iron arsenate (Fe7As6O24) which had a slightly higher TCLP As solubility of 13.1 mg/L. The precipitation of tooeleite from an As(III)-bearing weak acid and calcination of the resultant precipitate may offer a new process for As(III) fixation from copper smelter weak acid effluents.

Subjects/Keywords: Arsenic

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APA (6^th Edition):

Opio, F. (2013). Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7798

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Opio, Faith. “Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal .” 2013. Thesis, Queens University. Accessed March 01, 2021. http://hdl.handle.net/1974/7798.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Opio, Faith. “Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal .” 2013. Web. 01 Mar 2021.

Vancouver:

Opio F. Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal . [Internet] [Thesis]. Queens University; 2013. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1974/7798.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Opio F. Investigation of Fe(III)-As(III) bearing phases and their potential for arsenic disposal . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/7798

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

2. Bromstad, MacKenzie Jane. The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT .

Degree: Geological Sciences and Geological Engineering, 2011, Queens University

URL: http://hdl.handle.net/1974/6885

► Approximately 20,000 tonnes of arsenic (As)-bearing emissions from roasting arsenopyrite ore were aerially released from 1949-1999 at Giant Mine, located outside Yellowknife, NT. As part… (more)

▼ Approximately 20,000 tonnes of arsenic (As)-bearing emissions from roasting arsenopyrite ore were aerially released from 1949-1999 at Giant Mine, located outside Yellowknife, NT. As part of the process used to free refractory gold (Au) from arsenopyrite (FeAsS), roasting created As-bearing roaster off-gases that condensed into As2O3, one of the most toxic As compounds to humans. Roaster emissions also contained some As-bearing iron (Fe)- oxides. Arsenic emission controls were first implemented in 1951, and by the time the emission control process was completely refined in 1963, 86% of the total aerial As emissions at Giant had been released into the surrounding area. The continued presence of roaster-derived As2O3 in surface soils at Giant has been previously documented despite its theoretical instability in oxidizing surface environments. Wrye (2008) found As concentrations in roaster-affected soils occurring on rock outcrop (covering ~30% of the Giant property) greater than in many other surface soils; most outcrop soils were not considered when delineating areas of contaminated material for future removal in the Giant Mine Remediation Plan (currently undergoing environmental assessment). To investigate roaster-derived As persistence, outcrop soils and soil pore waters were analyzed. Comparing proportions of As, Sb, and Au concentrations in soil samples and historic As2O3-rich dust captured by emission controls show that most of the roaster-derived As in soils at Giant was likely deposited before 1964. Thin section examination has shown that while the vast majority of discrete As hosts in soils are As2O3, textural relationships and certain secondary As hosts in soils indicate that As2O3 is not static in surface soils and could be transforming over time, albeit very slowly. Bulk chemical relationships among As, antimony (Sb), and carbon support this. Topographic restriction by rock outcrops and dry, cold climate probably play a large role in elevated As concentrations and As2O3 persistence in outcrop soils. In light of possible future human exposure, As bioaccessibility from three adjacent samples was determined for synthetic human gastric (34%) and lung (18%) fluids.

Subjects/Keywords: geochemistry ; arsenic ; arsenic trioxide ; geology

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APA (6^th Edition):

Bromstad, M. J. (2011). The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6885

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bromstad, MacKenzie Jane. “The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT .” 2011. Thesis, Queens University. Accessed March 01, 2021. http://hdl.handle.net/1974/6885.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bromstad, MacKenzie Jane. “The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT .” 2011. Web. 01 Mar 2021.

Vancouver:

Bromstad MJ. The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT . [Internet] [Thesis]. Queens University; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1974/6885.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bromstad MJ. The characterization, persistence, and bioaccessibility of roaster-derived arsenic in surface soils at Giant Mine, Yellowknife, NT . [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6885

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

3. Sun, Xuan. Arsenic Speciation in Poultry Kidney.

Degree: MS, Department of Chemistry, 2014, University of Alberta

URL: https://era.library.ualberta.ca/files/cf7623c68k

► An organoarsenic compound, 3-nitro-4-hydroxyphenyl arsenic acid (also known as Roxarsone), has been used as a feed additive. Roxarsone was approved by the Food and Drug… (more)

Subjects/Keywords: arsenic; kidney

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APA (6^th Edition):

Sun, X. (2014). Arsenic Speciation in Poultry Kidney. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cf7623c68k

Chicago Manual of Style (16^th Edition):

Sun, Xuan. “Arsenic Speciation in Poultry Kidney.” 2014. Masters Thesis, University of Alberta. Accessed March 01, 2021. https://era.library.ualberta.ca/files/cf7623c68k.

MLA Handbook (7^th Edition):

Sun, Xuan. “Arsenic Speciation in Poultry Kidney.” 2014. Web. 01 Mar 2021.

Vancouver:

Sun X. Arsenic Speciation in Poultry Kidney. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Mar 01]. Available from: https://era.library.ualberta.ca/files/cf7623c68k.

Council of Science Editors:

Sun X. Arsenic Speciation in Poultry Kidney. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/cf7623c68k

University of Saskatchewan

4. Rafi, Saif Al. ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12880

► Contamination of arsenic (As) in ground water and surface water is a widespread problem throughout the world. Industrial development and increase of anthropogenic activities such… (more)

▼ Contamination of arsenic (As) in ground water and surface water is a widespread problem throughout the world. Industrial development and increase of anthropogenic activities such as mining are an issue of concern due to their pollution of the environment. Because of its toxicity to human and environmental health, remediation of As-contaminated water has become a high priority and a number of As treatment technologies have been developed. Common treatment technologies for As treatment are coagulation, oxidation, filtration processes, electrochemical methods, adsorption, phytoremediation, and bioremediation. Common difficulties with conventional treatment techniques may include the potential production of toxic by-products, limited efficiencies, operational difficulties, and high capital and operation/maintenance costs. Bioremediation may be used to promote the growth of indigenous water and wastewater bacteria, such as sulphate reducing bacteria (SRB), to remove As from these matrices in an effective and environmentally friendly manner. The goal of thesis was to investigate and assess the As bioremediation potential for mine pit water at in situ temperature (8 °C) using molasses as a carbon source. Six sets of experimental batch reactors were prepared including positive controls, negative controls, and molasses amended reactors. A problem with determining As speciation is the need for advanced analytical instruments for the analysis that are not readily available. Thus, suitable sample processing and storage procedures are vital to preserve the species from the time of sampling to analysis. To assess these processing and storage procedures, three methods were used: (1) no acid; (2) ethylene diaminete tetra acetic acid (EDTA); and (3) 2% nitric acid (HNO3). An ion-exchange method was used for the separation of arsenite (As(III)) and arsenate (As(V)) prior to inductively coupled plasma mass spectrometry (ICP-MS), while other metal(loid)s and bacteria were determined using ICP-MS and MiSeq 16S rRNA V4 analyses, respectively. Results showed that iron reducing bacteria increased the As release rate from waste rock over time leading to higher aqueous concentrations in molasses treatment reactors. For the preservation, it was found that filtered samples stored at 4 °C without acidification provided the best results for maintaining appropriate As speciation. Overall, using molasses as a carbon source led to increased As solution concentrations which was not the anticipated outcome. Thus, bioremediation of As in mine pit water needs further investigation and optimization. Advisors/Committee Members: McPhedran, Kerry, Chang, Wonjae, Lindsay, Matt, Abdelrasoul, Amira.

Subjects/Keywords: Arsenic; Bioremediation

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APA (6^th Edition):

Rafi, S. A. (2020). ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rafi, Saif Al. “ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER.” 2020. Thesis, University of Saskatchewan. Accessed March 01, 2021. http://hdl.handle.net/10388/12880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rafi, Saif Al. “ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER.” 2020. Web. 01 Mar 2021.

Vancouver:

Rafi SA. ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10388/12880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rafi SA. ASSESSMENT OF BIOREMEDIATION FOR TREATMENT OF ARSENIC IN MINE PIT WATER. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

5. Verbuyst, Brent. Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/15972

► The release of As from old mine sites can persist long after cessation of mining activities. This project combines field and laboratory research components at… (more)

▼ The release of As from old mine sites can persist long after cessation of mining activities. This project combines field and laboratory research components at the Long Lake Gold Mine site, near Sudbury, Ontario. The mine was discovered in 1908 and operated intermittently from 1909 until 1939; the mine was later abandoned and is now the responsibility of the Ontario Ministry of Energy, Northern Development and Mines. Arsenic-bearing sulfide-rich tailings were deposited in three topographic depressions near the mill, named TA-01, TA-02 and TA-03. The purpose of this project is to evaluate controls on As biogeochemistry in the Long Lake tailings areas and to provide a detailed geochemical and mineralogical investigation of aqueous- and solid-phase As. During the past 100 years, extensive sulfide oxidation of sulfide minerals in the Long Lake tailings has resulted in acidic conditions and high concentrations of dissolved metals and SO4 in the tailings pore water. Four nests of monitoring equipment were installed within TA-01, to assist in the understanding of the biogeochemical behaviour of As in the tailings and groundwater. Core samples of the sand cap, tailings, and underlying soils were collected for geochemical, mineralogical, and microbiological characterization. Mineralogical and geochemical characterization of the TA-01 tailings showed a zone of sulfide oxidation extending ~0.3-1.0 m below the tailings surface. Arsenic K-edge X-ray absorption near edge structure (XANES) and bulk As K-edge high energy resolution fluorescence detection X-ray spectroscopy (HERFD-XAS) produced results consistent with the mineralogical investigation. Pore water within the near surface tailings was characterized by low pH (2.0-3.9) and elevated concentrations of dissolved metals and SO4. Groundwater was characterized by circumneutral pH values and low concentrations of dissolved metals and SO4. Arsenic concentrations of up to 500 mg L-1 were measured in the tailings pore water and 70 mg L-1 in the underlying aquifer materials. The highest dissolved As concentrations were measured at shallow depths in the tailings corresponding with the lowest pH values and at the depth of the tailings profile near the organic layer interface. The tailings pore water and groundwater were characterized by δ34S-SO4 and δ13C-DIC fractionation indicating the likelihood of dissimilatory sulfate reduction (DSR). Results of this study will be used to inform and complement remediation efforts being undertaken by the Ministry of Energy, Northern Development and Mines. This study will provide information on the nature of mechanisms that affect the release and attenuation of As in over 100 year old sub-aerially deposited sulfide tailings.

Subjects/Keywords: Geochemistry; Arsenic

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APA (6^th Edition):

Verbuyst, B. (2020). Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15972

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Verbuyst, Brent. “Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON.” 2020. Thesis, University of Waterloo. Accessed March 01, 2021. http://hdl.handle.net/10012/15972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Verbuyst, Brent. “Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON.” 2020. Web. 01 Mar 2021.

Vancouver:

Verbuyst B. Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10012/15972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Verbuyst B. Evaluating Controls on Arsenic Geochemistry at the Long Lake Gold Mine in Sudbury, ON. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15972

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waikato

6. Lloyd, Nicholas. A Reinvestigation of Salvarsan and Related Arsenic Chemistry.

Degree: 2011, University of Waikato

URL: http://hdl.handle.net/10289/5460

► In 1910 the first deliberately targeted search for a new chemotherapeutic agent came to fruition when Paul Ehrlich introduced Salvarsan for the treatment of syphilis.… (more)

▼ In 1910 the first deliberately targeted search for a new chemotherapeutic agent came to fruition when Paul Ehrlich introduced Salvarsan for the treatment of syphilis. This thesis presents a detailed review of the history and literature leading up to and following on from Ehrlich’s discovery and thoroughly investigates the chemistry of Salvarsan and related species. A series of arylarsonic acids was prepared and fully characterised by electrospray mass spectrometry, NMR and X-ray crystallography for six examples. A detailed analysis of the hydrogen bonding in crystals of these molecules showed that they adopt several characteristic motifs which govern the packing in the crystals. Two of the examples containing NH2 groups crystallised as zwitterions while one NH2 containing example containing other bulky groups was is its molecular form. Salvarsan (cyclo 3-amino-4-hydroxyphenylarsenic(I)) was prepared by several different methods and analysed in detail using high resolution electrospray mass spectroscopy. This showed that Salvarsan consists of small cyclic species of the type (RAs)n where R is 3-NH2-4-OHC6H3 and n is three or greater. The dominant species in an aqueous solution of Salvarsan were found to be (RAs)3 and (RAs)5 . A detailed analysis is presented of impurities in Salvarsan prepared by different methods and also in a sample of original commercial Salvarsan. Mixtures of (RAs)n and (R’As)n exchange R groups in aqueous solution at room temperature, as shown by ESI-MS. ESI-MS studies are reported for the oxidation product of Salvarsan, RAs(OH)2 (commercially known as Mapharsen) and related As(III) compounds. Oligomers involving As-O-As linkages were found in solution and one tetrameric example (R = 3-NO2-4-OHC6H3) was isolated and structurally characterised. Preliminary ESI-MS studies showed that As(III) species bind to thioredoxin, a possible target for the pharmaceutical activity of Salvarsan and its derivatives. Advisors/Committee Members: Nicholson, Brian K (advisor), Morgan, Hugh W (advisor).

Subjects/Keywords: Salvarsan; Arsenic

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APA (6^th Edition):

Lloyd, N. (2011). A Reinvestigation of Salvarsan and Related Arsenic Chemistry. (Doctoral Dissertation). University of Waikato. Retrieved from http://hdl.handle.net/10289/5460

Chicago Manual of Style (16^th Edition):

Lloyd, Nicholas. “A Reinvestigation of Salvarsan and Related Arsenic Chemistry. ” 2011. Doctoral Dissertation, University of Waikato. Accessed March 01, 2021. http://hdl.handle.net/10289/5460.

MLA Handbook (7^th Edition):

Lloyd, Nicholas. “A Reinvestigation of Salvarsan and Related Arsenic Chemistry. ” 2011. Web. 01 Mar 2021.

Vancouver:

Lloyd N. A Reinvestigation of Salvarsan and Related Arsenic Chemistry. [Internet] [Doctoral dissertation]. University of Waikato; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10289/5460.

Council of Science Editors:

Lloyd N. A Reinvestigation of Salvarsan and Related Arsenic Chemistry. [Doctoral Dissertation]. University of Waikato; 2011. Available from: http://hdl.handle.net/10289/5460

Washington University in St. Louis

7. Wan, Wei. Arsenic Removal From Drinking Water By Electrocoagulation.

Degree: MA, Energy, Environmental and Chemical Engineering, 2010, Washington University in St. Louis

URL: https://openscholarship.wustl.edu/etd/511

► Exposure to arsenic through drinking water poses a threat to human health. Electrocoagulation is an emerging water treatment technology that involves electrolytic oxidation of anode… (more)

Subjects/Keywords: arsenic

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APA (6^th Edition):

Wan, W. (2010). Arsenic Removal From Drinking Water By Electrocoagulation. (Thesis). Washington University in St. Louis. Retrieved from https://openscholarship.wustl.edu/etd/511

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wan, Wei. “Arsenic Removal From Drinking Water By Electrocoagulation.” 2010. Thesis, Washington University in St. Louis. Accessed March 01, 2021. https://openscholarship.wustl.edu/etd/511.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wan, Wei. “Arsenic Removal From Drinking Water By Electrocoagulation.” 2010. Web. 01 Mar 2021.

Vancouver:

Wan W. Arsenic Removal From Drinking Water By Electrocoagulation. [Internet] [Thesis]. Washington University in St. Louis; 2010. [cited 2021 Mar 01]. Available from: https://openscholarship.wustl.edu/etd/511.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wan W. Arsenic Removal From Drinking Water By Electrocoagulation. [Thesis]. Washington University in St. Louis; 2010. Available from: https://openscholarship.wustl.edu/etd/511

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of British Columbia

8. Bedford, Ronald Ernest. A study of the spark spectra of arsenic.

Degree: PhD, Physics, 1955, University of British Columbia

URL: http://hdl.handle.net/2429/40360

► The spectra of arsenic have been photographed from the infra-red to the vacuum ultraviolet with a 21 foot grating, a 2 metre vacuum grating, a… (more)

Subjects/Keywords: Arsenic

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APA (6^th Edition):

Bedford, R. E. (1955). A study of the spark spectra of arsenic. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/40360

Chicago Manual of Style (16^th Edition):

Bedford, Ronald Ernest. “A study of the spark spectra of arsenic.” 1955. Doctoral Dissertation, University of British Columbia. Accessed March 01, 2021. http://hdl.handle.net/2429/40360.

MLA Handbook (7^th Edition):

Bedford, Ronald Ernest. “A study of the spark spectra of arsenic.” 1955. Web. 01 Mar 2021.

Vancouver:

Bedford RE. A study of the spark spectra of arsenic. [Internet] [Doctoral dissertation]. University of British Columbia; 1955. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2429/40360.

Council of Science Editors:

Bedford RE. A study of the spark spectra of arsenic. [Doctoral Dissertation]. University of British Columbia; 1955. Available from: http://hdl.handle.net/2429/40360

Oregon State University

9. Smitherman, Lauren L. Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon.

Degree: MS, Water Resources Science, 2015, Oregon State University

URL: http://hdl.handle.net/1957/57428

► Harney County contains defining characteristics of regions containing arsenic within the groundwater such as its location in the western United States, unique closed basin geography,… (more)

▼ Harney County contains defining characteristics of regions containing arsenic within the groundwater such as its location in the western United States, unique closed basin geography, complex geology, and seasonal groundwater level fluctuations. Confirmation of arsenic concentrations above the Maximum Contaminant Level Drinking Water Standard of 10 μg/L has been observed on a recurring basis. Private land owners within the Harney Basin solely depend on private wells for domestic, agricultural, and livestock water supply and are not required to test for or meet the 10 μg/L MCL water quality standards for public water systems, as established by the United States Environmental Protection Agency. The purpose of this study was to expand on previous arsenic investigations to determine if a relationship exists between arsenic occurrence and the geography, hydrology, and geology within the Harney Basin. The effects of well depth, latitude/longitude, and hydrogeologic units were analyzed to create a regional depiction of arsenic occurrence through a conceptual model. For each sample, total arsenic, pH, and conductivity was measured. A total of 140 samples were evaluated, 91 were integrated from previous studies and 49 were collected throughout the Harney Basin as part of this study. For each of the 49 samples collected in this study, total arsenic was quantified by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and semi-quantitative arsenic field screening tests were also performed for comparison. These data were used to determine if a link exists between groundwater arsenic occurrence, geology, and the source aquifer. The secondary purpose of this study was to assess the accuracy and precision of the field tests to inform the community if a more available and less-expensive option than ICP-MS could be used for routine monitoring. Data acquisition was challenging due to citizen concerns about anonymity, difficulty contacting land owners, and their perceived effects on land values. The analysis identified that arsenic contamination is widespread throughout the valley. While one hydrogeologic unit provided statistically higher concentrations of arsenic, there is no single clear geogenic source of arsenic. The results from the field test produced questionable results, with both overestimates and underestimates of concentrations compared with the ICP-MS analysis. The results of this research will be informative to groundwater users and public health officials and the results will be confidentially shared with stakeholders. Communities reliant on private well water with similar geologic characteristics may utilize this report to understand the importance of arsenic testing. Advisors/Committee Members: Jarvis, Todd (advisor), Kile, Molly (committee member).

Subjects/Keywords: Arsenic; Groundwater – Arsenic content – Oregon – Harney County

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APA (6^th Edition):

Smitherman, L. L. (2015). Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/57428

Chicago Manual of Style (16^th Edition):

Smitherman, Lauren L. “Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon.” 2015. Masters Thesis, Oregon State University. Accessed March 01, 2021. http://hdl.handle.net/1957/57428.

MLA Handbook (7^th Edition):

Smitherman, Lauren L. “Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon.” 2015. Web. 01 Mar 2021.

Vancouver:

Smitherman LL. Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1957/57428.

Council of Science Editors:

Smitherman LL. Forensic Hydrogeography : Assessing Groundwater Arsenic Concentrations and Testing Methods within the Harney Basin, Oregon. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/57428

Nelson Mandela Metropolitan University

10. Majavu, Avela. Modeling of arsenic removal from aqueous media using selected coagulants.

Degree: MTech, Faculty of Science, 2010, Nelson Mandela Metropolitan University

URL: http://hdl.handle.net/10948/d1017100

► The waste water from the industrial production of the herbicide monosodium methyl arsenate was treated using coagulation. The coagulation process as developed in this research… (more)

Subjects/Keywords: Arsenic wastes; Water – Purification – Arsenic removal; Coagulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Majavu, A. (2010). Modeling of arsenic removal from aqueous media using selected coagulants. (Masters Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/d1017100

Chicago Manual of Style (16^th Edition):

Majavu, Avela. “Modeling of arsenic removal from aqueous media using selected coagulants.” 2010. Masters Thesis, Nelson Mandela Metropolitan University. Accessed March 01, 2021. http://hdl.handle.net/10948/d1017100.

MLA Handbook (7^th Edition):

Majavu, Avela. “Modeling of arsenic removal from aqueous media using selected coagulants.” 2010. Web. 01 Mar 2021.

Vancouver:

Majavu A. Modeling of arsenic removal from aqueous media using selected coagulants. [Internet] [Masters thesis]. Nelson Mandela Metropolitan University; 2010. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10948/d1017100.

Council of Science Editors:

Majavu A. Modeling of arsenic removal from aqueous media using selected coagulants. [Masters Thesis]. Nelson Mandela Metropolitan University; 2010. Available from: http://hdl.handle.net/10948/d1017100

Duquesne University

11. Reiter, Robert James. Microbial Arsenic Transformation in Near Subsurface Environments.

Degree: PhD, Biological Sciences, 2015, Duquesne University

URL: https://dsc.duq.edu/etd/1094

► In the first part of this study, environmental bacterial arsenic transformation was investigated in anthropogenically arsenic contaminated subsurface sediments from the former Vineland Chemical Company… (more)

▼ In the first part of this study, environmental bacterial arsenic transformation was investigated in anthropogenically arsenic contaminated subsurface sediments from the former Vineland Chemical Company in Vineland, NJ. Subsurface sediments from the vadose (371 mg/kg arsenic) and aquifer (81 mg/kg arsenic) zones and an off-site surface sediment (0.7 mg/kg arsenic; control) were used as inocula for enrichment cultures with selective media to assess for microbial arsenic metabolic activity. Arsenite (As(III)), monomethyl arsenic acid (MMA) and dimethyl arsenic acid (DMA) were provided as electron donors, while arsenate (As(V)) was provided as an electron acceptor. An anion exchange chromatography method with conductivity and UV/Vis detection was developed and utilized to investigate arsenic transformations under each selective condition. While demethylation and arsenite oxidation were not observed, there was strong As(V) reduction to As(III) activity in the enrichments amended with lactate and As(V). Polymerase chain reaction (PCR) was used to amplify arrA and arsC genes, followed by cloning and sequencing. Both vadose and aquifer enrichments gave positive results for arrA (respiratory arsenate reductase) and arsC (arsenic resistance), while only arsC amplified from the off-site. Both 16S rRNA genes and the ribosomal intergenic spacer (RIS) genes were used to assess community diversity. The results indicate a diverse community with As(V) respiring bacteria. In the second part of this study, the utility of ion chromatography (IC) in speciating inorganic (As(V), As(III)) and organic (MMA, DMA) was assessed. The As(V) and roxarsone respiring Alkaliphilus oremlandii OhILAs was cultured and the spent medium analyzed. Under the conditions used, OhILAs failed to produce any As(III) and As(V) when grown on roxarsone and lactate; however, As(V) to As(III) reduction was observed when grown in the presence of lactate and As(V). In the third part of this study, microcosms were used to assess bacterial arsenic transformation in cores from a coal ash impoundment. A medium was formulated based on the water chemistry of the system. As(V) respiration was detected at all four depths tested (0-2m; 2-4m, 4-6m, and 8-10m), with the surface sediments showing the greatest rates. Advisors/Committee Members: John Stolz, Partha Basu, Peter Castric, Nancy Trun.

Subjects/Keywords: DARP; ARM; Biogeochemical; Arsenic Transformation; Arsenic Mobilization

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APA (6^th Edition):

Reiter, R. J. (2015). Microbial Arsenic Transformation in Near Subsurface Environments. (Doctoral Dissertation). Duquesne University. Retrieved from https://dsc.duq.edu/etd/1094

Chicago Manual of Style (16^th Edition):

Reiter, Robert James. “Microbial Arsenic Transformation in Near Subsurface Environments.” 2015. Doctoral Dissertation, Duquesne University. Accessed March 01, 2021. https://dsc.duq.edu/etd/1094.

MLA Handbook (7^th Edition):

Reiter, Robert James. “Microbial Arsenic Transformation in Near Subsurface Environments.” 2015. Web. 01 Mar 2021.

Vancouver:

Reiter RJ. Microbial Arsenic Transformation in Near Subsurface Environments. [Internet] [Doctoral dissertation]. Duquesne University; 2015. [cited 2021 Mar 01]. Available from: https://dsc.duq.edu/etd/1094.

Council of Science Editors:

Reiter RJ. Microbial Arsenic Transformation in Near Subsurface Environments. [Doctoral Dissertation]. Duquesne University; 2015. Available from: https://dsc.duq.edu/etd/1094

University of Alberta

12. McKnight-Whitford, Anthony Nicholai. Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection.

Degree: PhD, Department of Chemistry, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/rf55z9287

► Arsenic is a widespread environmental contaminant whose toxicity depends on its valence and its chemical form. Arsenic species have been typically determined using high pressure… (more)

▼ Arsenic is a widespread environmental contaminant whose toxicity depends on its valence and its chemical form. Arsenic species have been typically determined using high pressure liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICPMS), however ICPMS cannot differentiate the co-eluting arsenic species. This thesis explores the use of electrospray mass spectrometry (ESI-MS) with HPLC separation for arsenic speciation and demonstrates applications of various HPLC-ESI-MS methods for the determination of toxicologically and environmentally relevant arsenic compounds. The trivalent arsenicals, such as arsenite (AsIII) and its metabolites monomethylarsonous acid (MMAIII) and dimethylarsinous acid (DMAIII) are not easily detected using ESI-MS due to their poor ionizability, but they are known to have high affinity for thiols. Thus, the easily ionizable dithiol dimercaptosuccinic acid (DMSA) was used to derivatize the trivalent arsenicals prior to ESI-MS. Selection of the derivatizing reaction was based on studies of arsenic-thiol interactions. An HPLC-ESI-MS/MS method was developed for the detection of derivatized AsIII, DMAIII and MMAIII and underivatized arsenate (AsV), monomethylarsonic acid (MMAV) and dimethylarsinic acid (DMAV), and was used to analyze multiple types of samples including urine, plasma and water. One set of groundwater samples from the site of a former pesticide manufacturing plant contained concentrations of MMAIII as high as 3.9-274 mg/L, the highest ever observed in the environment. Another HPLC-ESI-MS/MS method, without the need of derivatization, was developed for the detection of the toxic thio-arsenicals dimethylmonothioarsinic acid (DMMTAV) and monomethylmonothioarsonic acid (MMMTAV). DMMTAV was present in rat plasma and human urine and both DMMTAV and MMMTAV were detected in rat urine. The method of derivatization and ESI-MS/MS detection was extended to the speciation of inorganic SbIII and SbV. The use of the HPLC-ESI-MS/MS method using DMPS derivatization enabled the speciation of SbIII and SbV in water samples from mine waste.

Subjects/Keywords: Arsenic; ESI-MS

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APA (6^th Edition):

McKnight-Whitford, A. N. (2010). Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/rf55z9287

Chicago Manual of Style (16^th Edition):

McKnight-Whitford, Anthony Nicholai. “Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection.” 2010. Doctoral Dissertation, University of Alberta. Accessed March 01, 2021. https://era.library.ualberta.ca/files/rf55z9287.

MLA Handbook (7^th Edition):

McKnight-Whitford, Anthony Nicholai. “Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection.” 2010. Web. 01 Mar 2021.

Vancouver:

McKnight-Whitford AN. Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection. [Internet] [Doctoral dissertation]. University of Alberta; 2010. [cited 2021 Mar 01]. Available from: https://era.library.ualberta.ca/files/rf55z9287.

Council of Science Editors:

McKnight-Whitford AN. Arsenic Binding to Thiols and Applications to Electrospray Mass Spectrometry Detection. [Doctoral Dissertation]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/rf55z9287

University of Alberta

13. Roggenbeck, Barbara A. Hepatobiliary Transport of Arsenic.

Degree: PhD, Department of Physiology, 2016, University of Alberta

URL: https://era.library.ualberta.ca/files/c1j92g751z

► Arsenic is a proven human carcinogen and associated with a myriad of other adverse health effects. This metalloid is methylated in human liver to monomethylarsonic… (more)

▼ Arsenic is a proven human carcinogen and associated with a myriad of other adverse health effects. This metalloid is methylated in human liver to monomethylarsonic acid (MMAV), monomethylarsonous acid (MMAIII), dimethylarsinic acid (DMAV), and dimethylarsinous acid (DMAIII) and eliminated predominantly in urine. Hepatic basolateral transport of As species is ultimately critical for urinary elimination; however, these pathways are not fully elucidated in humans. Based on rodent studies it appears that the ATP binding-cassette (ABC) transporters in subfamily, multidrug resistance proteins (MRPs/ABCCs), are likely to play a role in efflux of As out of the hepatocyte. The current studies use several techniques to identify MRPs that may be important for hepatobiliary transport of As. Sandwich cultured human hepatocytes (SCHH) were used as a physiological model to characterize hepatic efflux of As. Cytotoxicity assays were used to screen the basolateral MRP candidate proteins MRP3 (ABCC3) and MRP5 (ABCC5) for their ability to transport AsIII, AsV, MMAIII, MMAV, DMAIII, and DMAV. The data obtained from the SCHH studies, the cytotoxicity studies, and studies done with MRP4 (ABCC4) by other members of the lab led us to use RNA silencing to further investigate the role of MRP4 in the basolateral efflux of As. The SCHH model showed that basolateral transport of As was temperature- and GSH-dependent and inhibited by the MRP inhibitor MK-571. Canalicular efflux was completely lost after GSH depletion suggesting MRP2 (ABCC2)-dependence. Treatment of SCHH with AsIII (0.1-1 µM) dose-dependently increased MRP2 and MRP4 levels, but not MRP1 (ABCC1), MRP6 (ABCC6), or aquaglyceroporin 9. Treatment of SCHH with oltipraz (Nrf2 activator) increased MRP4 levels and basolateral efflux of As. In contrast, oltipraz increased MRP2 levels without increasing biliary excretion. These results suggest As basolateral transport prevails over biliary excretion and is mediated at least in part by an MRP. Candidate MRP proteins at the basolateral surface of the hepatocytes include MRP3, MRP4, MRP5, and MRP6. HEK293 cells overexpressing MRP3 or MRP5 did not confer resistance to AsIII, AsV, MMAIII, MMAV, DMAIII, or DMAV in cytotoxicity assays and provided evidence that MRP3 and MRP5 do not provide cellular protection against arsenicals. The role of MRP6 is under investigation. MRP4/ABCC4 is a high affinity transporter of DMAV and the diglutathione conjugate of MMAIII (MMA(GS)2), therefore, its role in As efflux was further investigated using RNA silencing in SCHH. Knockdown of MRP4 using shRNA containing lentiviral particles did not decrease the levels of any arsenicals in the efflux media of two SCHH preparations under the conditions tested. Non-specific effects of the lentivirus made interpretation of the RNA silencing experiments difficult however, we conclude that other transport proteins localized to the basolateral membrane of hepatocytes should be considered for their contribution to the efflux of As into blood for eventual urinary elimination.

Subjects/Keywords: hepatocytes; arsenic; transport

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roggenbeck, B. A. (2016). Hepatobiliary Transport of Arsenic. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c1j92g751z

Chicago Manual of Style (16^th Edition):

Roggenbeck, Barbara A. “Hepatobiliary Transport of Arsenic.” 2016. Doctoral Dissertation, University of Alberta. Accessed March 01, 2021. https://era.library.ualberta.ca/files/c1j92g751z.

MLA Handbook (7^th Edition):

Roggenbeck, Barbara A. “Hepatobiliary Transport of Arsenic.” 2016. Web. 01 Mar 2021.

Vancouver:

Roggenbeck BA. Hepatobiliary Transport of Arsenic. [Internet] [Doctoral dissertation]. University of Alberta; 2016. [cited 2021 Mar 01]. Available from: https://era.library.ualberta.ca/files/c1j92g751z.

Council of Science Editors:

Roggenbeck BA. Hepatobiliary Transport of Arsenic. [Doctoral Dissertation]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c1j92g751z

Cornell University

14. Lim, Maya. Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae).

Degree: M.S., Ecology, Ecology, 2015, Cornell University

URL: http://hdl.handle.net/1813/41138

► Arsenic, once commonly used as a pesticide, is highly toxic to consumers but also can influence plant metabolism and growth. Therefore, soil arsenic can affect… (more)

Subjects/Keywords: arsenic; plant; insect

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lim, M. (2015). Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae). (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/41138

Chicago Manual of Style (16^th Edition):

Lim, Maya. “Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae).” 2015. Masters Thesis, Cornell University. Accessed March 01, 2021. http://hdl.handle.net/1813/41138.

MLA Handbook (7^th Edition):

Lim, Maya. “Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae).” 2015. Web. 01 Mar 2021.

Vancouver:

Lim M. Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae). [Internet] [Masters thesis]. Cornell University; 2015. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1813/41138.

Council of Science Editors:

Lim M. Arsenic Uptake By Sweet Alyssum (Lobularia Maritima): Effects On Plant Metabolism And Larvae Of The Small White Butterfly (Pieris Rapae). [Masters Thesis]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/41138

Texas A&M University

15. Wang, Xiaoxuan. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.

Degree: MS, Civil Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173716

► Arsenic (As) is a toxic element widely encountered in the environment and a food safety concern. The use of engineered nanoparticles (ENPs) has grown rapidly… (more)

▼ Arsenic (As) is a toxic element widely encountered in the environment and a food safety concern. The use of engineered nanoparticles (ENPs) has grown rapidly due to the unique properties that make them beneficial in a wide range of technologies. Studies abound concerning the phytotoxicity of ENPs and their accumulation in plant tissues. However, investigations on ENPs interactions with co-existing contaminants in a plant system, especially with redox sensitive heavy metals, are rare. Two ENPs of interest are cerium oxide nanoparticles (CeO₂ NPs) and zinc oxide nanoparticles (ZnO NPs). The goals of this study were to: (1) determine the impact of CeO₂ NPs and ZnO NPs on the As accumulation in rice, and (2) evaluate whether inorganic As species including both As(III) and As (V) may modify the plant uptake and accumulation of the metal elements of co-present CeO₂ NPs and ZnO NPs. This was done by administering either 1 mg/L of As(III) or As(V), or 100 mg/L of CeO₂ NPs or ZnO NPs or Zn²⁺, or different combinations of As and ENPs or ions at the same concentrations to rice plants. Rice (Oryza sativa) was utilized in this study as a model plant duo to its high propensity for As uptake, and its widespread consumption as a staple food around the world. A hydroponic system was used to avoid the compounding effects of soil and the microorganisms in soil. The results indicated that CeO₂NPs did not show significant effect on total As plant accumulation. The presence of ZnO NPs and Zn²⁺ significantly reduced total As in rice seedlings, except for the concentration of total As in rice shoots with the co-presence of ZnO NPs and As(III). The co-presence of As significantly increased Ce in rice shoots in the CeO₂ NPs + As(III) treatment but did not affect the plant uptake of Zn from ZnO NPs or Zn²⁺. The results confirmed the active interactions between ENPs and co-existing inorganic As species and the extent to which their interactions depend on the properties of ENPs as well as the initial oxidation state of As. Advisors/Committee Members: Ma, Xingmao (advisor), Chu, Kung-Hui (committee member), Dou, Fugen (committee member).

Subjects/Keywords: Arsenic; Nanoparticles; Rice

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, X. (2018). Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173716

Chicago Manual of Style (16^th Edition):

Wang, Xiaoxuan. “Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.” 2018. Masters Thesis, Texas A&M University. Accessed March 01, 2021. http://hdl.handle.net/1969.1/173716.

MLA Handbook (7^th Edition):

Wang, Xiaoxuan. “Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.” 2018. Web. 01 Mar 2021.

Vancouver:

Wang X. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1969.1/173716.

Council of Science Editors:

Wang X. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173716

Texas A&M University

16. Wang, Xiaoxuan. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.

Degree: MS, Civil Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173811

► Arsenic (As) is a toxic element widely encountered in the environment and a food safety concern. The use of engineered nanoparticles (ENPs) has grown rapidly… (more)

▼ Arsenic (As) is a toxic element widely encountered in the environment and a food safety concern. The use of engineered nanoparticles (ENPs) has grown rapidly due to the unique properties that make them beneficial in a wide range of technologies. Studies abound concerning the phytotoxicity of ENPs and their accumulation in plant tissues. However, investigations on ENPs interactions with co-existing contaminants in a plant system, especially with redox sensitive heavy metals, are rare. Two ENPs of interest are cerium oxide nanoparticles (CeO₂ NPs) and zinc oxide nanoparticles (ZnO NPs). The goals of this study were to: (1) determine the impact of CeO₂ NPs and ZnO NPs on the As accumulation in rice, and (2) evaluate whether inorganic As species including both As(III) and As (V) may modify the plant uptake and accumulation of the metal elements of co-present CeO₂ NPs and ZnO NPs. This was done by administering either 1 mg/L of As(III) or As(V), or 100 mg/L of CeO₂ NPs or ZnO NPs or Zn²⁺, or different combinations of As and ENPs or ions at the same concentrations to rice plants. Rice (Oryza sativa) was utilized in this study as a model plant duo to its high propensity for As uptake, and its widespread consumption as a staple food around the world. A hydroponic system was used to avoid the compounding effects of soil and the microorganisms in soil. The results indicated that CeO₂NPs did not show significant effect on total As plant accumulation. The presence of ZnO NPs and Zn²⁺ significantly reduced total As in rice seedlings, except for the concentration of total As in rice shoots with the co-presence of ZnO NPs and As(III). The co-presence of As significantly increased Ce in rice shoots in the CeO₂ NPs + As(III) treatment but did not affect the plant uptake of Zn from ZnO NPs or Zn²⁺. The results confirmed the active interactions between ENPs and co-existing inorganic As species and the extent to which their interactions depend on the properties of ENPs as well as the initial oxidation state of As. Advisors/Committee Members: Ma, Xingmao (advisor), Chu, Kung-Hui (committee member), Dou, Fugen (committee member).

Subjects/Keywords: Arsenic; Nanoparticles; Rice

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, X. (2018). Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173811

Chicago Manual of Style (16^th Edition):

Wang, Xiaoxuan. “Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.” 2018. Masters Thesis, Texas A&M University. Accessed March 01, 2021. http://hdl.handle.net/1969.1/173811.

MLA Handbook (7^th Edition):

Wang, Xiaoxuan. “Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System.” 2018. Web. 01 Mar 2021.

Vancouver:

Wang X. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1969.1/173811.

Council of Science Editors:

Wang X. Elucidating the Effects of Cerium Oxide Nanoparticles and Zinc Oxide Nanoparticles on Arsenic Uptake by Rice (Oryza sativa) in a Hydroponic System. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173811

Queens University

17. Sealey, Heather. Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada .

Degree: Geological Sciences and Geological Engineering, 2011, Queens University

URL: http://hdl.handle.net/1974/6577

► Elevated arsenic (As) concentrations in surface water from storing mine tailings in lakes can have a negative impact on local and downstream vegetation and aquatic… (more)

▼ Elevated arsenic (As) concentrations in surface water from storing mine tailings in lakes can have a negative impact on local and downstream vegetation and aquatic life. At Terra Mine, an abandoned silver and copper mine in the Northwest Territories, tailings storage in Ho-Hum Lake has resulted in dissolved As concentrations of 50-80 μg/L, exceeding the 5 μg/L maximum guideline for aquatic life. A natural wetland located downstream appears to be attenuating As from surface water. The objectives of this study was to understand the sources of As to the wetland, the effectiveness of the wetland to sequester As, the form and stability of As in the sediments, the processes controlling As mobility, and the effect of seasonal changes in the wetland in the dissolved phase. Arsenic bound to the sediments was determined by analyzing for bulk composition, and As speciation and element association were identified using synchrotron-based bulk XANES and ESEM analysis. Arsenic enters the wetland by surface flow from Ho-Hum Lake, subsurface flow through the waste rock airstrip, and by windblown dust. In spring, dissolved As concentrations in surface water increased downstream. In late summer, a decrease in concentration was observed in the upstream portion of the wetland, however As returned to lake concentrations further downstream. Sediment As concentrations increased over the summer. ESEM and bulk XANES indicate that As was associated with (oxy)hydroxides and secondary sulphides. In the spring, when water levels were high from snow melt, (oxy)hydroxides formed and captured As, while sulphide oxidation in the sediments lead to the release of As into surface water. Over the summer, the onset of reducing conditions from microbial activity drove the formation of As-bearing sulphides and dissolution of (oxy)hydroxides. While As was accumulating in the sediments at most sites in the wetland over the summer, these results suggest that the wetland was not effectively sequestering dissolved As from the surface water, and that sediment-water cycling of As in the wetland as a result of seasonal redox variations were contributing As in the surface water.

Subjects/Keywords: Wetlands ; Arsenic ; Geochemistry

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APA (6^th Edition):

Sealey, H. (2011). Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6577

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sealey, Heather. “Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada .” 2011. Thesis, Queens University. Accessed March 01, 2021. http://hdl.handle.net/1974/6577.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sealey, Heather. “Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada .” 2011. Web. 01 Mar 2021.

Vancouver:

Sealey H. Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada . [Internet] [Thesis]. Queens University; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1974/6577.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sealey H. Arsenic Mobility and Attenuation in a Natural Wetland at Terra Mine, Northwest Territories, Canada . [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6577

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

18. Tudor, Mary S. Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species.

Degree: PhD, Zoology - Biology, 2018, University of Florida

URL: https://ufdc.ufl.edu/UFE0052014

► Previous studies have shown that environmental variability impacts the processes of sexual selection, and that a single genome can produce a range of phenotypes (i.e.,… (more)

▼ Previous studies have shown that environmental variability impacts the processes of sexual selection, and that a single genome can produce a range of phenotypes (i.e., trait plasticity) across variable environments. While historically this variation in trait expression was thought of as non-adaptive (i.e., extraneous noise in trait expression), more recent studies have shown that plasticity in sexually selected traits can be adaptive as an organism can express traits more optimally across variable environments. For example, environmental variation can result in the evolution of multiple male signaling traits and variation in female mate preferences. Both natural and anthropogenic sources of environmental variation have been shown to have impacts on male signaling behaviors and female mate preferences. The goal of my second chapter was to examine the effects of social environment on female mate preferences hierarchies for multiple male traits. While studies have examined the effects of social environment on single female mate preferences across social environments and multiple preferences within a static environment it is still unknown how females may prioritize multiple preferences (e.g., male dominance versus paternal care traits) differently across variable environments (e.g., variable levels of male-male competition). I found that sand goby (Pomatoschistus minutus) females do prioritize preferences for male traits and that a females' current environment impacts their spawning decisions more heavily than past environments. During choice tests, where there was low male-male competition for nesting sites, females cared more about the expression of paternal care behavior (i.e., egg fanning) than male dominance (i.e., male body size). However, there was a trend for the interaction between prior social experience and male egg fanning where females that have prior experience with high levels of male-male competition for nesting sites mated with males that spent less time egg fanning indicating that past exposure impact female preferences, but not to the same extent as the current social environment. Prior studies have shown that experience with variable social environments can have long lasting effects on female mate preferences, but these studies were conducted in species with fundamentally different life history traits (i.e., few versus many reproductive events). Future work making direct comparisons between species with different life history traits is needed to further elucidate the aspects of social experience that impact female mate preferences. The goal of my third and fourth chapters was to examine the effects of exposure to acute and biologically relevant concentrations of a ubiquitous metalloid (i.e., arsenic) on male and female mating behavior in Betta splendens. While studies have shown the effects of anthropogenic contaminant exposure on reproductive behaviors no studies have been done with metals or metalloids. In chapter three, I examined the effects of arsenic exposure on males' ability to gain… Advisors/Committee Members: ST MARY,COLETTE MARIE (committee chair), BROCKMANN,H J (committee member), KIMBALL,REBECCA T (committee member), HAHN,DANIEL ALLEN (committee member), VAN BENEDEN,REBECCA (committee member).

Subjects/Keywords: arsenic – plasticiy – preference

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APA (6^th Edition):

Tudor, M. S. (2018). Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0052014

Chicago Manual of Style (16^th Edition):

Tudor, Mary S. “Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species.” 2018. Doctoral Dissertation, University of Florida. Accessed March 01, 2021. https://ufdc.ufl.edu/UFE0052014.

MLA Handbook (7^th Edition):

Tudor, Mary S. “Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species.” 2018. Web. 01 Mar 2021.

Vancouver:

Tudor MS. Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species. [Internet] [Doctoral dissertation]. University of Florida; 2018. [cited 2021 Mar 01]. Available from: https://ufdc.ufl.edu/UFE0052014.

Council of Science Editors:

Tudor MS. Impacts of Social Environment and Contaminant Exposure on Sexually Selected Traits in Two Fish Species. [Doctoral Dissertation]. University of Florida; 2018. Available from: https://ufdc.ufl.edu/UFE0052014

Duquesne University

19. Chen, Xue. Genomes of Three Arsenic Metabolizing Bacteria.

Degree: MS, Environmental Science and Management (ESM), 2015, Duquesne University

URL: https://dsc.duq.edu/etd/398

► Although arsenic is toxic to most living cells, many microbes live in environments with high concentrations of arsenic. In addition to being resistant to arsenic,… (more)

Subjects/Keywords: Arsenic; Bacteria; Genome

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APA (6^th Edition):

Chen, X. (2015). Genomes of Three Arsenic Metabolizing Bacteria. (Masters Thesis). Duquesne University. Retrieved from https://dsc.duq.edu/etd/398

Chicago Manual of Style (16^th Edition):

Chen, Xue. “Genomes of Three Arsenic Metabolizing Bacteria.” 2015. Masters Thesis, Duquesne University. Accessed March 01, 2021. https://dsc.duq.edu/etd/398.

MLA Handbook (7^th Edition):

Chen, Xue. “Genomes of Three Arsenic Metabolizing Bacteria.” 2015. Web. 01 Mar 2021.

Vancouver:

Chen X. Genomes of Three Arsenic Metabolizing Bacteria. [Internet] [Masters thesis]. Duquesne University; 2015. [cited 2021 Mar 01]. Available from: https://dsc.duq.edu/etd/398.

Council of Science Editors:

Chen X. Genomes of Three Arsenic Metabolizing Bacteria. [Masters Thesis]. Duquesne University; 2015. Available from: https://dsc.duq.edu/etd/398

University of Georgia

20. Burgess, Elizabeth Adrienne. Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/26016

► The combination of geological activity and geographic isolation make Uzon Caldera, Kamchatka, Russia, an ideal location for geomicrobiological research. Two hydrothermal pools, Arkashin Shurf (Arkashin)… (more)

▼ The combination of geological activity and geographic isolation make Uzon Caldera, Kamchatka, Russia, an ideal location for geomicrobiological research. Two hydrothermal pools, Arkashin Shurf (Arkashin) and Zavarzin Spring (Zavarzin), were selected for geochemical and microbiological characterization over multiple years and scales. Arkashin has high arsenic concentrations relative to Zavarzin, which has abundant elemental sulfur. Grab samples were analyzed from a geomicrobiological perspective, to describe community structure in each pool based on sequence, lipid and stable isotope data. Based on sequence analysis and lipid distribution, Arkashin was inhabited by Hydrogenobaculum-related primary producers. Other community members included Desulfurella-, “Sphingobacteria“- and Variovorax-related microorganisms. Zavarzin was dominated by Chloroflexus, and heterotrophic microorganisms, including some Crenarchaeota. The community in Zavarzin was more diverse than in Arkashin. Additionally, nearly 20% of the sequences from Arkashin and over 50% of the sequences from Zavarzin represented uncultured and unclassified microorganisms. Core sample analyses indicated that in each pool the microbiology and geochemistry changed with depth over visible changes in color and texture. Surface sub-samples were similar to the grab samples. Autotrophic surface communities were replaced with microorganisms dependent on heterotrophic inputs or reduced hydrothermal carbon as depth increased. In Arkashin, variation in color of strata was associated with varying concentrations of As and S. The highest As and S concentrations were associated with the lowest concentrations of phospholipid fatty acids (PLFA). In Zavarzin, the highest sulfur and PLFA concentrations were associated with fine-textured surface samples. The patterns observed indicate the biomass and composition of microbial communities can shift considerably in association with macroscopically visible changes in geochemical conditions. The described geomicrobiological data represent sulfur biogeochemistry under distinct geochemical conditions. As- and S-concentrations are linked significantly in Arkashin. The microorganisms in Arkashin play a role in As-S cycling, in part through sulfate-reduction. In Zavarzin, elemental sulfur is abundant and sulfide from sulfate-reduction is a minor component of total sulfur concentrations. Cataloging the diversity and distribution of microorganisms in contemporary thermal environments and elucidating some of the variations that occur with depth at the edges of hydrothermal pools add to knowledge about the intersection of geochemistry and microbiology.

Subjects/Keywords: arsenic; thermophiles; microecology

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APA (6^th Edition):

Burgess, E. A. (2014). Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/26016

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Burgess, Elizabeth Adrienne. “Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry.” 2014. Thesis, University of Georgia. Accessed March 01, 2021. http://hdl.handle.net/10724/26016.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Burgess, Elizabeth Adrienne. “Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry.” 2014. Web. 01 Mar 2021.

Vancouver:

Burgess EA. Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10724/26016.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Burgess EA. Geomicrobiological description of two contemporary hydrothermal pools in Uzon Caldera, Kamchatka, Russia, as models for sulfur biogeochemistry. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/26016

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Aberdeen

21. Aborode, Fatai Adigun. Selenium and arsenic speciation in plants.

Degree: PhD, 2013, University of Aberdeen

URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152527150005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577621

► Selenium and arsenic are important metalloids in the food chain from nutritional and toxicological point of view. These two metalloids are potentially enriched through geogenic… (more)

▼ Selenium and arsenic are important metalloids in the food chain from nutritional and toxicological point of view. These two metalloids are potentially enriched through geogenic processes and anthropogenic activities and they could sometimes co-exist in nature and become available to plants thereby entering the food chain. While selenium is known as an essential element to humans, it could also be toxic. Arsenic on the other hand is a potentially toxic element posing serious health risks to livestock and humans. They have been found to neutralise each other’s effects in animals but their interactions in plants are not well understood. Speciation analysis, which is a set of activities leading to identification and quantification of different forms or species of elements present in an entity, is required for a holistic understanding of the mechanisms and interactions involved in the plants’ metabolism of contaminants and essential elements. Many techniques are currently being used for speciation of selenium and arsenic in plants and they sometimes give contradictory outcomes. The hyphenation of HPLC with MS and synchrotron techniques are the two most commonly used state of the art techniques for speciation of these metalloids. This research therefore sought to access, explore and/ or develop analytical methods appropriate for the speciation of selenium and arsenic in plants. Many selenium and arsenic species have been identified and reported in the literature using well established procedures. The presence of elemental selenium in plants has also been widely reported in plants but to our knowledge this presence has never been experimentally proven and fully quantified. Because this species is non toxic, its proven occurrence in plants will represent a potential detoxification mechanism. Therefore in this study, a method was specifically developed for identification and quantification of elemental selenium. In order to investigate the occurrence of elemental selenium in plants, the newly developed method was applied using Thunbergia alata as a model plant. Arsenic is known to activate the synthesis of PC using glutathione and the complexation of the activating arsenic ions with the synthesised PCs is a well established detoxification mechanism for arsenic. However, very little is known about the role of glutathione and PCs in selenium detoxification. In order to be able to gain better insight into the interaction between selenium and arsenic in plants, the role of glutathione and PCs in selenium metabolism was investigated using Arabidopsis thaliana as a model plant. Sensitivity tests and speciation analysis were carried out on Arabidopsis thaliana WT and the mutants’ one of which is deficient in GSH synthesis and the other deficient in PC synthesis using selenite and arsenate as toxicants. The study revealed that selenium induces the synthesis of glutathione but rather use it as reductant and precursor for transformation and incorporation into peptides and neither GSH nor PCs play any role in selenium detoxification. It…

Subjects/Keywords: 540; Selenium; Arsenic

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APA (6^th Edition):

Aborode, F. A. (2013). Selenium and arsenic speciation in plants. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152527150005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577621

Chicago Manual of Style (16^th Edition):

Aborode, Fatai Adigun. “Selenium and arsenic speciation in plants.” 2013. Doctoral Dissertation, University of Aberdeen. Accessed March 01, 2021. https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152527150005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577621.

MLA Handbook (7^th Edition):

Aborode, Fatai Adigun. “Selenium and arsenic speciation in plants.” 2013. Web. 01 Mar 2021.

Vancouver:

Aborode FA. Selenium and arsenic speciation in plants. [Internet] [Doctoral dissertation]. University of Aberdeen; 2013. [cited 2021 Mar 01]. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152527150005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577621.

Council of Science Editors:

Aborode FA. Selenium and arsenic speciation in plants. [Doctoral Dissertation]. University of Aberdeen; 2013. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152527150005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577621

University of Aberdeen

22. Lomax, Charlotte. Investigating the origin and transport of methylated arsenic species in plants.

Degree: PhD, 2013, University of Aberdeen

URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153025480005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600090

► Inorganic arsenic is a toxic element known to cause various diseases and cancers in humans. Arsenic contamination is widespread worldwide, particularly in South-East Asia where… (more)

Subjects/Keywords: 570; Arsenic; Plants

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APA (6^th Edition):

Lomax, C. (2013). Investigating the origin and transport of methylated arsenic species in plants. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153025480005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600090

Chicago Manual of Style (16^th Edition):

Lomax, Charlotte. “Investigating the origin and transport of methylated arsenic species in plants.” 2013. Doctoral Dissertation, University of Aberdeen. Accessed March 01, 2021. https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153025480005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600090.

MLA Handbook (7^th Edition):

Lomax, Charlotte. “Investigating the origin and transport of methylated arsenic species in plants.” 2013. Web. 01 Mar 2021.

Vancouver:

Lomax C. Investigating the origin and transport of methylated arsenic species in plants. [Internet] [Doctoral dissertation]. University of Aberdeen; 2013. [cited 2021 Mar 01]. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153025480005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600090.

Council of Science Editors:

Lomax C. Investigating the origin and transport of methylated arsenic species in plants. [Doctoral Dissertation]. University of Aberdeen; 2013. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153025480005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600090

Hong Kong University of Science and Technology

23. Yu, Zhigang EVNG. Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater.

Degree: 2018, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-105659 ; https://doi.org/10.14711/thesis-991012637064403412 ; http://repository.ust.hk/ir/bitstream/1783.1-105659/1/th_redirect.html

► Nano zero-valent iron (nZVI) is widely used in the arsenic (As) remediation of groundwater. During the remediation, nZVI reacts with As and then forms As-loaded… (more)

Subjects/Keywords: Groundwater ; Purification ; Arsenic removal ; Technological innovations ; Arsenic content ; Arsenic ; Environmental aspects

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APA (6^th Edition):

Yu, Z. E. (2018). Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-105659 ; https://doi.org/10.14711/thesis-991012637064403412 ; http://repository.ust.hk/ir/bitstream/1783.1-105659/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yu, Zhigang EVNG. “Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater.” 2018. Thesis, Hong Kong University of Science and Technology. Accessed March 01, 2021. http://repository.ust.hk/ir/Record/1783.1-105659 ; https://doi.org/10.14711/thesis-991012637064403412 ; http://repository.ust.hk/ir/bitstream/1783.1-105659/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yu, Zhigang EVNG. “Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater.” 2018. Web. 01 Mar 2021.

Vancouver:

Yu ZE. Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2018. [cited 2021 Mar 01]. Available from: http://repository.ust.hk/ir/Record/1783.1-105659 ; https://doi.org/10.14711/thesis-991012637064403412 ; http://repository.ust.hk/ir/bitstream/1783.1-105659/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yu ZE. Fate and transport of arsenic-loaded nano zero-valent iron (nZVI) in groundwater. [Thesis]. Hong Kong University of Science and Technology; 2018. Available from: http://repository.ust.hk/ir/Record/1783.1-105659 ; https://doi.org/10.14711/thesis-991012637064403412 ; http://repository.ust.hk/ir/bitstream/1783.1-105659/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

24. Sanchez-Palacios, Jose Tonatiuh. Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies.

Degree: 2013, University of Melbourne

URL: http://hdl.handle.net/11343/38289

► The major aim of this study was to investigate the responses of Eucalyptus spp. to arsenic (As). This aim was tackled by determining the speciation… (more)

▼ The major aim of this study was to investigate the responses of Eucalyptus spp. to arsenic (As). This aim was tackled by determining the speciation and localisation of As forms in plants and by measuring the performance of plants under As-rich field conditions. Speciation of As in two Eucalyptus spp. (E. camaldulensis and E. cladocalyx) that are widely used for mineral waste stabilisation was examined using in situ and extraction/fractionation methods. The in situ X-ray absorption spectroscopic analysis indicated that arsenic in roots of both E. camaldulensis and E. cladocalyx was predominantly present (about 95%) as AsIII-tris-thiolate after 60 days of As exposure of plants grown in solution culture. Similarly, in the leaves of both species, As was present mainly as AsIII-tris-thiolate, but the proportion of total As was somewhat lower (about 80%). A small fraction of unbound AsIII in roots of about 5% was detected, whereas in leaves it was about 20%. Fractionation of tissue extracts involving HPLC and mass spectrometry resolved the likely AsIII-tris-thiolate ligands in roots. At least three well known thiolate containing ligands were found, including the phytochelatin AsIII-PC3 complex (m/z 844), and some free thiolate containing species such as oxidised glutathione (GSSH) (m/z 613) and oxidised PC2 (m/z 538). The stability and dissociation of AsIII thiol groups were investigated and measured using the reference material AsIII-tris-GSH. It was found that after the processes of extraction, filtration and chromatographic fractionation, recovery of AsIII-tris-GSH was about 50%, with AsIII accounting for the remaining 50%. Localisation of arsenic in E. camaldulensis and E. cladocalyx under the same conditions was examined. Minimal As transport from root into the stem and leaves (typically <1% of total plant As) confirmed that E. camaldulensis and E. cladocalyx are As excluders. The accumulation of As to relatively high levels (≥ 98%) in the roots showed considerable absolute variation with mean values (± se) of 413 ± 308 µg As g-1 d.w. in E. camaldulensis and 334 ± 200 µg As g-1 d.w. in E. cladocalyx. Similar variability was recorded in leaves: 3.3 ± 1.5 µg As g-1 d.w. and 2 ± 1.4 µg As g-1 d.w. for E. camaldulensis and E. cladoclayx, respectively. The results obtained using in situ imaging micro-PIXE showed that the spatial distribution of As in roots varied between E. camaldulensis and E. cladocalyx. Arsenic showed the highest concentration in the epidermis in E. camaldulensis roots, compared to E. cladocalyx roots which had the highest As concentration in the endodermis. In situ imaging also showed the formation of Fe plaque on the roots of both eucalypts, and Fe also occurred at high concentrations on epidermal and cortical cells and at lower concentrations in vascular bundles. The localisation of Fe in the roots of both Eucalyptus spp. was not strictly associated with As. However, in situ imaging failed to provide information on the precise distribution of As in…

Subjects/Keywords: arsenic; Eucalyptus; arsenic-speciation; arsenic-localisation; plant physiology; phytostabilisation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sanchez-Palacios, J. T. (2013). Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/38289

Chicago Manual of Style (16^th Edition):

Sanchez-Palacios, Jose Tonatiuh. “Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies.” 2013. Doctoral Dissertation, University of Melbourne. Accessed March 01, 2021. http://hdl.handle.net/11343/38289.

MLA Handbook (7^th Edition):

Sanchez-Palacios, Jose Tonatiuh. “Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies.” 2013. Web. 01 Mar 2021.

Vancouver:

Sanchez-Palacios JT. Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies. [Internet] [Doctoral dissertation]. University of Melbourne; 2013. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11343/38289.

Council of Science Editors:

Sanchez-Palacios JT. Responses of Eucalyptus species to arsenic: speciation, localisation and performance studies. [Doctoral Dissertation]. University of Melbourne; 2013. Available from: http://hdl.handle.net/11343/38289

Columbia University

25. Howe, Caitlin Grace. Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics.

Degree: 2016, Columbia University

URL: https://doi.org/10.7916/D8MP53CK

► Background: In Bangladesh, more than 57 million individuals are exposed to arsenic-contaminated drinking water at concentrations that exceed the World Health Organization guideline for safe… (more)

▼ Background: In Bangladesh, more than 57 million individuals are exposed to arsenic-contaminated drinking water at concentrations that exceed the World Health Organization guideline for safe drinking water, which is 10 μg/L. Arsenic is a human carcinogen, which has also been associated with numerous non cancer outcomes, including cardiovascular disease. For many arsenic-related health outcomes, susceptibility differs by sex, with some outcomes preferentially afflicting males and others females. Although reducing exposure to arsenic-contaminated drinking water is the primary strategy for preventing arsenic toxicity, cancer risks remain elevated decades after arsenic exposure has been reduced. Therefore, public health approaches which complement arsenic remediation efforts are needed. One potential set of strategies includes nutritional interventions. Deficiencies in one-carbon metabolism (OCM nutrients can cause hyperhomocysteinemia (HHcys), which has been associated with adverse health outcomes, including cancers and cardiovascular disease. In Bangladesh, the prevalence of HHcys is quite high and differs by sex (63% among men, 26% among women). Nutrients involved in the OCM pathway may also protect against arsenic toxicity. Two potential mechanisms include: 1) by enhancing arsenic metabolism and 2) by preventing/reversing arsenic-induced epigenetic dysregulation. Arsenic metabolism facilitates urinary arsenic elimination and depends on two sequential S-adenosylmethionine (SAM)-dependent methylation steps, which yield the mono- and dimethyl arsenical species (MMA and DMA, respectively and S-adenosylhomocysteine (SAH), a potent inhibitor of most methyltransferases. SAM is synthesized via OCM, a pathway with many nutritional influences, including folate and cobalamin. There is substantial evidence from experimental studies that the OCM pathway is important for facilitating arsenic metabolism and elimination. However, the relationships between SAM, SAH, and arsenic methylation may be particularly complex in populations exposed continuously to arsenic, because 1) the arsenic metabolites compete for methylation, since each methylation step is catalyzed by the arsenic (+3) methyltransferase and requires a methyl group from SAM, and 2) folate and cobalamin nutritional status may vary between individuals. Although the mechanisms mediating arsenic toxicity remain largely unclear and are likely multifactorial, there is increasing evidence that arsenic induces epigenetic dysregulation, including alterations in both DNA methylation and posttranslational histone modifications (PTHMs), and these effects may differ by sex. Arsenic has also been shown to alter gene expression in a sex dependent manner. However, the sex-specific effects of arsenic on PTHMs and gene expression have not been confirmed in a large epidemiological study. Since many of the enzymes involved in epigenetic regulation, including DNA methyltransferases and lysine histone methyltransferases, depend on SAM, epigenetic modifications are also influenced by OCM.…

Subjects/Keywords: Arsenic – Carcinogenicity; Arsenic – Physiological effect; Nutrition – Therapeutic use; Arsenic – Metabolism; Environmental health; Epidemiology; Toxicology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Howe, C. G. (2016). Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8MP53CK

Chicago Manual of Style (16^th Edition):

Howe, Caitlin Grace. “Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics.” 2016. Doctoral Dissertation, Columbia University. Accessed March 01, 2021. https://doi.org/10.7916/D8MP53CK.

MLA Handbook (7^th Edition):

Howe, Caitlin Grace. “Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics.” 2016. Web. 01 Mar 2021.

Vancouver:

Howe CG. Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics. [Internet] [Doctoral dissertation]. Columbia University; 2016. [cited 2021 Mar 01]. Available from: https://doi.org/10.7916/D8MP53CK.

Council of Science Editors:

Howe CG. Nutritional influences on arsenic toxicity in Bangladeshi men and women: interplay between one-carbon metabolism, arsenic, and epigenetics. [Doctoral Dissertation]. Columbia University; 2016. Available from: https://doi.org/10.7916/D8MP53CK

University of Auckland

26. Wilson, Nathaniel James. The behaviour of antimony in geothermal systems and their receiving environments.

Degree: 2009, University of Auckland

URL: http://hdl.handle.net/2292/4230

► Antimony (Sb) is an element of increasing concern as an environmental contaminant. Geothermal systems are a potential source of Sb in the fresh waters of… (more)

▼ Antimony (Sb) is an element of increasing concern as an environmental contaminant. Geothermal systems are a potential source of Sb in the fresh waters of New Zealand???s North Island, but little is known about the element???s behaviour within geothermal fluids, and even less about the eventual fate of geothermally produced Sb. The purpose of this thesis was to determine the factors controlling geothermal Sb behaviour in a range of environments, in order to begin to develop an understanding of the eventual fate of Sb produced from geothermal systems. Factors controlling Sb precipitation at two New Zealand geothermal power stations, were determined using field measurements and geochemical model predictions. Approximately 75 % of the incoming Sb, which ranged from 960 ??? 1650 ??g/kg in the incoming fluids was removed from solution within the Ngawha and Rotokawa power stations. It was found that changes in pH and temperature were the most important factors controlling stibnite (Sb2S3) precipitation. Thermodynamic databases could be used to model this precipitation process, once updated with recent published Sb2S3 solubility data. The mobility of Sb from Sb2S3 precipitates in geothermal features at Wai-O-Tapu and Waimangu, two New Zealand geothermal fields, were investigated. At Wai-O-Tapu, daytime variations in aqueous Sb concentrations from the discharge of Champagne Pool may be due to to changing sulfide-sulfate equilibria coupled with photosynthetic bacterial processes. While daytime concentrations of Sb approached 200 ??g/kg, most of the Sb remobilised by such mechanisms appears to be removed by adsorption onto suspended particulate material (SPM) or reprecipitation (as Sb2S3) in an anoxic, low pH lake feature downstream. Concentrations of Sb in the discharge from Alum Lake were below the analytical detection limit (<0.2 ??g/kg). At Waimangu, these daytime fluctuations were not observed in the discharge of Frying Pan Lake, and concentrations of Sb were ~13 ??g/kg. In the absence of any downstream acidic waters, no precipitation was observed and only minor adsorption onto SPM was observed. Most of the Sb produced from Frying Pan Lake is therefore transported into Lake Rotomahana, the system???s receiving environment. Natural Sb removal processes in receiving (non-geothermal) environments were also assessed. In the Waikato River, Sb concentrations were low (~1 ??g/kg), compared to those observed in geothermal environments studied. The most important process was adsorption to SPM, which is enhanced at low (< 5) pH conditions, or in the anoxic base of stratified lakes. In Lake Ohakuri, which was stratified during the summer of 2007, there was also the potential for the removal of Sb as Sb2S3 in the presence of sulfide species that form in the anoxic layer. There was evidence that the adsorption of Sb changes with changing Fe concentrations in suspended particulate material, and therefore Sb adsorption was higher in winter than in summer. The behaviour of Sb was conservative in the Port Waikato estuary… Advisors/Committee Members: Jenny Webster-Brown, Kevin Brown.

Subjects/Keywords: antimony; geothermal; environmental chemistry; arsenic

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APA (6^th Edition):

Wilson, N. J. (2009). The behaviour of antimony in geothermal systems and their receiving environments. (Doctoral Dissertation). University of Auckland. Retrieved from http://hdl.handle.net/2292/4230

Chicago Manual of Style (16^th Edition):

Wilson, Nathaniel James. “The behaviour of antimony in geothermal systems and their receiving environments.” 2009. Doctoral Dissertation, University of Auckland. Accessed March 01, 2021. http://hdl.handle.net/2292/4230.

MLA Handbook (7^th Edition):

Wilson, Nathaniel James. “The behaviour of antimony in geothermal systems and their receiving environments.” 2009. Web. 01 Mar 2021.

Vancouver:

Wilson NJ. The behaviour of antimony in geothermal systems and their receiving environments. [Internet] [Doctoral dissertation]. University of Auckland; 2009. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/2292/4230.

Council of Science Editors:

Wilson NJ. The behaviour of antimony in geothermal systems and their receiving environments. [Doctoral Dissertation]. University of Auckland; 2009. Available from: http://hdl.handle.net/2292/4230

NSYSU

27. Liu, Yin-hsiao. Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS.

Degree: Master, Chemistry, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622114-215059

► In the first study, speciation of arsenic in seaweeds was carried out using ion chromatography (IC) for separation and inductively coupled mass spectrometry (ICP-MS) for… (more)

▼ In the first study, speciation of arsenic in seaweeds was carried out using ion chromatography (IC) for separation and inductively coupled mass spectrometry (ICP-MS) for detection. The arsenic species studied were arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), arsenobeta- ine (AsB), arsenocholine (AsC), OH-arsenoribose (OH-AsR), PO4-arsenoribose (PO4- AsR) , SO3H-arsenoribose (SO3H - AsR), and trialkylarsonioribosides (Trialkyl-AsR). Chromatographic separation of all the species was achieved in <19 min in gradient elution mode using (NH4)2CO3 at pH 8.7. Since there was not standard of arsenosugar, in the experiment used extraction of Laminaria japonica Areschoug spiked [As(III)], [As(V)], MMA, DMA, AsB, AsC. The outlet of the IC column was directly connected to the nebulizer of ICP-MS for the determination of arsenic. The speciation of arsenic has been carried out in several seaweed samples. A microwave-assisted extraction method was used for the extraction of arsenic species from seaweed samples. With a mixture of mobile phase A and methanol as extractant, the extraction efficiency was >73%, and the recoveries from spiked samples were in the range of 93â109%. The unknown compounds detected in different seaweeds were identified by coupling IC directly with electrospray ionizationâmass spectrometry (ESI-MS). Four arsenosugars and tetramethylarsonium ion (TMA) were identified in different seaweeds. A fat- soluble arsenolipid compound was identified in the extract of certified reference material BCR-279 Ulva lactuca when 1% HNO3 was used as the extractant. Second study, A HPLC separation procedure has been developed for the specia- tion of Cr(III), Cr(VI) in wine and diabetic supplement drinks samples. The species were separated on a reversed phase column (C8) in gradient elution mode. The mobile phase consisting of EDTA and TBAP in methanol at pH 6.9, yielded well resolved chromatograms of all the species within 2 min. The analyses were carried out using dynamic reaction cell inductively coupled plasma-mass spectrometer (DRC-ICP-MS). The DRC conditions have also been optimized to obtained interference free measure- ments of 52Cr+ and 53Cr+, which were otherwise interfered by: 35Cl16O1H+, 35Cl17O+, 40Ar12C+ on 52Cr+; and 37Cl16O+, 40Ar13C+, 40Ar12C1H+ on 53Cr+. The detection limits of the procedure were 0.052 ng 52Cr ml-1 and 0.054 ng 53Cr ml-1. The accuracy of the method has been validated by comparing the sum of the concentrations obtained for individual species with total concentration of the elements in NRCC SLRS-4 River Water. The method has also been applied on several real samples, included environmental water, wine and supplement drinks, in which case the comparison total chromium concentration. Supplement drinks has been made with total concentrations determined after complete dissolution of the samples. The species were separated by HPLC-DRC-ICP-MS in appropriate dilute. Advisors/Committee Members: Shiuh-Jen Jiang (committee member), Yen-Ling Chen (chair), Shou-Mei Wu (chair).

Subjects/Keywords: Chromium; Arsenic; HPLC; ICP-MS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, Y. (2014). Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622114-215059

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Yin-hsiao. “Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS.” 2014. Thesis, NSYSU. Accessed March 01, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622114-215059.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Yin-hsiao. “Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS.” 2014. Web. 01 Mar 2021.

Vancouver:

Liu Y. Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Mar 01]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622114-215059.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu Y. Determination of arsenic species in seaweeds and chromium species by HPLC-ICP-MS. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0622114-215059

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Technical University of Lisbon

28. Carvalho, João da Cruz. Dinâmica do arsénio no sistema solo-água-arroz.

Degree: 2013, Technical University of Lisbon

URL: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/6704

►

Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia

Paddy rice (Oryza sativa L.) is a staple food consumed worldwide especially in Asia and one… (more)

Subjects/Keywords: paddy rice; arsenic; biogeochemistry; cytogenetics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Carvalho, J. d. C. (2013). Dinâmica do arsénio no sistema solo-água-arroz. (Thesis). Technical University of Lisbon. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/6704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Carvalho, João da Cruz. “Dinâmica do arsénio no sistema solo-água-arroz.” 2013. Thesis, Technical University of Lisbon. Accessed March 01, 2021. https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/6704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Carvalho, João da Cruz. “Dinâmica do arsénio no sistema solo-água-arroz.” 2013. Web. 01 Mar 2021.

Vancouver:

Carvalho JdC. Dinâmica do arsénio no sistema solo-água-arroz. [Internet] [Thesis]. Technical University of Lisbon; 2013. [cited 2021 Mar 01]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/6704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Carvalho JdC. Dinâmica do arsénio no sistema solo-água-arroz. [Thesis]. Technical University of Lisbon; 2013. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/6704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Ryerson University

29. Yogarajah, Nevetha. Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry.

Degree: 2016, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A5129

► Ultrasound imaging based on transmitting plane waves (PW) enables ultrafast imaging. Coherent PW compounding ultrasound imaging can reach the image quality of optimal multifocus image.… (more)

Subjects/Keywords: Arsenic – Environmental aspects; Molybdenum compounds

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yogarajah, N. (2016). Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A5129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yogarajah, Nevetha. “Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry.” 2016. Thesis, Ryerson University. Accessed March 01, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A5129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yogarajah, Nevetha. “Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry.” 2016. Web. 01 Mar 2021.

Vancouver:

Yogarajah N. Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry. [Internet] [Thesis]. Ryerson University; 2016. [cited 2021 Mar 01]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yogarajah N. Development of a simple, portable, colorimetric arsenic sensor based on Molybdenum Blue Chemistry. [Thesis]. Ryerson University; 2016. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rochester Institute of Technology

30. Herder, Laura. Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water.

Degree: School of Chemistry and Materials Science (COS), 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5973

► Arsenic contamination of groundwater is a major problem in both developing and developed countries as it is quite dangerous at extremely low concentrations and prevalent… (more)

▼ Arsenic contamination of groundwater is a major problem in both developing and developed countries as it is quite dangerous at extremely low concentrations and prevalent in many water supplies. Although there are many removal techniques for arsenic, the most promising for developing countries appears to be adsorption, since it is relatively low in cost, is easy to implement, requires no electricity, and can remove trace amounts of materials from solutions. Current adsorbents that have a high affinity for arsenic, but are costly because they have slow adsorption rates, low capacities, limited pH ranges, are affected adversely by competing ions, and often cannot be regenerated. One of the most successful adsorbent materials for arsenic removal is cerium dioxide, but unfortunately, this compound is quite expensive because of its rare earth component, cerium. Previous studies have utilized pure cerium dioxide adsorbents for adsorption. However, it is possible that some of the cerium dioxide may not be accessible to adsorption as a portion of this valuable chemical resides inside the particle itself. This study examines the efficacy of a new adsorbent synthesized such that cerium dioxide nanoparticles are coated over an alumina substrate in an attempt to reduce cost and improve adsorption efficiency. It is found that the coated alumina has fast adsorption rates (95% removed in 5 minutes), is effective over a large pH range, and also preferentially adsorbs arsenic even when other chemicals commonly found in groundwater, such as phosphates, are present. These results are comparable to those of pure cerium dioxide adsorbents and cerium dioxide coated carbon nanotubes used in previous studies. However, the adsorption capacity of the new adsorbent for arsenic is much lower than that for pure cerium dioxide nanoparticles. These results suggest that the effect of new environmental conditions on the efficacy of pure cerium dioxide as an adsorbent may be studied more cost effectively using the cerium dioxide coated alumina as a model system. Advisors/Committee Members: Langner, Andreas.

Subjects/Keywords: Adsorbent; Arsenic; Cerium dioxide

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Herder, L. (2011). Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5973

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Herder, Laura. “Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water.” 2011. Thesis, Rochester Institute of Technology. Accessed March 01, 2021. https://scholarworks.rit.edu/theses/5973.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Herder, Laura. “Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water.” 2011. Web. 01 Mar 2021.

Vancouver:

Herder L. Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Mar 01]. Available from: https://scholarworks.rit.edu/theses/5973.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Herder L. Development of cerium dioxide coated alumina adsorbent to study the removal of arsenic from ground water. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/5973

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations