subject:(Nitric acid)

University of Sydney

1. Lee, Jessy Ju Lian. Process intensification of nitrous gas absorption .

Degree: 2012, University of Sydney

► The absorption of nitrogen oxides in water has important applications in nitric acid manufacture and pollution control. The design for optimum absorption efficiency and air… (more)

▼ The absorption of nitrogen oxides in water has important applications in nitric acid manufacture and pollution control. The design for optimum absorption efficiency and air pollution control has made necessary the installation of large reaction chambers and absorption towers for the adequate oxidation and absorption of nitrous gases. The worldwide production of weak acid has seen the progression of the process from the use of low through medium- to high-pressure technology in the efforts of achieving a more compact construction and avoiding the need for catalytic tail-gas treatment in plants with ever increasing capacities. Even at high pressures (8 bar), absorption columns employing sieve plates can reach up to 40 m in height for large-tonnage plants, and the relatively large pressure drop across the plates at these pressures leads to high power consumption and increased costs. As the dimensions of the absorption tower are typically governed by the conditions required for NO oxidation and thermal design, intensification of the process via miniaturisation can address the issues above through the high surface area to volume ratio offered by microreactor technology. The substantial improvement in heat and mass transfer due to the increase in effective exchange surface leads to an acceleration of the slow NO oxidation reaction and the enhancement of absorption rates. In addition to the development of such novel equipment for process intensification, the flow of the process can also be structured to improve process efficiency. An interesting method would be the replacement of the nitrogen ballast typically used in industry with steam, as the concentration of the gases upon condensation can lead to improved gas phase reaction rates. Furthermore, the provision of increased residence times due to the decrease in gas velocity upon condensation also makes the process more efficient. In this way, the size of the absorber can be significantly reduced and the high capital and operating costs associated with the employment of compressors in high pressure plants can be reduced. The objective of this thesis is to gain a fundamental understanding of the complex behaviour of nitric acid production in microchannels and obtain data for the development of a model used for process design and optimisation. Experiments on the oxidation and absorption of xviii nitrogen oxides have been conducted for a wide range of nominal residence times (0.03 – 1.4 s), gas compositions (5 – 10% NO, 5 – 49% O2, 46 – 82% H2O, balance argon), system pressures (2 – 10 bar absolute), mass fluxes (1.5 – 30 kg m-2 s-1), coolant mass fluxes (66 kg m-2 s-1 and 341 kg m-2 s-1), and coolant temperatures (23 – 51ºC) in circular tubes with internal diameters of 1.4 and 3.9 mm. Absorption efficiencies of up to 99% have been achieved without the use of counter-current flow typically employed in conventional nitric acid plants. The use high steam fractions was shown to cause significant improvements in gas phase reaction rates such that the usual industrial practice of…

Subjects/Keywords: Nitric acid; Nitrogen oxides

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lee, J. J. L. (2012). Process intensification of nitrous gas absorption . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/15618

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):

Lee, Jessy Ju Lian. “Process intensification of nitrous gas absorption .” 2012. Thesis, University of Sydney. Accessed January 19, 2021. http://hdl.handle.net/2123/15618.

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

MLA Handbook (7^th Edition):

Lee, Jessy Ju Lian. “Process intensification of nitrous gas absorption .” 2012. Web. 19 Jan 2021.

Vancouver:

Lee JJL. Process intensification of nitrous gas absorption . [Internet] [Thesis]. University of Sydney; 2012. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2123/15618.

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

Council of Science Editors:

Lee JJL. Process intensification of nitrous gas absorption . [Thesis]. University of Sydney; 2012. Available from: http://hdl.handle.net/2123/15618

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

2. Trownson, Glenn William. The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313538

► Currently in the UK, spent nuclear fuel is reprocessed using the PUREX (Plutonium Uranium Reduction Extraction) process. This process generates large amounts of aqueous nitric… (more)

▼ Currently in the UK, spent nuclear fuel is reprocessed using the PUREX (Plutonium Uranium Reduction Extraction) process. This process generates large amounts of aqueous nitric acid based waste which is reduced in volume by evaporation before being stored in stainless steel tanks pending eventual disposal to a repository after conversion into a solid wasteform. The corrosivity of nitric acid solutions towards these stainless steel storage tanks is strongly affected by the presence of oxidants that can form in situ if certain dissolved metals such as cerium, chromium, ruthenium and neptunium are present, which is invariably the case in nuclear reprocessing plant liquors. Such liquors are, however, subject to radiolysis leading to the formation of nitrous acid and NOx species in equilibrium with nitric acid and water. The redox chemistry of irradiated reprocessing plant liquors is therefore complex, depending on a large number of factors including acidity, nitrate ion concentration, temperature, pressure, radiation dose rate and the nature/concentration of dissolved species. High acidities, high temperatures and low dose rates favour the oxidation of species such as Ce(III). For example, when Ce(IV) forms, the corrosion rate of stainless steel is strongly increased since the reduction of Ce(IV) forms a kinetically-favoured path way. Furthermore, the presence of nitrous acid (which is radiolytically formed from nitrate/nitric acid) can act to reduce potential corrosion accelerators (e.g. Ce(IV)) to their non-oxidising valency states. These dependencies are only semi-quantitatively understood at present, hampering useful prediction of actual effects when conditions are changed. The research presented within this thesis is divided between two experimental campaigns which are interrelated by their applicability to highly active storage tank conditions; I. An investigation into the conditions which effect the radiolytic production of nitrous acid in nitric acid based solutions was undertaken. This included the quantitative measurement of the steady state concentration of nitrous acid experienced under different conditions. The conditions investigated include temperature, dose rate, gaseous headspace and liquor composition in order to elucidate which factors are of importance in estimating the concentration of nitrous acid which can be expected at the base of a highly active storage tank. The major result of this campaign was that nitrous acid data collected could be used to formulate a g-value of nitrous acid formation (which was found to be 0.71) and this value was used to calculate the nitrous acid production rate expected within a highly active storage tank which is a pre-requisite of underpinning the corrosion chemistry within. II. Investigation into the potential formation of in situ corrosion accelerators in a reprocessing liquor simulant was undertaken. For this, a bespoke experimental rig has been designed, built and operated in order to identify the valency of potential corrosion accelerators at high temperatures… Advisors/Committee Members: Pimblott, Simon.

Subjects/Keywords: Corrosion; Nitric acid; Reprocessing; Nitrous acid; Cerium

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Trownson, G. W. (2018). The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313538

Chicago Manual of Style (16^th Edition):

Trownson, Glenn William. “The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions.” 2018. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313538.

MLA Handbook (7^th Edition):

Trownson, Glenn William. “The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions.” 2018. Web. 19 Jan 2021.

Vancouver:

Trownson GW. The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Jan 19]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313538.

Council of Science Editors:

Trownson GW. The High Temperature Corrosivity of Radiolysed Nitric Acid Solutions. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313538

3. Munro, Hannah Ruth. AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES.

Degree: MS, 2019, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1303

► The Western wildfire Experient for Cloud chemistry, Aerosol absorption, and Nitrogen (WE-CAN), an NSF funded multi-platform campaign, launched with the goal of expanding scientific… (more)

Subjects/Keywords: Nitric Acid; Nitrous Acid; Reactive Nirtogen

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Munro, H. R. (2019). AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1303

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):

Munro, Hannah Ruth. “AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES.” 2019. Thesis, University of New Hampshire. Accessed January 19, 2021. https://scholars.unh.edu/thesis/1303.

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

MLA Handbook (7^th Edition):

Munro, Hannah Ruth. “AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES.” 2019. Web. 19 Jan 2021.

Vancouver:

Munro HR. AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES. [Internet] [Thesis]. University of New Hampshire; 2019. [cited 2021 Jan 19]. Available from: https://scholars.unh.edu/thesis/1303.

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

Council of Science Editors:

Munro HR. AN INVESTIGATION OF NITROUS AND NITRIC ACID DIURNAL CYCLES IN BIOMASS BURNING PLUMES. [Thesis]. University of New Hampshire; 2019. Available from: https://scholars.unh.edu/thesis/1303

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

University of Manchester

4. Jones, Benjamin. Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:297387

►

Formic acid and nitric acid have been found to contribute to aerosol formation and are key components of acidity in the troposphere. Tropospheric measurements of… (more)

▼

Formic acid and nitric acid have been found to contribute to aerosol formation and are key components of acidity in the troposphere. Tropospheric measurements of these species are often limited, resulting in major uncertainties when assessing their effects on the climate. Current global chemistry-transport models significantly under-predict formic acid concentrations, particularly in the mid-to-high latitudes of the Northern Hemisphere. Furthermore, large discrepancies exist in the role played by dinitrogen pentoxide on nitric acid production between two recently documented models assessing the global nitric acid budget. In order to accurately constrain the budget of these acids in the mid-to-high latitudes of the Northern Hemisphere, it is crucial that these uncertainties are addressed. In this work, airborne measurements of formic acid, nitric acid and dinitrogen pentoxide are presented from across different regions of the Northern Hemisphere to investigate direct and indirect sources contributing to the formic acid and nitric acid regional budgets. Measurements were collected using a Chemical Ionisation Mass Spectrometer (CIMS) fitted to the Facility for Atmospheric Airborne Measurements (FAAM) BAe-146 aircraft. Formic acid measurements within the European Arctic during March and July 2012 would indicate ocean sources dominate over terrestrial sources irrespective of seasonality. CH2I2 photolysis and oxidation was hypothesised as a marine source of formic acid. Modelled estimates would indicate the CH2I2 reaction route may represent a significant summer marine source of formic acid within the Fenno-Scandinavian Arctic. Additionally, low altitude aircraft measurements taken within the Fenno-Scandinavian Arctic over regions occupied by wetlands in August 2013 were used to calculate a formic acid surface flux. Results would suggest formic acid emission from wetlands may represent up to 37 times greater than its globally inferred estimate. A flux measurement conducted over a comparable region in September 2013 observed a negative flux, indicating a change of this region from a net source to a net sink of formic acid. The inconsistency of this regional wetland source confirms the need for in-depth studies on formic acid emission from wetlands, in order to better understand its contribution to the regional and global formic acid budget. In a separate study, significant daytime elevations of N2O5 and HNO3 concentrations were observed within identified biomass burning plumes off the eastern coast of Canada. In-plume correlations between N2O5 and HNO3 concentrations observed within these environments suggest N2O5 was acting as additional daytime source of gaseous HNO3 when subjected to photolytically-limited conditions. This result has important implications to ozone production and provides evidence for an additional daytime source of nitric acid, which must be included in chemistry models calculating the global nitric acid budget.

N/A

Advisors/Committee Members: COE, HUGH H, Coe, Hugh, Percival, Carl.

Subjects/Keywords: Formic Acid; Nitric Acid; Dinitrogen Pentoxide; CIMS

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jones, B. (2016). Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:297387

Chicago Manual of Style (16^th Edition):

Jones, Benjamin. “Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).” 2016. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:297387.

MLA Handbook (7^th Edition):

Jones, Benjamin. “Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).” 2016. Web. 19 Jan 2021.

Vancouver:

Jones B. Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Jan 19]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:297387.

Council of Science Editors:

Jones B. Airborne Measurements of Organic acids, Inorganic acids and other Trace Gas Species in the Remote Regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:297387

The Ohio State University

5. Sanghvi, Manoj Kumar Dalichand. A study of the volumetric properties and thermal stability of concentrated nitric acid.

Degree: PhD, Graduate School, 1956, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu148639397731777

Subjects/Keywords: Engineering; Nitric acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sanghvi, M. K. D. (1956). A study of the volumetric properties and thermal stability of concentrated nitric acid. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu148639397731777

Chicago Manual of Style (16^th Edition):

Sanghvi, Manoj Kumar Dalichand. “A study of the volumetric properties and thermal stability of concentrated nitric acid.” 1956. Doctoral Dissertation, The Ohio State University. Accessed January 19, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu148639397731777.

MLA Handbook (7^th Edition):

Sanghvi, Manoj Kumar Dalichand. “A study of the volumetric properties and thermal stability of concentrated nitric acid.” 1956. Web. 19 Jan 2021.

Vancouver:

Sanghvi MKD. A study of the volumetric properties and thermal stability of concentrated nitric acid. [Internet] [Doctoral dissertation]. The Ohio State University; 1956. [cited 2021 Jan 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu148639397731777.

Council of Science Editors:

Sanghvi MKD. A study of the volumetric properties and thermal stability of concentrated nitric acid. [Doctoral Dissertation]. The Ohio State University; 1956. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu148639397731777

Michigan State University

6. Stoner, Penny Jean. A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions.

Degree: MS, Dept. of Chemistry, 1967, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:12295

Subjects/Keywords: Ions; Nitric acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Stoner, P. J. (1967). A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:12295

Chicago Manual of Style (16^th Edition):

Stoner, Penny Jean. “A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions.” 1967. Masters Thesis, Michigan State University. Accessed January 19, 2021. http://etd.lib.msu.edu/islandora/object/etd:12295.

MLA Handbook (7^th Edition):

Stoner, Penny Jean. “A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions.” 1967. Web. 19 Jan 2021.

Vancouver:

Stoner PJ. A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions. [Internet] [Masters thesis]. Michigan State University; 1967. [cited 2021 Jan 19]. Available from: http://etd.lib.msu.edu/islandora/object/etd:12295.

Council of Science Editors:

Stoner PJ. A kinetic study of the Thallium (III)-Tris-(1, 10-phenanthroline) iron (II) ion reaction in nitric acid solutions. [Masters Thesis]. Michigan State University; 1967. Available from: http://etd.lib.msu.edu/islandora/object/etd:12295

University of Colorado

7. Maron, Marta Katarzyna. Research in Physical Chemistry and Chemical Education.

Degree: PhD, Chemistry & Biochemistry, 2011, University of Colorado

URL: https://scholar.colorado.edu/chem_gradetds/44

► This dissertation is a combination of two research areas, experimental physical chemistry, Chapters I to V, and chemical education, Chapters VI to VII. Chapters… (more)

▼ This dissertation is a combination of two research areas, experimental physical chemistry, Chapters I to V, and chemical education, Chapters VI to VII. Chapters I to V describe research on the water-mediated chemistry of oxidized atmospheric molecules and the impact that water has on the spectra of these environmental systems. The role of water in the Earth's atmosphere has been of considerable interest due to its ability to impact chemistry and climate. Oxidized atmospheric molecules in the presence of water have the ability to form hydrogen bonded water complexes. The spectroscopic investigation of nitric acid-water complexes, outlined in Chapter III, was undertaken to characterize intermolecular hydrogen bonds in a water restricted environment at ambient temperatures. Additionally, this characterization of nitric acid-water complexes allowed for the comparison of calculated overtone OH-stretching vibrational band frequencies, intensities, and anharmonicities of intermolecular hydrogen-bonded water complexes with experimental observations. Oxidized organic molecules, such as aldehydes and ketones, in addition to forming hydrogen-bonded water complexes can undergo a hydration reaction of the carbonyl group and form germinal diols in the presence of water. This chemistry has been studied extensively in bulk aqueous media, however little is known about this process in the gas-phase at low water concentrations. The focus of the studies outlined in Chapters IV and V is motivated by the ability of pyruvic acid and formaldehyde to form germinal diols and water complexes in water-restricted environment. This water-mediated chemistry changes the physical and chemical properties of these organic molecules, therefore, impacting the partitioning between gas and particle phase, as well as the chemistry and photochemistry of oxidized organic molecules in the Earth's atmosphere. The results presented in this dissertation may help resolve the significant discrepancy between atmospherically measured oxidized organic molecules and predictions of atmospheric models at different relative humidities. The chemical education portion of this manuscript presented in Chapters VI and VII, includes the development of a survey to determine how effective a laboratory experiment is in contributing to students' understanding of fundamental chemistry. The specific example used is an electrochemical cell. Our initial results showed that while most of our students could answer quantitative questions about the operation of the cell, their conceptual understanding of the microscopic processes that occur within the cell was inconsistent with the material presented in class. In particular, we noticed that while many students were able to correctly describe the events that take place at the surface of the anode and cathode, their understanding of the events that take place at the salt bridge was lacking. In this investigation, we were able to confirm the misconceptions reported in previous studies. Our results suggest that a relatively modest,… Advisors/Committee Members: Veronica Vaida, Robert Parson, Barney Ellison.

Subjects/Keywords: electrochemistry; formaldehyde; nitric acid; pyruvic acid; student misconceptions; water complexes; Chemistry

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Maron, M. K. (2011). Research in Physical Chemistry and Chemical Education. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/chem_gradetds/44

Chicago Manual of Style (16^th Edition):

Maron, Marta Katarzyna. “Research in Physical Chemistry and Chemical Education.” 2011. Doctoral Dissertation, University of Colorado. Accessed January 19, 2021. https://scholar.colorado.edu/chem_gradetds/44.

MLA Handbook (7^th Edition):

Maron, Marta Katarzyna. “Research in Physical Chemistry and Chemical Education.” 2011. Web. 19 Jan 2021.

Vancouver:

Maron MK. Research in Physical Chemistry and Chemical Education. [Internet] [Doctoral dissertation]. University of Colorado; 2011. [cited 2021 Jan 19]. Available from: https://scholar.colorado.edu/chem_gradetds/44.

Council of Science Editors:

Maron MK. Research in Physical Chemistry and Chemical Education. [Doctoral Dissertation]. University of Colorado; 2011. Available from: https://scholar.colorado.edu/chem_gradetds/44

University of Manchester

8. Trownson, Glenn. The high temperature corrosivity of radiolysed nitric acid solutions.

Degree: PhD, 2018, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740380

► Currently in the UK, spent nuclear fuel is reprocessed using the PUREX (Plutonium Uranium Reduction Extraction) process. This process generates large amounts of aqueous nitric… (more)

▼ Currently in the UK, spent nuclear fuel is reprocessed using the PUREX (Plutonium Uranium Reduction Extraction) process. This process generates large amounts of aqueous nitric acid based waste which is reduced in volume by evaporation before being stored in stainless steel tanks pending eventual disposal to a repository after conversion into a solid wasteform. The corrosivity of nitric acid solutions towards these stainless steel storage tanks is strongly affected by the presence of oxidants that can form in situ if certain dissolved metals such as cerium, chromium, ruthenium and neptunium are present, which is invariably the case in nuclear reprocessing plant liquors. Such liquors are, however, subject to radiolysis leading to the formation of nitrous acid and NOx species in equilibrium with nitric acid and water. The redox chemistry of irradiated reprocessing plant liquors is therefore complex, depending on a large number of factors including acidity, nitrate ion concentration, temperature, pressure, radiation dose rate and the nature/concentration of dissolved species. High acidities, high temperatures and low dose rates favour the oxidation of species such as Ce(III). For example, when Ce(IV) forms, the corrosion rate of stainless steel is strongly increased since the reduction of Ce(IV) forms a kinetically-favoured path way. Furthermore, the presence of nitrous acid (which is radiolytically formed from nitrate/nitric acid) can act to reduce potential corrosion accelerators (e.g. Ce(IV)) to their non-oxidising valency states. These dependencies are only semi-quantitatively understood at present, hampering useful prediction of actual effects when conditions are changed. The research presented within this thesis is divided between two experimental campaigns which are interrelated by their applicability to highly active storage tank conditions; I. An investigation into the conditions which effect the radiolytic production of nitrous acid in nitric acid based solutions was undertaken. This included the quantitative measurement of the steady state concentration of nitrous acid experienced under different conditions. The conditions investigated include temperature, dose rate, gaseous headspace and liquor composition in order to elucidate which factors are of importance in estimating the concentration of nitrous acid which can be expected at the base of a highly active storage tank. The major result of this campaign was that nitrous acid data collected could be used to formulate a g-value of nitrous acid formation (which was found to be 0.71) and this value was used to calculate the nitrous acid production rate expected within a highly active storage tank which is a pre-requisite of underpinning the corrosion chemistry within. II. Investigation into the potential formation of in situ corrosion accelerators in a reprocessing liquor simulant was undertaken. For this, a bespoke experimental rig has been designed, built and operated in order to identify the valency of potential corrosion accelerators at high temperatures…

Subjects/Keywords: 540; Cerium; Reprocessing; Nitrous acid; Corrosion; Nitric acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Trownson, G. (2018). The high temperature corrosivity of radiolysed nitric acid solutions. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740380

Chicago Manual of Style (16^th Edition):

Trownson, Glenn. “The high temperature corrosivity of radiolysed nitric acid solutions.” 2018. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740380.

MLA Handbook (7^th Edition):

Trownson, Glenn. “The high temperature corrosivity of radiolysed nitric acid solutions.” 2018. Web. 19 Jan 2021.

Vancouver:

Trownson G. The high temperature corrosivity of radiolysed nitric acid solutions. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Jan 19]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740380.

Council of Science Editors:

Trownson G. The high temperature corrosivity of radiolysed nitric acid solutions. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-high-temperature-corrosivity-of-radiolysed-nitric-acid-solutions(56c0514a-718b-4bc6-9cf5-e3b968acf715).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740380

University of Manchester

9. Jones, Benjamin. Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).

Degree: PhD, 2016, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-organic-acids-inorganic-acids-and-other-trace-gas-species-in-the-remote-regions-of-the-northern-hemisphere-using-a-chemical-ionisation-mass-spectrometer-cims(b67b7cf5-3ca1-4aaf-ab41-66c2b41c4a2f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728137

► Formic acid and nitric acid have been found to contribute to aerosol formation and are key components of acidity in the troposphere. Tropospheric measurements of… (more)

Subjects/Keywords: 551.51; CIMS; Dinitrogen Pentoxide; Formic Acid; Nitric Acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jones, B. (2016). Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-organic-acids-inorganic-acids-and-other-trace-gas-species-in-the-remote-regions-of-the-northern-hemisphere-using-a-chemical-ionisation-mass-spectrometer-cims(b67b7cf5-3ca1-4aaf-ab41-66c2b41c4a2f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728137

Chicago Manual of Style (16^th Edition):

Jones, Benjamin. “Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).” 2016. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-organic-acids-inorganic-acids-and-other-trace-gas-species-in-the-remote-regions-of-the-northern-hemisphere-using-a-chemical-ionisation-mass-spectrometer-cims(b67b7cf5-3ca1-4aaf-ab41-66c2b41c4a2f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728137.

MLA Handbook (7^th Edition):

Jones, Benjamin. “Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS).” 2016. Web. 19 Jan 2021.

Vancouver:

Jones B. Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Jan 19]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-organic-acids-inorganic-acids-and-other-trace-gas-species-in-the-remote-regions-of-the-northern-hemisphere-using-a-chemical-ionisation-mass-spectrometer-cims(b67b7cf5-3ca1-4aaf-ab41-66c2b41c4a2f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728137.

Council of Science Editors:

Jones B. Airborne measurements of organic acids, inorganic acids and other trace gas species in the remote regions of the Northern Hemisphere using a Chemical Ionisation Mass Spectrometer (CIMS). [Doctoral Dissertation]. University of Manchester; 2016. Available from: https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-organic-acids-inorganic-acids-and-other-trace-gas-species-in-the-remote-regions-of-the-northern-hemisphere-using-a-chemical-ionisation-mass-spectrometer-cims(b67b7cf5-3ca1-4aaf-ab41-66c2b41c4a2f).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728137

10. Mioto, Paulo Tamaso. Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae).

Degree: Mestrado, Botânica, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-11072012-094636/ ;

► Guzmania monostachia é uma bromélia tanque epífita C3-CAM facultativa, constituindo-se em um modelo muito interessante para estudar a sinalização que ocorre na transição da fotossíntese… (more)

▼ Guzmania monostachia é uma bromélia tanque epífita C3-CAM facultativa, constituindo-se em um modelo muito interessante para estudar a sinalização que ocorre na transição da fotossíntese C3 para CAM. Baseado em resultados obtidos pelo Laboratório de Fisiologia Vegetal do IBUSP, constatou-se que a mudança em questão se dá de forma diferente ao longo do comprimento das folhas dessa espécie, sendo muito mais pronunciada na região apical do que na basal. Outra pesquisa, desenvolvida anteriormente no mesmo laboratório, sugere fortemente que na indução ao CAM, em plantas jovens de abacaxizeiro C3, o óxido nítrico (NO) e o ácido abscísico (ABA) atuam como mediadores dessa resposta. Levando em conta esses fatos, o presente trabalho visou caracterizar a participação do NO e do ABA como sinalizadores do CAM em uma bromélia que é reconhecidamente C3-CAM facultativa na natureza. Além disso, suas folhas apresentam diferentes níveis de expressão do CAM ao longo do comprimento, podendo, assim, constituir-se em um ótimo modelo para estudos de sinalização. Também se buscou, nesta pesquisa,saber se seria possível reduzir o modelo de estudo para folhas destacadas, não necessitando empregar a planta inteira nos experimentais. Após a comparação da fotossíntese entre folhas pertencentes a plantas inteiras e folhas destacadas, concluiu-se que é viável trabalhar com as folhas isoladas.Essas foram induzidas ao CAM por déficit hídrico, proporcionado por uma solução de polietilenoglicol (PEG) na concentração de 30%. O acúmulo noturno de acidez e a atividade das enzimas fosfoenolpiruvato carboxilase (PEPC) e malato desidrogenase (MDH) em três porções foliares (porção basal, mediana e apical) foram usadas para caracterizar o grau de expressão do CAM. O conteúdo d\'água (expresso em porcentagem)foi usado como um indicativo da perda d\'água pelo tecido foliar.A participação do NO no processo de indução ao CAM foi avaliado por meio de dosagens por quimioluminescência, espectrofluorimetria e localização in situ por microscopia de fluorescência. Também foi usado um doador desse radical livre, o nitroprissiato de sódio (SNP). O ABA foi quantificado pela técnica de cromatografia a gás acoplada a espectrômetro de massas (GC-MS). As folhas mudaram seu metabolismo fotossintético de C3 para CAM no sexto dia de incubação com PEG (segundo o acúmulo noturno de ácidos e a atividade da enzima PEPC), mas a primeira queda detectável no teor d\'água ocorreu logo nas 12 primeiras horas, aumentando até 24ª hora. Nos dias seguintes (até o 7º), o menor teor de água foi encontrado na região basal da folha, enquanto que o CAM se expressou com maior intensidade na porção apical, sugerindo a existência de uma sinalização da redução hídrica entre a parte basal e a apical da folha. De fato, foram detectados maiores quantidades de ABA, em resposta ao déficit hídrico imposto pelo PEG, ao longo de todo o comprimento foliar, com maior quantidade na região apical. Teores significativamente maiores de NO foram detectados por espectrofluorimetria nos últimos três dias de… Advisors/Committee Members: Mercier, Helenice.

Subjects/Keywords: Abscisic acid; Ácido abscísico; Crassulacean acid metabolism; Metabolismo ácido das crassuláceas; Nitric oxide; Óxido nítrico

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mioto, P. T. (2012). Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae). (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/41/41132/tde-11072012-094636/ ;

Chicago Manual of Style (16^th Edition):

Mioto, Paulo Tamaso. “Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae).” 2012. Masters Thesis, University of São Paulo. Accessed January 19, 2021. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-11072012-094636/ ;.

MLA Handbook (7^th Edition):

Mioto, Paulo Tamaso. “Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae).” 2012. Web. 19 Jan 2021.

Vancouver:

Mioto PT. Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae). [Internet] [Masters thesis]. University of São Paulo; 2012. [cited 2021 Jan 19]. Available from: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-11072012-094636/ ;.

Council of Science Editors:

Mioto PT. Sinalização da indução do metabolismo ácido das crassuláceas (CAM) por ácido abscísico e óxido nítrico em Guzmania monostachia (Bromeliaceae). [Masters Thesis]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-11072012-094636/ ;

Rhodes University

11. Power, Sean Duncan. The water and nutrient potential of brewery effluent for hydroponic tomato production.

Degree: MS, Faculty of Science, Ichthyology and Fisheries Science, 2014, Rhodes University

URL: http://hdl.handle.net/10962/d1011604

► Brewery effluent that had undergone treatment in an anaerobic digester (AD) was used as an alternative water and nutrient source for hydroponic crop production. Brewery… (more)

▼ Brewery effluent that had undergone treatment in an anaerobic digester (AD) was used as an alternative water and nutrient source for hydroponic crop production. Brewery effluent was demonstrated to contain sufficient nutrients to support the growth, flowering and fruiting of Lycopersicum escolentum "Moneymaker" tomato crops. The adjustment of the effluent pH with phosphoric acid to between pH 6.0 and 6.5 increased the development of the crops by around 100% compared to crops grown in unaltered effluent. The pH adjusted effluent-grown plants grew to a mean height of 831.4 ± 21.1 mm and a dry biomass weight of 42.34 ± 2.76 g compared to the unaltered pH effluent plants which grew to a height of 410.6 ± 20.5 mm and a weight of 7.65 ± 0.68 g after 49 days. Effluent treatment in high-rate algal ponds (HRAP) was determined to have no positive effect on the nutritional potential of the effluent for Moneymaker production. The effluent-grown plants did not perform as well as plants grown in inorganic-fertilizer and municipal water. Plants grown in effluent grew taller but did not produce significantly more fruit when phosphoric acid (height: 1573.3 ± 50.4 mm, 19.4 ± 1.4 fruit per plant) was compared to nitric acid (height: 1254.1 ± 25.4 mm, 15.6 ± 1.5 fruit per plant) as the pH adjustment over 72 days. Direct and secondary plant stresses from effluent alkalinity, ammonium nutrition, nitrogen limitation, sodium concentrations and heat stress among other factors were probably confounding variables in these trials and require further investigation. Considering the raw effluent composition and manipulating the AD operation is a potential opportunity to improve overall AD performance, reduce chemical inputs in the effluent treatment process, reduce the final effluent alkalinity, and increase available nitrogen content in the final effluent. The anaerobic digester discharging >1000 m³ of nutrient enriched effluent every day is a resource with considerable potential. The benefits of developing this resource can contribute to cost-reduction at the brewery, more efficient water, nutrient and energy management at the brewery, and offer opportunities for job creation and potentially benefit local food security. Advisors/Committee Members: Jones, Clifford Louis Wilshire, Britz, P. J. (Peter Jacobus), 1959-.

Subjects/Keywords: Hydroponics; Tomatoes – Breeding; Brewery waste; Water – Purification; Algae culture; Algae – Biotechnology; Nitric acid; Phosphoric acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Power, S. D. (2014). The water and nutrient potential of brewery effluent for hydroponic tomato production. (Masters Thesis). Rhodes University. Retrieved from http://hdl.handle.net/10962/d1011604

Chicago Manual of Style (16^th Edition):

Power, Sean Duncan. “The water and nutrient potential of brewery effluent for hydroponic tomato production.” 2014. Masters Thesis, Rhodes University. Accessed January 19, 2021. http://hdl.handle.net/10962/d1011604.

MLA Handbook (7^th Edition):

Power, Sean Duncan. “The water and nutrient potential of brewery effluent for hydroponic tomato production.” 2014. Web. 19 Jan 2021.

Vancouver:

Power SD. The water and nutrient potential of brewery effluent for hydroponic tomato production. [Internet] [Masters thesis]. Rhodes University; 2014. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10962/d1011604.

Council of Science Editors:

Power SD. The water and nutrient potential of brewery effluent for hydroponic tomato production. [Masters Thesis]. Rhodes University; 2014. Available from: http://hdl.handle.net/10962/d1011604

Universiteit Utrecht

12. Rangel Campos, M. Global GHG abatement potential for the nitrogen fertlizer industry up to 2030.

Degree: 2011, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/254776

► This dissertation studies the global GHG abatement potential of nitrogen fertilizer industry up to 2030. In order to acknowledge it, a data base of the… (more)

Subjects/Keywords: Geowetenschappen; ammonia, urea, nitric acid, energy, saving measures

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rangel Campos, M. (2011). Global GHG abatement potential for the nitrogen fertlizer industry up to 2030. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/254776

Chicago Manual of Style (16^th Edition):

Rangel Campos, M. “Global GHG abatement potential for the nitrogen fertlizer industry up to 2030.” 2011. Masters Thesis, Universiteit Utrecht. Accessed January 19, 2021. http://dspace.library.uu.nl:8080/handle/1874/254776.

MLA Handbook (7^th Edition):

Rangel Campos, M. “Global GHG abatement potential for the nitrogen fertlizer industry up to 2030.” 2011. Web. 19 Jan 2021.

Vancouver:

Rangel Campos M. Global GHG abatement potential for the nitrogen fertlizer industry up to 2030. [Internet] [Masters thesis]. Universiteit Utrecht; 2011. [cited 2021 Jan 19]. Available from: http://dspace.library.uu.nl:8080/handle/1874/254776.

Council of Science Editors:

Rangel Campos M. Global GHG abatement potential for the nitrogen fertlizer industry up to 2030. [Masters Thesis]. Universiteit Utrecht; 2011. Available from: http://dspace.library.uu.nl:8080/handle/1874/254776

13. Bajoria, Shaila L. Studies in the extraction of tri-n-butyl phosphate from aqueous solutions.

Degree: Chemistry, 2012, INFLIBNET

URL: http://shodhganga.inflibnet.ac.in/handle/10603/9055

►

30%TBP in dodecane is used for recovering plutonium and uranium from spent nuclear fuel in PUREX process. Mutual solubility of aqueous and the solvent phase… (more)

Subjects/Keywords: Chemistry; PUREX process; CAL-MSU; Nitric acid; Dodecane; TBP

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Bajoria, S. L. (2012). Studies in the extraction of tri-n-butyl phosphate from aqueous solutions. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/9055

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):

Bajoria, Shaila L. “Studies in the extraction of tri-n-butyl phosphate from aqueous solutions.” 2012. Thesis, INFLIBNET. Accessed January 19, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/9055.

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

MLA Handbook (7^th Edition):

Bajoria, Shaila L. “Studies in the extraction of tri-n-butyl phosphate from aqueous solutions.” 2012. Web. 19 Jan 2021.

Vancouver:

Bajoria SL. Studies in the extraction of tri-n-butyl phosphate from aqueous solutions. [Internet] [Thesis]. INFLIBNET; 2012. [cited 2021 Jan 19]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9055.

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

Council of Science Editors:

Bajoria SL. Studies in the extraction of tri-n-butyl phosphate from aqueous solutions. [Thesis]. INFLIBNET; 2012. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9055

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

University of Newcastle

14. Rayson, Mark Stuart. Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives.

Degree: PhD, 2012, University of Newcastle

URL: http://hdl.handle.net/1959.13/935775

►

Research Doctorate - Doctor of Philosophy (PhD)

This thesis examines the rates and mechanisms of chemical reactions leading to production of nitrogen oxides during nitrosation… (more)

Subjects/Keywords: nitrous acid; nitrosyl thiocyanate; nitric oxide; nitrosation; emulsion explosives; ammonium nitrate

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rayson, M. S. (2012). Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/935775

Chicago Manual of Style (16^th Edition):

Rayson, Mark Stuart. “Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives.” 2012. Doctoral Dissertation, University of Newcastle. Accessed January 19, 2021. http://hdl.handle.net/1959.13/935775.

MLA Handbook (7^th Edition):

Rayson, Mark Stuart. “Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives.” 2012. Web. 19 Jan 2021.

Vancouver:

Rayson MS. Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives. [Internet] [Doctoral dissertation]. University of Newcastle; 2012. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1959.13/935775.

Council of Science Editors:

Rayson MS. Nitric oxide formation in nitrosation reactions, with applications in the sensitisation of emulsion explosives. [Doctoral Dissertation]. University of Newcastle; 2012. Available from: http://hdl.handle.net/1959.13/935775

North-West University

15. Medupe, Elizabeth. An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe .

Degree: 2014, North-West University

URL: http://hdl.handle.net/10394/15413

► Industrial activities of mankind are feared to damage the environment irretrievably. Especially the release of huge amounts of harmful gases causes concern. In this regard… (more)

▼ Industrial activities of mankind are feared to damage the environment irretrievably. Especially the release of huge amounts of harmful gases causes concern. In this regard the environmental pollution caused by the one billion motor vehicles on earth is particularly important. The platinum-group metals (PGM) are well known for their catalytic activity. They are used extensively for reducing the amounts of hydrocarbons, carbon monoxide and nitrogen oxides from the exhausts gas emitted by automobiles. In 2012 20% of platinum and 27% of palladium produced were used in the manufacture of catalytic converters. With the increasing use of PGM-containing autocatalysts, the reclaiming of PGMs from spent catalysts has become essential. Particularly attractive hydrometallurgical methods are those based on the use of halide ions e.g. sodium chloride, as complexing agent in conjunction with nitric acid as oxidant. The chemical reactions between mixtures of aluminium chloride and nitric acid have been studied, but the electrochemical reactions have received little attention. The research reported in this dissertation is aimed at providing data relating to the electrochemical behaviour of platinum in mixtures of aluminium chloride and nitric acid. The construction of Pourbaix diagrams of platinum in chloride environments confirmed that the stable chloro-complexes [PtCl4]2- and PtCl6]2-, as well as platinum oxides (PtO and PtO2) could play a role under the experimental conditions employed in this study. From the thermodynamic results it can be concluded that the systems deserving consideration favour high chloride concentrations and high temperatures. Notable anodic reactions found were the adsorption of chloride on the platinum surface and the gradual formation of [PtCl6]2-, followed by the formation of platinum oxides at 1.00 to 1.01 V. The results show that anodic currents diminished with lower chloride concentrations. A seemingly anomalous anodic behaviour at 35 °C and 45 °C could be explained in terms of a competition between platinum oxide formation and the formation of platinum chloro-complexes. Evidence for the following cathodic reduction reactions was found: hydrogen evolution, reduction of dissolved oxygen to hydrogen dioxide (-1.3 V SHE), nitrate ion reduction to nitrite ions (-0.01 V SHE), nitrite ion reduction to nitric oxide (-0.85 V SHE) and reduction of PtO and PtO2 to Pt (at -1.00 V and 1.01 V SHE, respectively). A brief study was undertaken in an attempt to relate the electrochemical results to the leaching of platinum from a virgin automotive exhaust catalyst. The recovery was low for mixtures with low chloride concentrations, which could be expected from the electrochemical polarisation curves obtained in electrolytes with different chloride concentrations. The maximum platinum recovery attained, was 60% at 45 °C in a mixture containing 0.6 M AlCl3 and 0.9 M HNO3.

Subjects/Keywords: Platinum; Electrochemistry; Pourbaix diagrams; Aluminum chloride; Nitric acid; Leaching

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Medupe, E. (2014). An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe . (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/15413

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):

Medupe, Elizabeth. “An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe .” 2014. Thesis, North-West University. Accessed January 19, 2021. http://hdl.handle.net/10394/15413.

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

MLA Handbook (7^th Edition):

Medupe, Elizabeth. “An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe .” 2014. Web. 19 Jan 2021.

Vancouver:

Medupe E. An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe . [Internet] [Thesis]. North-West University; 2014. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10394/15413.

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

Council of Science Editors:

Medupe E. An electrochemical investigation of the dissolution of platinum employing AICI3/HNO3 / Elizabeth Medupe . [Thesis]. North-West University; 2014. Available from: http://hdl.handle.net/10394/15413

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

Universitat Rovira i Virgili

16. Santiago Redondo, Marta. Hexaaluiminate-type catalysts for n2o abatement.

Degree: Departament de Química Física i Inorgànica, 2010, Universitat Rovira i Virgili

URL: http://hdl.handle.net/10803/9111

► Over the last decades, a large number of catalysts have been studied for catalytic decomposition of N2O. Most of these catalysts failed to be an… (more)

Subjects/Keywords: hexaaluminate; nitric acid; N20 abatement; Catalysis; 542; 546

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Santiago Redondo, M. (2010). Hexaaluiminate-type catalysts for n2o abatement. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/9111

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):

Santiago Redondo, Marta. “Hexaaluiminate-type catalysts for n2o abatement.” 2010. Thesis, Universitat Rovira i Virgili. Accessed January 19, 2021. http://hdl.handle.net/10803/9111.

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

MLA Handbook (7^th Edition):

Santiago Redondo, Marta. “Hexaaluiminate-type catalysts for n2o abatement.” 2010. Web. 19 Jan 2021.

Vancouver:

Santiago Redondo M. Hexaaluiminate-type catalysts for n2o abatement. [Internet] [Thesis]. Universitat Rovira i Virgili; 2010. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10803/9111.

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

Council of Science Editors:

Santiago Redondo M. Hexaaluiminate-type catalysts for n2o abatement. [Thesis]. Universitat Rovira i Virgili; 2010. Available from: http://hdl.handle.net/10803/9111

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

University of Western Ontario

17. Turnbull, Joseph P. The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers.

Degree: 2020, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/6903

► In Canada, the proposed disposal method for high level nuclear waste involves sealing the waste in steel containers with a 3 mm outer copper coating… (more)

▼ In Canada, the proposed disposal method for high level nuclear waste involves sealing the waste in steel containers with a 3 mm outer copper coating and burying it in a deep geologic repository. However, the thickness of the container is significantly reduced making a reassessment of the influence of γ-radiation, emitted by the waste form, on container corrosion a potential licensing requirement. Under humid aerated conditions, the formation of nitric acid is expected, potentially resulting in the formation of droplets or wetted layers on the container surface. Currently available literature on the corrosion of copper in nitric acid does not provide sufficient evidence to determine the extent of container corrosion. The effect of high copper surface area to solution volumes (SA/V) was investigated by monitoring the pH and dissolved copper content in a small cell. The corrosion rate was shown to be dependent on the oxygen concentration with significant damage in its presence but little damage in its absence. Nitric acid had only a minor effect on the corrosion rate. Scanning electron microscopy (SEM) showed that the deposition of corrosion products prevented significant corrosion penetration. The kinetics of corrosion were investigated in cells with a low SA/V ratio using corrosion potential and polarization resistance measurements to follow the kinetics, and SEM and Raman spectroscopy to investigate the corrosion products. The corrosion rate was found to be independent of proton and nitrate concentrations and first order with respect to oxygen concentration. X-ray photoelectron spectroscopy showed that nitrate adsorption occurred on the copper surface when oxygen was absent. Nitrite, the product of nitrate reduction was found to react rapidly with copper leading to a high corrosion rate. Chloride, the most common anion in analyzed groundwaters, was found to have a negligible effect on corrosion despite its ability to increase cuprous ion solubility by complexation. It was demonstrated that the key role of oxygen was to produce cuprous ions which then catalyzed the reduction of nitrate to the much more aggressive nitrite with the cupric ion formed then reacting with copper in a catalytic cycle to reproduce the cuprous ion.

Subjects/Keywords: Copper; Nitric Acid; Corrosion; Nuclear Waste Disposal; Electrochemistry; Mechanism; Analytical Chemistry

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Turnbull, J. P. (2020). The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6903

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):

Turnbull, Joseph P. “The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers.” 2020. Thesis, University of Western Ontario. Accessed January 19, 2021. https://ir.lib.uwo.ca/etd/6903.

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

MLA Handbook (7^th Edition):

Turnbull, Joseph P. “The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers.” 2020. Web. 19 Jan 2021.

Vancouver:

Turnbull JP. The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers. [Internet] [Thesis]. University of Western Ontario; 2020. [cited 2021 Jan 19]. Available from: https://ir.lib.uwo.ca/etd/6903.

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

Council of Science Editors:

Turnbull JP. The Influence of Radiolytically Produced Nitric Acid on the Corrosion Resistance of Copper-Coated Used Nuclear Fuel Containers. [Thesis]. University of Western Ontario; 2020. Available from: https://ir.lib.uwo.ca/etd/6903

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

University of the Western Cape

18. Klein, Ashwil Johan. Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress .

Degree: 2012, University of the Western Cape

URL: http://hdl.handle.net/11394/4502

► This study explores the roles of exogenously applied nitric oxide, exogenously applied caffeic acid and salt stress on the antioxidant system in cereal (exemplified by… (more)

▼ This study explores the roles of exogenously applied nitric oxide, exogenously applied caffeic acid and salt stress on the antioxidant system in cereal (exemplified by maize) and legume (using soybean as an example) plants together with their influence on membrane integrity and cell death.This study investigates changes in H2O2 content, root lipid peroxidation, root cell death and antioxidant enzymatic activity in maize roots in response to exogenously applied nitric oxide (NO) and salt stress. This part of the study is based on the partially understood interaction between NO and reactive oxygen species (ROS) such as H2O2 and the role of antioxidant enzymes in plant salt stress responses. The results show that application of salt (NaCl) results in elevated levels of H2O2 and an increase in lipid peroxidation, consequently leading to increased cell death. The study also shows that by regulating the production and detoxification of ROS through modulation of antioxidant enzymatic activities, NO plays a pivotal role in maize responses to salt stress. The study argues for NO as a regulator of redox homeostasis that prevents excessive ROS accumulation during exposure of maize to salinity stress that would otherwise be deleterious to maize. This study extends the role of exogenously applied NO to improve salt stress tolerance in cereals crops (maize) further to its role in enhancing salt stress tolerance in legumes. The effect of long-term exposure of soybean to NO and salt stress on root nodule antioxidant activity was investigated to demonstrate the role of NO in salt stress tolerance. The results show that ROS scavenging antioxidative enzymes like SOD, GPX and GR are differentially regulated in response to exogenous application of NO and salt stress. It remains to be determined if the NOinduced changes in antioxidant enzyme activity under salt stress are sufficient to efficiently reduce ROS accumulation in soybean root nodules to levels close to those of unstressed soybean root nodules. Furthermore, this study investigates the effect of long-term exposure of soybean to exogenous caffeic acid (CA) and salt stress, on the basis of the established role of CA as an antioxidant and the involvement of antioxidant enzymes in plant salt stress responses. The effect of CA on soybean nodule number, biomass (determined on the basis of nodule dry weight, root dry weight and shoot dry weight), nodule NO content, and nodule cyclic guanosine monophosphate (cGMP) content in response to salt stress was investigated. Additionally, CA-induced changes in nodule ROS content, cell viability, lipid peroxidation and antioxidant enzyme activity as well as some genes that encode antioxidant enzymes were investigated in the presence or absence of salt stress. The study shows that long-term exposure of soybean to salt stress results in reduced biomass associated with accumulation of ROS, elevated levels of lipid peroxidation and elevated levels of cell death. However, exogenously applied CA reversed the negative effects of salt stress on soybean… Advisors/Committee Members: Ludidi, Ndomelele Ndiko (advisor), Keyster, Marshall (advisor).

Subjects/Keywords: Nitric oxide; Antioxidant enzymes; Caffeic acid; Salt stress tolerance

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Klein, A. J. (2012). Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4502

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):

Klein, Ashwil Johan. “Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress .” 2012. Thesis, University of the Western Cape. Accessed January 19, 2021. http://hdl.handle.net/11394/4502.

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

MLA Handbook (7^th Edition):

Klein, Ashwil Johan. “Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress .” 2012. Web. 19 Jan 2021.

Vancouver:

Klein AJ. Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress . [Internet] [Thesis]. University of the Western Cape; 2012. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/11394/4502.

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

Council of Science Editors:

Klein AJ. Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress . [Thesis]. University of the Western Cape; 2012. Available from: http://hdl.handle.net/11394/4502

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

19. Horne, Gregory Peter. An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:275818

► Plutonium Uranium Reduction EXtraction (PUREX) technology is a solvent extraction process used to recover plutonium and uranium from spent nuclear fuel. The solvent system is… (more)

▼ Plutonium Uranium Reduction EXtraction (PUREX) technology is a solvent extraction process used to recover plutonium and uranium from spent nuclear fuel. The solvent system is composed of an aqueous nitric acid phase in contact with an organic phase made up of tributyl phosphate in an organic diluent. During the separation process, the PUREX solvent system is subject to an intense multi-component radiation field (gamma rays, alpha particles, beta particles, neutrons, and fission fragments) rendering it susceptible to radiolytic degradation, which reduces its performance. Despite the PUREX process being used for over sixty years, a complete quantitative mechanistic understanding of the radiolytic degradation processes is not available. Nitrous acid is the most significant radiolytic degradation product of nitric acid, especially as its chemical and physical properties alter the formulation of the PUREX solvent system. Furthermore, nitrous acid exhibits complex redox relationships with a number of actinides, with plutonium being of greatest concern to the performance of the PUREX process. A combination of experimental and computational (stochastic and deterministic) techniques have been used to investigate the radiolysis of the PUREX solvent system’s aqueous phase, specifically the radiolytic formation of nitrous acid, and its conjugate base nitrite, as a function of solvent system formulation, absorbed dose (up to 1.7 kGy), and radiation quality (cobalt-60 gamma rays and alpha particles from plutonium and americium alpha decay). The research presented in this thesis focuses on: (i) the experimental radiation chemistry of solutions of nitric acid and sodium nitrate over the range of concentrations 1 × 10−3 to 6 mol dm−3, and (ii) the development of a multi-scale modelling approach for evaluating the radiolysis of aqueous systems in terms of reaction mechanisms. The experimental and modelling studies provide insight into the radiation chemistry of the PUREX solvent system’s aqueous phase, mechanistically demonstrating how the radiation chemical yield of nitrous acid and nitrite is dependent upon the interplay between non-homogeneous radiation track chemistry and secondary bulk homogeneous chemistry. This interplay is influenced by low pH, the presence of chemical scavengers and redox active metal ions, and radiation quality. These findings will act as a benchmark for the development of advanced reprocessing schemes, which must seriously consider how modifications in solvent system formulation and fuel composition may affect this dynamic interplay, and ultimately the generation of secondary highly active liquid waste. Advisors/Committee Members: SHARRAD, CLINT CA, Sharrad, Clint, Pimblott, Simon.

Subjects/Keywords: PUREX; Radiolysis; Nitric acid; Nitrate; Gamma; Plutonium; Americium; Multi-scale modelling

14 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Horne, G. P. (2015). An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:275818

Chicago Manual of Style (16^th Edition):

Horne, Gregory Peter. “An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems.” 2015. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:275818.

MLA Handbook (7^th Edition):

Horne, Gregory Peter. “An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems.” 2015. Web. 19 Jan 2021.

Vancouver:

Horne GP. An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Jan 19]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:275818.

Council of Science Editors:

Horne GP. An Experimental and Computational Investigation into the Radiolysis of PUREX Solvent Systems. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:275818

University of Sydney

20. Warner, Maximilian. The Kinetics of Industrial Ammonia Combustion .

Degree: 2013, University of Sydney

URL: http://hdl.handle.net/2123/9426

► This thesis uses experiments and modelling to determine the kinetics of industrial ammonia combustion over platinum gauzes. The study is motivated by the existing poor… (more)

Subjects/Keywords: Ammonia; Nitrous oxide; Combustion; Heterogeneous Catalysis; Nitric Acid; Ammonium Nitrate

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Warner, M. (2013). The Kinetics of Industrial Ammonia Combustion . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/9426

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):

Warner, Maximilian. “The Kinetics of Industrial Ammonia Combustion .” 2013. Thesis, University of Sydney. Accessed January 19, 2021. http://hdl.handle.net/2123/9426.

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

MLA Handbook (7^th Edition):

Warner, Maximilian. “The Kinetics of Industrial Ammonia Combustion .” 2013. Web. 19 Jan 2021.

Vancouver:

Warner M. The Kinetics of Industrial Ammonia Combustion . [Internet] [Thesis]. University of Sydney; 2013. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2123/9426.

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

Council of Science Editors:

Warner M. The Kinetics of Industrial Ammonia Combustion . [Thesis]. University of Sydney; 2013. Available from: http://hdl.handle.net/2123/9426

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

21. Rittmann, Marijke, 1982-. Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells.

Degree: MS, Nutritional Sciences, 2018, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/56111/

► Methylenetetrahydrofolate reductase (MTHFR) is a flavin adenine dinucleotide (FAD) - dependent, folate-metabolizing enzyme. The main product of MTHFR is methylenetetrahydrofolate, an important substrate for homocysteine… (more)

▼ Methylenetetrahydrofolate reductase (MTHFR) is a flavin adenine dinucleotide (FAD) - dependent, folate-metabolizing enzyme. The main product of MTHFR is methylenetetrahydrofolate, an important substrate for homocysteine metabolism and synthesis of methionine and the universal methyl donor, S-adenosylmethionine. MTHFR also catalyzes the reduction of dihydrobiopterin to tetrahydrobiopterin (BH4). BH4 is an essential cofactor for nitric oxide synthase (NOS) that produces nitric oxide (NO) for multiple functions including vasodilation and blood pressure (BP) regulation. Genome-wide association studies have linked a common polymorphism, C677T, in MTHFR with BP, and riboflavin supplements have been shown to reduce BP in individuals homozygous for the 677TT variant form of the enzyme. We hypothesize that this relationship between MTHFR, riboflavin, and BP is mediated through nitric oxide synthesis and that deficiency in either folic acid or riboflavin will result in decreased NO output. We investigated this hypothesis in vitro in stimulated murine macrophage RAW cells, which express the inducible form of NOS (iNOS). The cells were exposed to standard and reduced levels of folic acid and riboflavin. They were then stimulated with LPS. The cells were grown in medium with 0.4 mg/L riboflavin and 4.0 mg/L folic acid (control), 0.04 mg/L riboflavin (LowB2), or 0.4 mg/L folic acid (LowFA) for 48 hours, and then exposed to 100 ng/ml or 1000 ng/ml lipopolysaccharide (LPS) for 24 hours. Media was then analyzed for nitric oxide production by chemiluminescence assay using a Nitric Oxide Analyzer. Quantitative PCR was used to analyze gene expression of iNOS and arginase. In all three media conditions, no differences in RAW cell proliferation rates were observed over 48 hours. After LPS exposure, nitric oxide production in the LowB2 and LowFA cells was 30-35% and 35-40% of the control cells, respectively (p ≤ 0.001). Expression of iNOS after LPS induction increased in all three media conditions. Based on the findings above we further hypothesized that the decreased NO output from the B vitamin-deficient cells was due to insufficient BH4 availability to the cells. To test this hypothesis, a precursor of BH4, sepiapterin, was provided to the LowFA and LowB2 cells before stimulating NO production with LPS. Cells were treated with the same level of deficiency in folic acid and riboflavin as above, but were supplemented with 10 umol/L of sepiapterin at 0 hour and at the time of stimulation with 100 ng/mL LPS. Cells receiving sepiapterin before and during LPS exposure did not increase NO output when compared to those exposed only to LPS (p>0.8). LPS-induced nitric oxide production is reduced in RAW cells grown in either riboflavin or folic acid deficient media independent of iNOS expression. These results demonstrate the importance of the folate cycle in maintaining NOS function, and indicate a potential mechanism for the effects of MTHFR polymorphisms on BP. They also show that providing substrate for BH4 production is not sufficient to… Advisors/Committee Members: Miller, Joshua W (chair), Watford, Malcolm (internal member), Gow, Andrew J (outside member), School of Graduate Studies.

Subjects/Keywords: Nitric oxide; Folic acid

…DINUCLEOTIDE BH4 – 5,6,7,8 –TETRAHYDROBIOPTERIN NOS – NITRIC OXIDE SYNTHASE NO – NITRIC OXIDE BP… …MESSENGER RIBONUCLEIC ACID THF – TETRAHYDROFOLATE 10-FORMYLTHF – 10-FORMYLTETRAHYDROFOLATE 5… …with folic acid and riboflavin supplements (McAuley, McNulty, Hughes, Strain, & Ward… …x28;Horigan et al., 2010). Since giving folic acid to those with the variant allele had… …be seen with the same intervention. The results were that high doses of folic acid did not…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rittmann, Marijke, 1. (2018). Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/56111/

Chicago Manual of Style (16^th Edition):

Rittmann, Marijke, 1982-. “Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells.” 2018. Masters Thesis, Rutgers University. Accessed January 19, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/56111/.

MLA Handbook (7^th Edition):

Rittmann, Marijke, 1982-. “Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells.” 2018. Web. 19 Jan 2021.

Vancouver:

Rittmann, Marijke 1. Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells. [Internet] [Masters thesis]. Rutgers University; 2018. [cited 2021 Jan 19]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/56111/.

Council of Science Editors:

Rittmann, Marijke 1. Studies on the influence of folic acid and riboflavin on nitric oxide production in cultured murine macrophage cells. [Masters Thesis]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/56111/

22. Newton, Alfred Eastman. The precipitation of ammonium molybdates by nitric acid.

Degree: Chemistry, 1937, University of Massachusetts

URL: https://scholarworks.umass.edu/theses/1835

Subjects/Keywords: Ammonium molybdates; Nitric acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Newton, A. E. (1937). The precipitation of ammonium molybdates by nitric acid. (Thesis). University of Massachusetts. Retrieved from https://scholarworks.umass.edu/theses/1835

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):

Newton, Alfred Eastman. “The precipitation of ammonium molybdates by nitric acid.” 1937. Thesis, University of Massachusetts. Accessed January 19, 2021. https://scholarworks.umass.edu/theses/1835.

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

MLA Handbook (7^th Edition):

Newton, Alfred Eastman. “The precipitation of ammonium molybdates by nitric acid.” 1937. Web. 19 Jan 2021.

Vancouver:

Newton AE. The precipitation of ammonium molybdates by nitric acid. [Internet] [Thesis]. University of Massachusetts; 1937. [cited 2021 Jan 19]. Available from: https://scholarworks.umass.edu/theses/1835.

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

Council of Science Editors:

Newton AE. The precipitation of ammonium molybdates by nitric acid. [Thesis]. University of Massachusetts; 1937. Available from: https://scholarworks.umass.edu/theses/1835

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

Georgia Tech

23. Sjostedt, Steven Jeffrey. Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species.

Degree: PhD, Earth and Atmospheric Sciences, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/14109

► Recent field campaigns have measured enhanced levels of NOx (NO+NO2) and HOx precursors (i.e., H2O2, CH2O, and HONO) that can not be accounted for by… (more)

Subjects/Keywords: Nitric acid; Pernitric acid; OH; HOx; Nitric acid; Photochemistry; Atmospheric chemistry

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sjostedt, S. J. (2006). Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14109

Chicago Manual of Style (16^th Edition):

Sjostedt, Steven Jeffrey. “Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species.” 2006. Doctoral Dissertation, Georgia Tech. Accessed January 19, 2021. http://hdl.handle.net/1853/14109.

MLA Handbook (7^th Edition):

Sjostedt, Steven Jeffrey. “Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species.” 2006. Web. 19 Jan 2021.

Vancouver:

Sjostedt SJ. Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1853/14109.

Council of Science Editors:

Sjostedt SJ. Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/14109

University of Waikato

24. Davey, Cara-Lee. Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars .

Degree: 2008, University of Waikato

URL: http://hdl.handle.net/10289/2407

► The large scale nitric acid oxidation of common sugars into their corresponding aldaric acids is being investigated as an important source of potentially useful components… (more)

Subjects/Keywords: nitric acid oxidation; glucaric acid; Ion Chromatography; organic acid

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Davey, C. (2008). Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/2407

Chicago Manual of Style (16^th Edition):

Davey, Cara-Lee. “Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars .” 2008. Masters Thesis, University of Waikato. Accessed January 19, 2021. http://hdl.handle.net/10289/2407.

MLA Handbook (7^th Edition):

Davey, Cara-Lee. “Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars .” 2008. Web. 19 Jan 2021.

Vancouver:

Davey C. Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars . [Internet] [Masters thesis]. University of Waikato; 2008. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10289/2407.

Council of Science Editors:

Davey C. Development of an Ion Chromatography Method for the Analysis of Nitric Acid Oxidation Reactions of Common Sugars . [Masters Thesis]. University of Waikato; 2008. Available from: http://hdl.handle.net/10289/2407

NSYSU

25. Ou, Che-Hung. Study on the recovery of spent nitric acid liquor containing formaldehyde and copper.

Degree: Master, Environmental Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802114-110110

► Water-borne nitrate and fertilizers make ground water heavily polluted by nitrate-N in addition to other associated pollutants. Recently, nitrate emission to water bodies are regulated… (more)

Subjects/Keywords: thermal oxidation; nitrate nitrogen; formaldehyde; advanced oxidation processes (AOPs); nitric acid recovery

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ou, C. (2014). Study on the recovery of spent nitric acid liquor containing formaldehyde and copper. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802114-110110

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):

Ou, Che-Hung. “Study on the recovery of spent nitric acid liquor containing formaldehyde and copper.” 2014. Thesis, NSYSU. Accessed January 19, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802114-110110.

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

MLA Handbook (7^th Edition):

Ou, Che-Hung. “Study on the recovery of spent nitric acid liquor containing formaldehyde and copper.” 2014. Web. 19 Jan 2021.

Vancouver:

Ou C. Study on the recovery of spent nitric acid liquor containing formaldehyde and copper. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Jan 19]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802114-110110.

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

Council of Science Editors:

Ou C. Study on the recovery of spent nitric acid liquor containing formaldehyde and copper. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802114-110110

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

26. Freschi, Luciano. Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus.

Degree: PhD, Botânica, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28012009-162750/ ;

► A expressão do metabolismo ácido crassuláceo (CAM) nas plantas C3-CAM facultativas pode ser fortemente modulada por uma variedade de sinais ambientais e endógenos. Visto que… (more)

▼ A expressão do metabolismo ácido crassuláceo (CAM) nas plantas C3-CAM facultativas pode ser fortemente modulada por uma variedade de sinais ambientais e endógenos. Visto que plantas de abacaxizeiro (Ananas comosus, variedade Smooth Cayenne) podem apresentar comportamento fotossintético do tipo C3 ou CAM quando cultivadas in vitro, o presente trabalho buscou analisar a participação de quatro classes hormonais (ácido abscísico, citocininas, auxinas e etileno), do cálcio citossólico (Ca2+cit.) e do óxido nítrico (NO) na regulação da expressão do CAM nessa bromélia. Para tanto, os teores endógenos desses sinalizadores foram quantificados durante a indução e a reversão do CAM em abacaxizeiro. Além disso, também foram realizadas análises do grau de expressão do CAM em plantas tratadas com esses compostos sinalizadores ou com seus inibidores de síntese, transporte ou percepção. Os dados obtidos evidenciaram uma correlação positiva entre os teores endógenos de ácido abscísico (ABA) e a expressão do CAM em abacaxizeiro, uma vez que a indução e a reversão do CAM foram acompanhadas de, respectivamente, aumentos e reduções no conteúdo foliar desse hormônio. Em consonância com esses resultados, o fornecimento de ABA exógeno resultou na indução do CAM em plantas mantidas na ausência de estresse hídrico, indicando, portanto, um efeito estimulatório desse hormônio sobre a expressão do CAM em A. comosus.Entretanto, constatou-se que a inibição do acúmulo de ABA não afetou a indução do CAM em resposta ao estresse hídrico, sugerindo que a transição de C3 para CAM em abacaxizeiro pode ocorrer tanto por uma via de sinalização dependente de ABA quanto por uma via independente de ABA. De modo inverso, os dados indicaram que as citocininas atuariam como reguladoras negativas da expressão do CAM em abacaxizeiro, uma vez que a aplicação desse hormônio inibiu parcialmente a indução do CAM em resposta ao estresse hídrico e, além disso, o conteúdo endógeno das quatro citocininas analisadas foi inversamente proporcional ao grau de expressão do CAM nessa bromélia. As auxinas e o etileno, por sua vez, parecem não estar envolvidos na regulação dos processos de indução e de reversão do CAM em abacaxizeiro. Por outro lado, os dados obtidos indicaram, de forma inédita, um papel sinalizador positivo do NO sobre a expressão da fotossíntese CAM. Verificou-se, por exemplo, que a aplicação de NO exógeno promoveu um aumento considerável na expressão do CAM em plantas de abacaxizeiro e, de modo condizente, foi observado um incremento na produção desse radical livre durante a transição da fotossíntese C3 para CAM em resposta ao estresse hídrico. Além disso, foi interessante constatar que a elevação na síntese de NO nos tecidos foliares de abacaxizeiro ocorreu principalmente no parênquima clorofiliano, sendo este tecido um dos principais alvos das alterações metabólicas necessárias para o estabelecimento da fotossíntese CAM. Os resultados também sugerem que o NO atuaria como um mensageiro secundário do sinal do ABA na indução do CAM, já que a produção desse… Advisors/Committee Members: Mercier, Helenice.

Subjects/Keywords: Crassulacean acid metabolism; Hormônios vegetais; Metabolismo ácido crassuláceo; Nitric oxide; Óxido nítrico; Plant hormones

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Freschi, L. (2008). Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28012009-162750/ ;

Chicago Manual of Style (16^th Edition):

Freschi, Luciano. “Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus.” 2008. Doctoral Dissertation, University of São Paulo. Accessed January 19, 2021. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28012009-162750/ ;.

MLA Handbook (7^th Edition):

Freschi, Luciano. “Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus.” 2008. Web. 19 Jan 2021.

Vancouver:

Freschi L. Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus. [Internet] [Doctoral dissertation]. University of São Paulo; 2008. [cited 2021 Jan 19]. Available from: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28012009-162750/ ;.

Council of Science Editors:

Freschi L. Sinalização hormonal e do óxido nítrico na indução do metabolismo ácido crassuláceo em Ananas comosus. [Doctoral Dissertation]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28012009-162750/ ;

NSYSU

27. Chang, Yu-Lun. Bio-inspired Cu-NiRs model compounds from coordination chemistry to application.

Degree: PhD, Chemistry, 2018, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728118-002621

► The first chapter introduces copper cantaining nitrite reductase (Cu-NiRs) and its catalytic mechanism which include the real enzymes and bio-inspired model compounds. The second chapter… (more)

Subjects/Keywords: L-ascorbic acid; Nitric oxide; Nitrite; Electronic effect; Steric hindrance; Cu-NiRs

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chang, Y. (2018). Bio-inspired Cu-NiRs model compounds from coordination chemistry to application. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728118-002621

Chicago Manual of Style (16^th Edition):

Chang, Yu-Lun. “Bio-inspired Cu-NiRs model compounds from coordination chemistry to application.” 2018. Doctoral Dissertation, NSYSU. Accessed January 19, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728118-002621.

MLA Handbook (7^th Edition):

Chang, Yu-Lun. “Bio-inspired Cu-NiRs model compounds from coordination chemistry to application.” 2018. Web. 19 Jan 2021.

Vancouver:

Chang Y. Bio-inspired Cu-NiRs model compounds from coordination chemistry to application. [Internet] [Doctoral dissertation]. NSYSU; 2018. [cited 2021 Jan 19]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728118-002621.

Council of Science Editors:

Chang Y. Bio-inspired Cu-NiRs model compounds from coordination chemistry to application. [Doctoral Dissertation]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728118-002621

University of the Western Cape

28. Hlatshwayo, Siphiwe Gift. Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize .

Degree: 2018, University of the Western Cape

URL: http://hdl.handle.net/11394/6758

► In recent years, nitric oxide (NO) has emerged as an important endogenous plant signalling molecule that mediates many developmental and physiological processes. NO regulates the… (more)

▼ In recent years, nitric oxide (NO) has emerged as an important endogenous plant signalling molecule that mediates many developmental and physiological processes. NO regulates the activity of antioxidant enzymes in response to droughtinduced stress by controlling the expression of the genes that encode these enzymes. Antioxidant enzymes function in scavenging reactive oxygen species like superoxide ion (O2 -) and hydrogen peroxide (H2O2) that are generated in response to drought-induced stress and other abiotic stresses. Abscisic acid, a phytohormone that acts as a stress-related hormone in plants, also stimulates production of H2O2, thus further triggering the antioxidant enzyme activity in order to scavenge the excess H2O2. Accumulated data indicate that NO interacts with reactive oxygen species, notably hydrogen peroxide and superoxide. This study was aimed at clarifying the role of NO derived from nitric oxide synthase-like (NOS-like) enzymatic activity in scavenging of H2O2 and to establish if this is dependent or independent of ABA signaling. This was achieved by using Nω-Nitro-L-Arginine methyl ester (L-NAME), an inhibitor of NOS to control the amount of NO in maize tissue. The study investigated the effect of L-NAME on the accumulation of superoxide, which is scavenged by superoxide dismutase. Furthermore, the study determined the role of NOS-like activity in ABA-mediated production of H2O2. Lastly, the effect of L-NAME on H2O2 accumulation and antioxidant enzyme activity was also investigated. Application of L-NAME altered the enzymatic activity of superoxide dismutase, ascorbate peroxidase and catalase. These changes in enzymatic activity were coupled with altered levels of O2 - and H2O2 in leaves and roots. Treatments with ABA in combination with L-NAME resulted in reversal of H2O2 content to basal levels. These results suggest that nitric oxide, produced by nitric oxide synthase-like activity, is important in regulation of antioxidant enzyme activity and cross-talks with ABA. Advisors/Committee Members: Ludidi, Ndomelele Ndiko (advisor), Phillips, Kyle (advisor).

Subjects/Keywords: Drought-induced stress; Abscisic acid; Hydrogen peroxide; Zea mays; Reactive oxygen species; Nitric oxide

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hlatshwayo, S. G. (2018). Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/6758

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):

Hlatshwayo, Siphiwe Gift. “Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize .” 2018. Thesis, University of the Western Cape. Accessed January 19, 2021. http://hdl.handle.net/11394/6758.

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

MLA Handbook (7^th Edition):

Hlatshwayo, Siphiwe Gift. “Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize .” 2018. Web. 19 Jan 2021.

Vancouver:

Hlatshwayo SG. Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize . [Internet] [Thesis]. University of the Western Cape; 2018. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/11394/6758.

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

Council of Science Editors:

Hlatshwayo SG. Involvement of abscisic acid and H2O2 in antioxidant enzyme activities mediated by nitric oxide synthase-like activity in maize . [Thesis]. University of the Western Cape; 2018. Available from: http://hdl.handle.net/11394/6758

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

University of Manchester

29. Horne, Gregory. An experimental and computational investigation into the radiolysis of PUREX solvent systems.

Degree: PhD, 2016, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-and-computational-investigation-into-the-radiolysis-of-purex-solvent-systems(a793f6ee-0b49-47ce-ae2b-cd88d94c53a0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728082

► Plutonium Uranium Reduction EXtraction (PUREX) technology is a solvent extraction process used to recover plutonium and uranium from spent nuclear fuel. The solvent system is… (more)

▼ Plutonium Uranium Reduction EXtraction (PUREX) technology is a solvent extraction process used to recover plutonium and uranium from spent nuclear fuel. The solvent system is composed of an aqueous nitric acid phase in contact with an organic phase made up of tributyl phosphate in an organic diluent. During the separation process, the PUREX solvent system is subject to an intense multi-component radiation field (gamma rays, alpha particles, beta particles, neutrons, and fission fragments) rendering it susceptible to radiolytic degradation, which reduces its performance. Despite the PUREX process being used for over sixty years, a complete quantitative mechanistic understanding of the radiolytic degradation processes is not available. Nitrous acid is the most significant radiolytic degradation product of nitric acid, especially as its chemical and physical properties alter the formulation of the PUREX solvent system. Furthermore, nitrous acid exhibits complex redox relationships with a number of actinides, with plutonium being of greatest concern to the performance of the PUREX process. A combination of experimental and computational (stochastic and deterministic) techniques have been used to investigate the radiolysis of the PUREX solvent system's aqueous phase, specifically the radiolytic formation of nitrous acid, and its conjugate base nitrite, as a function of solvent system formulation, absorbed dose (up to 1.7 kGy), and radiation quality (cobalt-60 gamma rays and alpha particles from plutonium and americium alpha decay). The research presented in this thesis focuses on: (i) the experimental radiation chemistry of solutions of nitric acid and sodium nitrate over the range of concentrations 1 × 10-3 to 6 mol dm-3, and (ii) the development of a multi-scale modelling approach for evaluating the radiolysis of aqueous systems in terms of reaction mechanisms. The experimental and modelling studies provide insight into the radiation chemistry of the PUREX solvent system's aqueous phase, mechanistically demonstrating how the radiation chemical yield of nitrous acid and nitrite is dependent upon the interplay between non-homogeneous radiation track chemistry and secondary bulk homogeneous chemistry. This interplay is influenced by low pH, the presence of chemical scavengers and redox active metal ions, and radiation quality. These findings will act as a benchmark for the development of advanced reprocessing schemes, which must seriously consider how modifications in solvent system formulation and fuel composition may affect this dynamic interplay, and ultimately the generation of secondary highly active liquid waste.

Subjects/Keywords: 541; Multi-scale modelling; Americium; Gamma; Plutonium; Nitric acid; Radiolysis; PUREX; Nitrate

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Horne, G. (2016). An experimental and computational investigation into the radiolysis of PUREX solvent systems. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-and-computational-investigation-into-the-radiolysis-of-purex-solvent-systems(a793f6ee-0b49-47ce-ae2b-cd88d94c53a0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728082

Chicago Manual of Style (16^th Edition):

Horne, Gregory. “An experimental and computational investigation into the radiolysis of PUREX solvent systems.” 2016. Doctoral Dissertation, University of Manchester. Accessed January 19, 2021. https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-and-computational-investigation-into-the-radiolysis-of-purex-solvent-systems(a793f6ee-0b49-47ce-ae2b-cd88d94c53a0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728082.

MLA Handbook (7^th Edition):

Horne, Gregory. “An experimental and computational investigation into the radiolysis of PUREX solvent systems.” 2016. Web. 19 Jan 2021.

Vancouver:

Horne G. An experimental and computational investigation into the radiolysis of PUREX solvent systems. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Jan 19]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-and-computational-investigation-into-the-radiolysis-of-purex-solvent-systems(a793f6ee-0b49-47ce-ae2b-cd88d94c53a0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728082.

Council of Science Editors:

Horne G. An experimental and computational investigation into the radiolysis of PUREX solvent systems. [Doctoral Dissertation]. University of Manchester; 2016. Available from: https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-and-computational-investigation-into-the-radiolysis-of-purex-solvent-systems(a793f6ee-0b49-47ce-ae2b-cd88d94c53a0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728082

University of Manitoba

30. Hammond, Cassandra. Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots.

Degree: Plant Science, 2018, University of Manitoba

URL: http://hdl.handle.net/1993/33400

► The effect of drought stress on 3-leaf stage (V2) maize (Zea mays L.) seedlings over-expressing or down-regulating the Zea mays phytoglobin 1 gene (ZmPgb1) was… (more)

Subjects/Keywords: Phytoglobin; Drought stress; Ethylene; Abscisic acid; ABA; Nitric oxide; NO; Water stress; Maize; Corn

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hammond, C. (2018). Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33400

Chicago Manual of Style (16^th Edition):

Hammond, Cassandra. “Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots.” 2018. Masters Thesis, University of Manitoba. Accessed January 19, 2021. http://hdl.handle.net/1993/33400.

MLA Handbook (7^th Edition):

Hammond, Cassandra. “Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots.” 2018. Web. 19 Jan 2021.

Vancouver:

Hammond C. Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots. [Internet] [Masters thesis]. University of Manitoba; 2018. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1993/33400.

Council of Science Editors:

Hammond C. Over-expression of Phytoglobin alleviates PEG-induced water stress in maize shoots. [Masters Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/33400

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations