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You searched for subject:(On Site Detection). Showing records 1 – 2 of 2 total matches.

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Florida International University

1. Peters, Kelley L. Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives.

Degree: PhD, Chemistry, 2014, Florida International University

In recent years, there has been a dramatic increase in the use of improvised explosive devices (IEDs) due to ease of synthesis and improved controls placed on commercial/military explosives. Commonly used materials for IED preparations include fertilizers and industrial chemicals containing oxidizers such as ClO3-, ClO4-, and NO3-, as well as other less stable compounds, such as peroxides. Due to these materials having a wide range of volatility, polarity, and composition, detection can be challenging, increasing the amount of time before any analytical information on the identity of the explosive can be determined. Therefore, this research project developed two analytical methods to aid in the rapid detection of multiple explosive compounds. The use of microfluidic paper-based analytical devices (µPADs) allows for the development of inexpensive paper devices utilizing colorimetric reactions, which can perform five or more simultaneous analyses in approximately five minutes. Two devices were developed: one for the detection of inorganic explosives including ClO3-, ClO4-, NH4+, NO3-, and NO2-, and the second device detects high/organic explosives including RDX, TNT, urea nitrate, and peroxides. Limits of detection ranged from 0.4 µg – 20 µg of explosive residue with an analysis time of less than five minutes. Development of a confirmatory method utilizing infusion electrochemical detection-electrospray ionization-time-of-flight mass spectrometry (EC-ESI-TOF MS) and 18-crown-6 ethers to produce guest/host complexes with inorganic ions has also been completed. Utilizing this method the inorganic ions present in many IEDs can be successfully detected as ion pairs, while still allowing for the detection of other high explosives1. Placing an electrochemical detector before the mass spectrometer permits the detection of hydrogen peroxide, an analyte normally difficult to detect through mass spectrometry. Limits of detection ranged from 0.06 ppm - 2 ppm with an analysis time of less than two minutes. The development of these presumptive and confirmatory analytical methods permits the detection of a wide range of components present in IEDs. These methods decrease the amount of time required to relay information on the type of explosives present by simplifying the analysis process in the field and in a laboratory. Advisors/Committee Members: Bruce R. McCord, John Berry, Yong Cai, Chenzhong Li, Alexander Mebel.

Subjects/Keywords: Chemistry; Explosives; On-Site Detection; Colorimetric; Paper Microfluidics; Electrochemical Detection; Mass Spectrometry; Analytical Chemistry; Other Chemistry

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

APA (6th Edition):

Peters, K. L. (2014). Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/1659 ; 10.25148/etd.FI14110757 ; FI14110757

Chicago Manual of Style (16th Edition):

Peters, Kelley L. “Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives.” 2014. Doctoral Dissertation, Florida International University. Accessed September 20, 2020. https://digitalcommons.fiu.edu/etd/1659 ; 10.25148/etd.FI14110757 ; FI14110757.

MLA Handbook (7th Edition):

Peters, Kelley L. “Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives.” 2014. Web. 20 Sep 2020.

Vancouver:

Peters KL. Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives. [Internet] [Doctoral dissertation]. Florida International University; 2014. [cited 2020 Sep 20]. Available from: https://digitalcommons.fiu.edu/etd/1659 ; 10.25148/etd.FI14110757 ; FI14110757.

Council of Science Editors:

Peters KL. Development of Presumptive and Confirmatory Analytical Methods for the Simultaneous Detection of Multiple Improvised Explosives. [Doctoral Dissertation]. Florida International University; 2014. Available from: https://digitalcommons.fiu.edu/etd/1659 ; 10.25148/etd.FI14110757 ; FI14110757

2. Wang, Chen. Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment.

Degree: Docteur es, Sciences de l'environnement, 2015, Limoges

L'assainissement non collectif concerne 12 à 15 millions de personnes en France. La filière classique de ce mode d’assainissement se compose généralement d'un prétraitement anaérobie par une fosse septique recevant l’ensemble des eaux usées domestiques suivi d’un système d’infiltration dans le sol ou d’un filtre à sable. Le filtre à sable vertical drainé met à profit le pourvoir épuratoire qui est principalement lié à la présence d’une biomasse sous forme d’un biofilm. Cette dynamique de la croissance de la biomasse ou du biofilm est soumise à l’impact de la nature de matériaux filtrants. L’écoulement insaturé dans ces systèmes conditionne également cette croissance du biofilm. Dans ce contexte, l'objectif du travail de la thèse est d’appréhender les mécanismes mis en jeu et particulièrement l’impact des matériaux dans le fonctionnement des filtres en comparant notamment deux types de matériaux: les sables de rivière et les agrégats concassés. Pour cela, une étude expérimental sur une unité pilote composé des réacteurs de filtration du diamètre de 30cm et différents épaisseurs de garnissage (15, 30 et 70cm) a été construite. Les réacteurs garnis de deux sables roulés et deux agrégats concassés, sont alimentés en effluent septique avec une charge volumique 12cm/jour par 10 bâchés par jour. Suite des matériaux, une étude de la performance épuratoire avec le suivi des composants biochimiques de la biomasse totale et de la matrice extracellulaire du biofilm est réalisée en comparant notamment les deux types de matériaux filtrants.

The onsite wastewater treatment systems concern 12 to 15 million of people in France. The treatment plant is generally composed by a septic tank as pretreatment, followed by soil infiltration field or sand filtration bed. The vertical drained sand filter provides the purification capacity thanks to the presence of a biomass in form of the biofilm. The dynamic of the biomass growth or the biofilm development is under the impact of filter materials’ nature. In this context, the objective of this work is to understand the mechanisms involved and especially the impact of medium in the functioning of the filtration reactor by comparing two types of packing materials: river sands and crushed aggregates. For this purpose, an experimental study is conducted with pilot unity composed by filtration reactors of 30cm of diameter and different packing thicknesses (15, 30 and 70cm). The reactors packed with two river sands and two crushed aggregates are fed with septic effluent with a volumic hydraulic charge of 12cm/day by 10 batches per day. Based on a characterization of materials, a study of purification performance with biochemical components monitoring of the total biomass and the extracellular matrix of the biofilm is realized by comparing two types of filter materials. The purification performance has presented similar efficiencies of particulates and organic matters removals by fine river sand and fine crushed aggregate. The nitrogen pollutants removals are more effective in the fine river sand…

Advisors/Committee Members: Baudu, Michel (thesis director), Bourven, Isabelle (thesis director).

Subjects/Keywords: Assainissement non collectif; Filtre à sable; Épuration de l'effluent septique; Biofilm; EPS; Protéines; Substances humiques-like; Chromatographie d'exclusion stérique couplée à la détection de la fluorescence; On-site wastewater treatment; Packed bed filtration; Septic effluent purification; Biofilm; EPS; Proteins; Humic-like substance; Size exclusion chromatography coupled with fluorescence detection; 628.742

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

APA (6th Edition):

Wang, C. (2015). Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment. (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2015LIMO0058

Chicago Manual of Style (16th Edition):

Wang, Chen. “Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment.” 2015. Doctoral Dissertation, Limoges. Accessed September 20, 2020. http://www.theses.fr/2015LIMO0058.

MLA Handbook (7th Edition):

Wang, Chen. “Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment.” 2015. Web. 20 Sep 2020.

Vancouver:

Wang C. Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment. [Internet] [Doctoral dissertation]. Limoges; 2015. [cited 2020 Sep 20]. Available from: http://www.theses.fr/2015LIMO0058.

Council of Science Editors:

Wang C. Etude comparative des matériaux de garnissage dans les réacteurs de filtration pour l’assainissement non collectif : Comparative study of packing materials of filtration reactors for on-site wastewater treatment. [Doctoral Dissertation]. Limoges; 2015. Available from: http://www.theses.fr/2015LIMO0058

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