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Dissertations / Theses on the topic 'Arsenic chemistry'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Hunt, Linda Elizabeth. "Dissolved arsenic in natural waters." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240582.

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2

Brown, Martyn A. "Phosphorus and arsenic carbohydrate derivatives." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU552502.

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A series of O-diphenylphosphinyl monosaccharide derivatives, e.g. 1,2:5,6-di-O-cyclohexylidene-3-O-diphenyl phosphinyl--D-glucofuranose [60], has been synthesised by reaction of a free hydroxy group in a sugar with Ph_2PCl. C-Diphenylphosphinyl and diphenylarsino derivatives, e.g. methyl 4,6-O-benzylidene-3-deoxy-3-C-diphenylarsino--D-altropyranoside [89], were synthesised via reaction of Ph2PLi or Ph2AsLi with p-tosyl, mesyl, epoxy or carbonyl substituted sugar reagents. Steric factors play a large part in determining the reactivity of the precursor sugars towards the phosphorous or arsenic n

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3

Durrant, Edward Earl 1967. "Electrochemical identification and determination of arsenic." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278322.

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The electrochemical behavior of the four arsenic species, As(III), As(V), monomethylarsonic acid (MMA), and dimethylarsinic acid (DMA), was examined at a gold disk electrode. The As(III) species in solution was determined by anodic stripping voltammetry. The experimental conditions that were established for this determination were employed for the determination of As(III) that was formed by the reduction of As(V) by glutathione. The presence of an Arsenic(III)-glutathione complex in solution was established by cyclic voltammetry.

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4

Healy, Sheila Marie. "Arsenic methylation in perspective." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289727.

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The following arsenite methyltransferase activities (U/mg) were measured in untreated mice: liver, 1.42 ± 0.17 (mean ± SEM); kidney, 0.62 ± 0.18; lung, 0.33 ± 0.08; testis, 1.21 ± 0.01. Arsenite methyltransferase metabolites were not detectable using guinea pig liver, kidney, lung or testis cytosol as the source of enzyme. A twofold increase in liver arsenite methyltransferase activity was observed in mice exposed to 28.6 mg sodium arsenite/L drinking water after 24 hr compared to control. Trivalent arsenic species were separated from pentavalent arsenicals in liver homogenates of hamsters inj

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5

Swarna, Anitha. "Removal of Arsenic Using Iron Coated Limestone." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1342.

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Arsenic contamination in drinking water is a severe problem worldwide. The best way to prevent hazardous diseases from chronic arsenic exposure is to remove the exposure. Efforts to remediate arsenic in drinking water have taken two tracks. One is to provide surface or shallow well water sources as an alternative to the arsenic contaminated deep wells. Another approach is to remove arsenic from the contaminated water. Different removal technologies like oxidation, chemical coagulation, precipitation, adsorption and others are available. There are problems and benefits associated with each of t

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6

Smith, Euan. "Chemistry of arsenic in soils of north-east New South Wales /." Adelaide, 1998. http://web4.library.adelaide.edu.au/theses/09ASOP/09asops646.pdf.

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7

Sánez, Juan. "Arsenic geochemistry and its impact in public health: the Bangladesh case." Revista de Química, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/99099.

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Considered the king of poisons, arsenic occurs naturally in the environment being present in air, soil, water and food. Its presence in drinking water is of global concern. Initial chronic exposure is manifested by skin lesions. Additionally, arsenic consumption impairs certain visceral organs: bladder, liver, prostate, etc. More over, arsenic is a recognized carcinogenic substance.When in Bangladesh started the program to lead safe drinking water in the 60’s, they never imagined the catastrophic consequences. Water wells were drilled in the whole country. The arsenic problem was recognized re

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8

Georgiadis, Myron. "Arsenic Speciation in Soils and Sediments." FIU Digital Commons, 2004. https://digitalcommons.fiu.edu/etd/3579.

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Arsenic speciation in soils and sediments pose a great challenge due to possible conversion and/or re-adsorption. Since arsenic toxicity is dependent on its chemical species, the purpose of this research is to study the extraction process, determine what factors control species change, and develop an extraction method which preserves the arsenic species during extraction for proper quantitation. After investigating the addition of reagents such as hydroxylamine and ethylenediamine-tetraacetic acid (EDTA) without significant improvement, a method was established for the extraction of mobile or

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9

Collins, Helen. "Halide transfer reactions of arsenic, antimony and bismuth." Thesis, University of Warwick, 1991. http://wrap.warwick.ac.uk/108064/.

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The study of Group 15 (As, Sb, Bi) halide exchange reactions. The Lewis acidity of SbCls was displayed using various metal halides. Treatment of the metal halides MCln (n=2, M=Mg, Sn; n=3, M=Sc, Y, La, Ti, In; n=4, M=Ti, Sn) with SbCls in MeCN provided antimonate(V) salts of the type [MCln-lL7-n][SbCl6] characterised by ^lgb nmr, electronic and infra-red spectroscopy and accompanying microanalytical data. Depending upon the stoichiometry of the reactants used the antimonate salts have been formulated as [MCln-xL6-(n-x)]x+[SbCl6]x‘ (where n=2, 3, 4; x=l, 2, 3). The formation of mono-, di- and t

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10

Cangelosi, Virginia May 1982. "Supramolecular coordination chemistry of phosphorus, arsenic, antimony, and bismuth with organothiolates." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/11301.

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xxiv, 203 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>The ever-expanding field of supramolecular chemistry has recently incorporated use of the main group ions. This dissertation presents a supramolecular approach to the coordination chemistry of the Group 15 elements, with a special emphasis on arsenic (As). Arsenic is ubiquitous in our environment, contaminates the drinking water of large human populations, and is a worldwide health concern. Arsenic's legendary toxicity is thought t

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11

Norris, Pauline Rose Hack. "Arsenic and Selenium Distribution in Coal-Fired Plant Samples." TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/52.

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Arsenic and selenium distributions in coal-fired plant samples are studied. This research includes arsenic and selenium concentrations in samples of coal, fly ash, bottom ash, economizer ash, Flue Gas Desulfurization (FGD) slurry and flue gas taken from four power plants with the goal being to examine the distribution of these metals in these materials and calculate a materials balance for the system. All samples were analyzed using ICP-ES. This research shows that 60-80% of the arsenic in coal-fired plant samples will be associated with the fly ash. Approximately 35-55% of the selenium will b

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12

Walrod, John Hamilton II. "ARSENIC REMOVAL WITH A DITHIOL LIGAND SUPPORTED ON MAGNETIC NANOPARTICLES." UKnowledge, 2017. http://uknowledge.uky.edu/chemistry_etds/83.

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Exposure to arsenic (As) in water, the ubiquitous toxin that poses adverse health risks to tens of millions, is the result of both anthropogenic and geochemical mobilization. Despite recent publicity and an increased public awareness, the dangers associated with arsenic exposure rank among the top priorities of public health agencies globally. Existing sequestration applications mainly include reductions and adsorption with zero-valent metals and their oxides. The performance of adsorption media is known to preferentially favor aqueous As(V) over As(III) due to the charge of the dissolved oxya

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13

Copping, Matthew C. "'Honour among professionals' : medicine, chemistry and arsenic at the fin de siecle." Thesis, University of Kent, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399593.

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14

Campbell, Andrew Thomas. "Some aspects of the aquatic and analytical chemistry of antimony and arsenic." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357182.

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15

Do, Clement. "EVALUATION OF A FILTRATION SORBENT FOR REMEDIATION OF ARSENIC IN GROUNDWATER." CSUSB ScholarWorks, 2017. https://scholarworks.lib.csusb.edu/etd/474.

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A commercially available product, PURA PhosLock, was identified and evaluated for use as a sorbent to remove dissolved arsenic (As) from drinking water. Although marketed as a product to remove phosphate in aquaria, it is composed of iron oxide hydroxide (i.e., FeO(OH)), which is also known to adsorb dissolved As species from water. Arsenic was measured using standard methods and Graphite Furnace Atomic Absorption Spectroscopy. A first rough filtration test was performed to see if the PhosLock adsorbed As well. About 50 g of PhosLock was used to filter 10 L of tap water containing 100 ppb As.

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16

Radabaugh, Timothy. "Oxidation and reduction of inorganic arsenic in mammalian systems." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280379.

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Arsenic is a toxic metalloid and is ubiquitous in our environment. In ancient cultures it was valued as a poison and today is becoming an increasing public health problem. Chronic arsenic exposure has a broad range of toxic effects including cancer. Currently millions of people are exposed to higher levels of arsenic in their food and drinking water than is considered safe by the World Health Organization. Although arsenic metabolism is not completely understood, it is known that inorganic arsenate is reduced to arsenite which can then be methylated and excreted in the urine. It is also known

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17

Hildum, Brendan. "Arsenic Speciation and Groundwater Chemistry at a Landfill Site: A Case Study of Shepley's Hill Landfill." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3234.

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Thesis advisor: Rudolph Hon<br>A groundwater plume beneath a capped landfill in north-central Massachusetts contains dissolved arsenic concentrations exceeding 10,000 ppb at several locations. The landfill closed in the early 1990's and contains minimally documented solid waste materials deposited over the course of nearly a century. The source(s), fate, and transport of arsenic in the landfill aquifer have been studied extensively over the past decade; however, the source and pathways of arsenic are not yet fully defined. The primary source of arsenic likely involves a combination of the land

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18

Schiller, Jana [Verfasser], and Manfred [Akademischer Betreuer] Scheer. "Phosphorus and Arsenic Based Ligands in Supramolecular Chemistry / Jana Schiller ; Betreuer: Manfred Scheer." Regensburg : Universitätsbibliothek Regensburg, 2021. http://d-nb.info/1234713136/34.

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19

Rodriguez-Ibarra, Veronica 1963. "Cyclic voltammetry of mercapto compounds and their reaction products with arsenic species." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278356.

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The electrochemical behavior of L-cysteine, 3-mercaptopropionic acid, dimercaptopropanesulfonic acid and dimercaptosuccinic acid, was examined at a mercury film electrode, gold electrode and platinum electrode. The effect of scan rate, pH and concentration were determined by cyclic voltammetry. The comparison of the cyclic voltammograms, established a great similarity among the monomercapto compounds at different molecular weight and structure and among the dimercapto compounds that were studied. Differences between the behavior of dimercapto and monomercapto compounds were also established. T

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20

Chen, Zhangrong. "Natural organic matter and colloid-facilitated arsenic transport and transformation in porous soil media." FIU Digital Commons, 2006. http://digitalcommons.fiu.edu/etd/2153.

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Prediction of arsenic transport and transformation in soil environment requires understanding the transport mechanisms and proper estimation of arsenic partitioning among all three phases in soil/aquifer systems: mobile colloids, mobile soil solution, and immobile soil solids. The primary purpose of this research is to study natural dissolved organic matter (DOM)/colloid-facilitated transport of arsenic and understand the role of soil derived carriers in the transport and transformation of both inorganic and organoarsenicals in soils. DOM/colloid facilitated arsenic transport and transformatio

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21

Riddick, Eugenia. "Analysis of Dissolved Organic Matter and Inorganic Arsenic III/V in Drinking Water." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1413471413.

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22

Zhang, Nianliu. "Understanding Environmental Reactions of Carbon Tetrachloride, Trichloroethylene, Perchloroethylene, and Arsenic Applying Computational Chemistry Methods." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195287.

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In recent years, as the progress of computational abilities has increased, computational chemistry has become an interesting tool for researchers for investigating mechanisms of environmental reactions when results of experimental explorations are not sufficiently clear. In this research, several environmental reactions have been investigated using ab initio and density functional theory (DFT) methods.This research investigated the effect of the reaction energy on the reaction pathway for C-Cl bond cleavage in carbon tetrachloride (CT). Ab initio and density functional theories were used to st

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23

Smith, Euan. "Chemistry of arsenic in soils of north-east New South Wales / by Euan Smith." Thesis, Adelaide, 1998. http://hdl.handle.net/2440/22476.

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Bibliography: leaves 137-151.<br>xiii, 151 leaves : ill. ; 30 cm.<br>Ten soils from northern New South Wales, Australia, were sampled and assessed for their capacity to sorb arsenate (Asv) in relation to soil properties.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Soil Science, 1998

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24

Wangkarn, Sunanta. "Development of hyphenated analytical techniques for arsenic speciation in environmental and biological matrices." Thesis, Birkbeck (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342227.

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25

Eroglu, Ozcan Sefika. "Arsenic Speciation In Fish By Hplc-icp-ms." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612704/index.pdf.

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ABSTRACT ARSENIC SPECIATION IN FISH BY HPLC-ICP-MS &Ouml<br>ZCAN, Sefika Eroglu M.S., Department of Chemistry Supervisor: Prof. Dr. O. Yavuz ATAMAN September 2010, 103 pages Arsenic speciation in fish samples on the market was performed using isocratic elution with cation exchange column high performance liquid chromatography (HPLC) with inductively coupled plasma mass spectrometry (ICP-MS) detection. Total As concentrations were found by ICP-MS using samples digested by nitric acid-hydrogen peroxide solution using microwave oven digestion<br>the results were in the range of 1.15-12.6

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26

Yang, Mingwei. "In Situ Arsenic Speciation using Surface-enhanced Raman Spectroscopy." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3387.

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Arsenic (As) undergoes extensive metabolism in biological systems involving numerous metabolites with varying toxicities. It is important to obtain reliable information on arsenic speciation for understanding toxicity and relevant modes of action. Currently, popular arsenic speciation techniques, such as chromatographic/electrophoretic separation following extraction of biological samples, may induce the alternation of arsenic species during sample preparation. The present study was aimed to develop novel arsenic speciation methods for biological matrices using surface-enhanced Raman spectrosc

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27

Dickson, Dionne. "The Effect of Iron Oxide Nanoparticles on the Fate and Transformation of Arsenic in Aquatic Environments." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/858.

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Iron oxides and arsenic are prevalent in the environment. With the increase interest in the use of iron oxide nanoparticles (IONPs) for contaminant remediation and the high toxicity of arsenic, it is crucial that we evaluate the interactions between IONPs and arsenic. The goal was to understand the environmental behavior of IONPs in regards to their particle size, aggregation and stability, and to determine how this behavior influences IONPs-arsenic interactions. A variety of dispersion techniques were investigated to disperse bare commercial IONPs. Vortex was able to disperse commercial hemat

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28

Brisdon, A. K. "Matrix isolation infra-red and mass spectrometric studies of some arsenic and selenium oxides." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232998.

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29

Mukherjee, Abhijit. "DEEPER GROUNDWATER FLOW AND CHEMISTRY IN THE ARSENIC AFFECTED WESTERN BENGAL BASIN, WEST BENGAL, INDIA." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/368.

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Natural attenuation of trichloroethene (TCE) and technetium (99Tc) was studied for five consecutive seasons (from January 2002 to January 2003) in Little Bayou Creek. The stream receives ground water discharge from an aquifer contaminated by past waste disposal activities at the Paducah Gaseous Diffusion Plant (PGDP), a uranium enrichment facility near Paducah, Kentucky. Results from stream gaging, contaminant monitoring, tracer tests (with bromide, nitrate, rhodamine WT and propane) and simulation modeling indicate the TCE is naturally attenua

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30

Stice, Szabina A. "Speciation, Metabolism, Toxicity, and Protein-binding of Different Arsenic Species in Human Cells." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1203.

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Despite of its known toxicity and potential to cause cancer, arsenic has been proven to be a very important tool for the treatment of various refractory neoplasms. One of the promising arsenic-containing chemotherapeutic agents in clinical trials is Darinaparsin (dimethylarsinous glutathione, DMAIII(GS)). In order to understand its toxicity and therapeutic efficacy, the metabolism of Darinaparsin in human cancer cells was evaluated. With the aim of detecting all potential intermediates and final products of the biotransformation of Darinaparsin and other arsenicals, an analytical method employ

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31

Jana, Partha. "REMOVAL OF ARSENIC(III) FROM WATER WITH A NEW SOLID-SUPPORTED THIOL." UKnowledge, 2012. http://uknowledge.uky.edu/chemistry_etds/11.

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Arsenic is a highly toxic, easily transportable and widespread contaminant in groundwater throughout the world. Arsenic causes acute toxicity by disrupting biological functions. In groundwater arsenic concentrations can reach up to a few milligrams per liter. Current regulations on arsenic content in drinking water are becoming more stringent and require the standard to be reduced to a few parts per billion. Arsenic exists as oxyanions in aqueous solution in either trivalent or pentavalent oxidation states depending on the oxidation-reduction potential and pH of the medium. Several treatment m

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32

Sowder, Jonathan T. "The origin and fate of arsenic in coalbed natural gas produced water ponds." Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1935323111&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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33

Johnson, Linda Rosemary. "The chemical speciation and transformations of arsenic in humans and in the environment." Thesis, University of Glasgow, 1986. http://theses.gla.ac.uk/2547/.

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The human metabolism and biotransformation of arsenic were studied by the analytical speciation of urinary arsenic excreted by volunteers in a series of laboratory-controlled experiments, the general population and several groups subject to enhanced environmental or occupational exposure to inorganic arsenic. In additon, the post-depositional remobilisation of arsenic in the aquatic environment was investigated by the establishment of the chemical forms of arsenic in the sediment porewaters of Loch Lomond and the Dubh Lochan and in the sediments of nearby Scottish sealochs. Total arsenic conce

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34

Almassalkhi, Brittany A. "Arsenic Speciation, Detection, and Quantification in Drinking Water using High Performance Liquid Chromatography and Inductively Coupled Plasma Mass Spectrometry." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258580087.

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35

Lumsdon, David G. "A study of arsenate adsorption on goethite (α-FeOOH) in relation to selected ions". Thesis, University of Aberdeen, 1986. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=215999.

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Infrared spectroscopy was used to show that the arsenate anion is adsorbed on the surface of synthetically prepared goethite, replacing two singly coordinated (A-type) surface OH groups. In this respect, arsenate is analogous to phosphate, but its larger size causes it to interact more strongly with other OH groups that remain on the surface. This has suggested an alternative infrared band assignment for these OG groups. Potentiometric titrations performed on 'CO<SUB>2</SUB>'-free goethite gave a value for the point of zero charge (p.z.c.) of 9.15. The p.z.c. shifted to more acid values for ph

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36

Kubachka, Kevin M. "Elemental Speciation Analysis of Arsenic, Selenium and Phosphorus: Exploring Foods and Plants." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1180714534.

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37

Jones, Morgan Liane. "A Novel Pervious Cement Reaction Barrier (PCRB) in Situ Arsenic Remediation System." TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/169.

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38

Aysegul, Sezdi. "Separation Of Arsenite And Arsenate Species From Water By Charged Ultrafiltration Membranes." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614382/index.pdf.

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Arsenic is found in drinking waters in many countries and since maximum allowable concentration is as low as 10 &micro<br>g/L, there are many research efforts to separate it from water. Membrane methods are used more and more widely in separation operations in recent years. Arsenic is mainly present in water as arsenite [As(III)] and arsenate [As(V)]. As pH of water changes, molecular formulas of As(III) and As(V) change. In this study, the performance of different ultrafiltration membranes for arsenic removal from water was investigated at different pH values, different feed concentrations

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39

Sandhi, Arifin. "ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT : A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS." Doctoral thesis, KTH, Mark- och vattenteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203995.

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Use of arsenic-rich groundwater for crop irrigation can increase the arsenic (As) content in food crops and act as a carcinogen, compromising human health. Using aquatic plant based phytofiltration is a potential eco-technique for removing arsenic from water. The aquatic moss species Warnstorfia fluitans grows naturally in mining areas in northern Sweden, where high concentrations of arsenic occur in lakes and rivers. This species was selected as a model for field, climate chamber and greenhouse studies on factors governing arsenic removal and arsenic phytofiltration of irrigation water. The a

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40

Hartley, William. "A study of novel methods for the in situ remediation of arsenic contaminated soils." Thesis, Liverpool John Moores University, 2002. http://researchonline.ljmu.ac.uk/4998/.

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41

Bhandari, Narayan. "Investigations of the (Photo)Chemistry of Nano- and Micron-dimensioned Iron Oxides for Metal(loid) Remediation." Diss., Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/225174.

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Chemistry<br>Ph.D.<br>Anthropogenic activities and natural processes over time have led to the release of toxic heavy metal contaminants into the environment. As a consequence, there is an increasing number of illnesses caused by the exposure of humans to heavy metals and metalloids. The dissertation work presented here focused on the synthesis, characterization, and understanding of the surface chemistry, as well as the photo-reactivity, of a variety of iron (oxyhydr)oxide nano-materials that have relevance for the remediation of heavy metal contaminants, such as arsenic and chromium in aqueo

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42

Gulina, L. B., and V. P. Tolstoy. "As2S3 Thin Films Synthesized in “Soft Chemistry” Conditions and Microtubules From Them." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35003.

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For the first time the conditions of synthesis As2S3 microtubules were defined. Investigation of the synthesized scroll-like structures was carried out by optical microscopy, scanning electron microscopy, electron microprobe analysis, X-ray diffraction, and Raman spectroscope. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35003

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43

Chitta, Karnakar Reddy. "Selenium mediated arsenic toxicity modifies cytotoxicity, reactive oxygenspecies and phosphorylated proteins." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367942581.

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44

Donahue, Courtney Margaret. "Ligand K-edge XAS studies of arsenic-sulfur and metal-phosphorus bonds, and synthetic explorations of 1,8,10,9-triazaboradecalin and related complexes." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6406.

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Ligand K-edge X-ray absorption spectroscopy (XAS) is an experimental method that can quantify variations in covalent bonds and electronic structure in coordination complexes. A review of ligand K-edge XAS with emphasis on known P K-edge XAS studies of metal phosphine complexes is reviewed, followed by a description of how this method was used to investigate how ligand and structural variations affect As-S and M-P bonding. These studies were aimed at understanding how changes in As-S bonds are implicated in As toxicity and remediation, and developing structural diphosphine models that predict h

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45

Blue, Lisa Y. "IMMOBILIZATION OF MERCURY AND ARSENIC THROUGH COVALENT THIOLATE BONDING FOR THE PURPOSE OF ENVIRONMENTAL REMEDIATION." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/785.

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Mercury and arsenic are widespread contaminants in aqueous environments throughout the world. The elements arise from multiple sources including mercury from coal-fired power plants and wells placed in natural geological deposits of arseniccontaining minerals. Both elements have significant negative health impacts on humans as they are cumulative toxins that bind to the sulfhydryl groups in proteins, disrupting many biological functions. There are currently no effective, economical techniques for removing either mercury or arsenic from aqueous sources. This thesis will demonstrate a superior r

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46

FRICKE, MICHAEL WILLIAM. "SYNTHESIS OF ORGANOARSENIC COMPOUNDS FOR ELEMENTAL SPECIATION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1078519638.

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47

Barquist, Karna Nicole. "Synthesis and environmental adsorption applications of functionalized zeolites and iron oxide/zeolite composites." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/334.

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Silicalite-1 crystals and hollow tube structures were synthesized and functionalized with amine and sulfur containing groups. The adsorption behavior of metal ions (Pb2+, CrO4-) in aqueous solution was investigated on nanocrystalline zeolites functionalized with amines and thiols. Nanocrystalline zeolites with a diameter of 30-50 nm and external surface areas around 100 m2/g were functionalized with 3-aminopropyltriethoxysilane (3-APTES) and 3-mercaptopropyltrimethoxysilane (3-MPTMS). The materials were characterized by 29Si magic angle spinning nuclear magnetic resonance spectroscopy and x-ra

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48

Davis, Christina Clarkson. "Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33948.

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Aqueous silica is present in all natural waters and exhibits a high affinity for the surfaces of iron oxides. Therefore, it is expected to play an important role in environmental systems. Experiments were conducted to investigate the fundamentals of silica sorption onto pre-formed ferric hydroxide at pH 5.0-9.5 and silica concentrations of 0-200 mg/L as SiO<sub>2</sub>. Over the entire pH range studied, sorption densities exceeding monolayer sorption were observed at silica levels typical of natural waters. Under some circumstances, sorption exceeded a monolayer while the particle zeta pot

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49

Schmidt, Lilian Olga. "Aspects of the determination of the platinum group elements and arsenic by inductively coupled plasma mass spectrometry." Thesis, Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-02242006-123310/.

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50

Wen, Ying. "Approach to Arsenic and Selenium Removal from Fly Ash by Oxalate and Estimation of Calcium Effects on Both Elements." TopSCHOLAR®, 2011. http://digitalcommons.wku.edu/theses/1046.

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An approach to arsenic and selenium removal from fly ash is studied. This research includes a comparison of the leaching ability of ammonium oxalate, ammonium citrate, ammonium nitrate and EDTA to extract arsenic and selenium; use of common agricultural waste as a source of oxalate anion to remove arsenic and selenium from fly ash and estimation of additional calcium effects on arsenic and selenium leaching behaviors. This research shows that extraction strength order is EDTA > ammonium oxalate > ammonium citrate > ammonium nitrate > water, achieving arsenic extraction efficiencies of 94.18%,

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