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Dissertations / Theses on the topic 'Speciation of arsenic'

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Published: 4 June 2025

Last updated: 1 August 2025

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1

Branch, Simon. "Arsenic speciation in food." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2138.

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A high performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS) method has been developed for the separation and quantification of ~g kg-1 levels of arsenobetaine, monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA) , arsenite and arsenate. Using this coupling, arsenic species in fruit and vegetables grown on soils containing up to 1.4% w\w arsenic have been surveyed and DMAA, MMAA, arsenite and arsenate identified in the plants. Although extraction efficiencies were poor, typically 10%, total arsenic determinations demonstrated that arsenic uptake by

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2

Montilla, Alfonso. "Sample treatment for arsenic speciation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0010/MQ60154.pdf.

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3

Sadee, Bashdar. "Total arsenic and arsenic speciation in indigenous food stuffs." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/4583.

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The properties of an element are highly dependent on its chemical form, it’s called elemental speciation. This study evaluates the arsenic species found in a range of food stuffs together with growing environments and toxicity issues. Total arsenic concentrations in fish tissue and vegetable crops were determined by ICP-MS following microwave-assisted acid digestion using nitric acid/hydrogen peroxide, trypsin and cellulase enzymatic extraction procedures. The extracted arsenic species were then quantified using HPLC-ICP-MS. A dilute nitric acid (1 % (v/v)) digestion procedure was also used to

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4

Aborode, Fatai Adigun. "Selenium and arsenic speciation in plants." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201647.

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Selenium and arsenic are important metalloids in the food chain from nutritional and toxicological point of view. These two metalloids are potentially enriched through geogenic processes and anthropogenic activities and they could sometimes co-exist in nature and become available to plants thereby entering the food chain. While selenium is known as an essential element to humans, it could also be toxic. Arsenic on the other hand is a potentially toxic element posing serious health risks to livestock and humans. They have been found to neutralise each other’s effects in animals but their intera

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5

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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6

Hasegawa, Hiroshi. "Seasonal Changes in Arsenic Speciation in Hydrosphere." 京都大学 (Kyoto University), 1997. http://hdl.handle.net/2433/202482.

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7

Vagliasindi, Federico G. A. "Arsenic speciation and removal in adsorption systems /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/10208.

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8

D'Arcy, Karen Ann. "Electrochemical methods for speciation of inorganic arsenic." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/524.

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Arsenic is found in the environment in several oxidation states as well as in a variety of organoarsenic compounds. This situation puts additional demands on the analysis in that it is desirable to measure the amount of each species, not just all of the arsenic. The reason for this is that the different species have greatly different toxicities; of the major inorganic forms, As(III) is much more toxic than As(V). The goal of this research was to develop a convenient method for the analysis of mixtures of As(III) and As(V) at trace levels. Electroanalytical methods are inherently sensitive to o

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9

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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10

Bergqvist, Claes. "Arsenic accumulation in various plant types." Licentiate thesis, Stockholms universitet, Botaniska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64142.

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11

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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12

Taebunpakul, Sutthinun. "Arsenic speciation analysis in food-related and environmental samples." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6858.

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Metallomics approaches based on the combined use of elemental and molecular mass spectrometry for arsenic speciation analysis in phytoremediating plants, marine algae, cut tobacco and cigarette smoke total particulate matter have been developed. Size-exclusion chromatography (SEC)-ICP-MS is proposed to use as a powerful tool for selecting both the appropriate extractant as well as optimum extraction conditions. Comparative SEC-ICP-MS As profiles and total As concentrations in the extracts were used to identify the optimum condition for As speciation studies as a compromise between extraction e

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13

Lambkin, Denise Caroline. "Speciation and bioavailability of arsenic and cadmium in contaminated soils." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286150.

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14

Dodd, Matthew. "Arsenic speciation studies on some marine invertebrates of British Columbia." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28664.

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Graphite furnace and hydride generation atomic absorption, GFAA and HGAA, techniques have been developed and applied to the determination of arsenic concentrations in some marine invertebrates, mainly bivalves and gastropods, of British Columbia. Total arsenic concentrations in bivalves vary with species, ranging from 0.6-9.1 μg g⁻¹ (wet weight basis). Arsenic concentrations in the bivalve shells show a wider range of 0.1 to 26.3 μg g⁻¹ (dry weight basis). Gastropods show relatively higher arsenic concentrations in the soft tissues, 17.3-48.4 fig μg g⁻¹, and concentrations in the shells range

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15

Shi, Youqing. "Speciation of arsenic by chemical separations and neutron activation analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ66671.pdf.

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16

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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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

Newcombe, Christopher Richard. "Speciation analysis of mammalian arsenic urinary metabolites and characterisation of lipid soluble arsenic compounds in Laminaria digitata." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=158609.

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This thesis describes a series of experiments, firstly into mammalian arsenic urinary metabolites and secondly into the use of phospholipase enzymes as a tool to assist in the characterisation of lipids extracted from the seaweed, <i>Laminaria digitata</i>. HPLC-ICP-MS has been used as the principal analytical instrument, often coupled with ES-MS. The ICP-MS. Provides a ‘hard’ ionisation process and yields data specific to arsenic. ES-MS (electrospray mass spectrometry) is a ‘soft’ ionisation technique that allows analysis of the intact molecules. Analysis of the urine from Scottish Blackface

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19

Lovell, Martyn Andrew. "Arsenic cycling in the freshwater sediments of Loch Lomond and some analytical speciation studies of arsenic metabolism." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254228.

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20

Niu, Lijie. "Arsenic Distribution and Speciation in Antigorite-Rich Rocks from Vermont, USA." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20204.

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Summary Serpentinites from the northern Vermont were examined for the distribution and abundance of As. XRD and electron microprobe showed the samples are composed of antigorite, chromite, magnetite, and carbonate minerals (magnesite, dolomite, calcite). The concentration in As when the samples were dissolved in H3PO4 was 10% of the concentration in As when the samples were dissolved in concentrated HF/HNO3, suggesting that As is mainly incorporated in the structure of antigorite. X-ray absorption near-edge structure spectra showed that the As is As(III) in the samples. Extended X-ray absorpt

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21

Fitzpatrick, Sarah Anne. "Speciation analysis of arsenic and selenium by HPLC and mass spectrometry." Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/2702.

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New methodologies have been developed for the determination of arsenic and selenium species in a variety of environmentally important matrices. A simple liquid chromatographic separation technique based upon mini-column technology was developed to obtain a simultaneous, fast, efficient and reliable separation of relatively toxic from relatively non-toxic arsenic and selenium species. The relatively toxic arsenic and selenium species studied were inorganic Asv, AsIII, SeVI and SeIV. The relatively non-toxic species of arsenic and selenium studied were AsBet, DMA and Se Met. Optimum conditions w

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22

Williams, P. N. "Arsenic speciation and concentration in paddy rice : consequences for dietary exposure." Thesis, University of Aberdeen, 2007. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602369.

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Chapter 1. Introduction General summary covering the toxicity and environmental distribution of arsenic, rice cultivation in Bangladesh including irrigations practices, previous knowledge of arsenic concentration and speciation in rice and the risk posed to the human food chain. Chapter 2. Variation in arsenic speciation and concentration in paddy rice related to dietary exposure Arsenic speciation was surveyed in different rice varieties from different parts of the globe to understand the contribution of rice to arsenic exposure. Pot experiments were utilised to ascertain whether growing rice

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23

Brown, Angela Meagan. "Arsenic speciation in the presence of anoxic mixed valent iron systems." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/784.

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Iron is ubiquitous in the environment, ranking fourth in abundance in the earth's crust. Iron is responsible for many environmental mechanisms including the distribution of plant nutrients and pollutants. Iron can exist in several minerals, including iron oxides. Arsenic is a naturally occurring metalloid which has been confirmed by the EPA as a carcinogen. Recently, an arsenic epidemic has unfurled in Bangladesh, poisoning an estimated 70 million people. Arsenic contamination does not exist only in the third world, but also in the United States, including Iowa. Due to the widespread distribut

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24

Seiter, Jennifer M. "The fate and speciation of arsenic in soils and poultry production systems." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 327 p, 2009. http://proquest.umi.com/pqdweb?did=1833621191&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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25

Beak, Douglas Gerald. "Lead and arsenic speciation and bioaccessibility following sorption on oxide mineral surfaces." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1131933545.

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26

Kubachka, Kevin Michael. "Elemental speciation analysis of arsenic, selenium, and phosphorus exploring foods and plants /." Cincinnati, Ohio : University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1180714534.

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Thesis (Ph. D.)--University of Cincinnati, 2007.<br>Title from electronic thesis title page (viewed Oct. 8, 2007). Includes abstract. Keywords: selenium, phosphorus, arsenic, speciation ICP-MS. Includes bibliographical references.

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27

Thongkon, Nisakorn. "Method development for the speciation analysis of chromium, organotin and arsenic compounds." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364913.

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28

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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29

Naught, Laura Eisinger. "Arsenic speciation of swine urine for possible use in human exposure assessments." Thesis, University of Missouri - Columbia, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3577952.

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<p> Millions of people are exposed to arsenic in the United States and worldwide. Commonly found arsenic species in human urine are AsIII (arsenite), AsV (arsenate), MMA (monomethyl arsenic acid), DMA (dimethylarsinic acid) and AB (arsenobetaine). Evidence has shown that these species vary in toxicity, and since each of these metabolites can be detected through analysis, they have the potential to be used as biomarkers for human exposure. For human exposure assessments in areas that have naturally occurring arsenic contaminated sources, or those who live or work near contaminated environmental

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30

Navrátilová, Jana. "Metody speciační analýzy sloučenin arsenu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-233337.

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Speciační analýza arsenu v různých matricích s využitím HPLC/ICPMS byla předmětem této práce. Toxicita arsenu závisí na oxidačním stavu a formě, ve které je přítomen. Znalost zastoupení specií arsenu je nutná k hodnocení toxicity a biodostupnosti. Obecně, anorganické specie jsou více toxické než organické. V práci byla studována degradace arsenocukrů v mořských řasách za simulovaných přirodních podmínek. Původní arsenocukry byly transformovány na arseničnan a kyselinu dimethylarseničnou. Arsen vstupuje do rostlin z půdy a vody a následně může vstoupit do potravního řetězce. S ohledem na tuto s

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31

Diesel, Elizabeth A. "The Effect of Speciation and Form on the Bioavailability of Arsenic: Insight into the Behavior of Arsenic in Natural Waters." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37383.

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Drinking water supplies contaminated with arsenic (As), a toxin and carcinogen, adversely impact the health of millions of people worldwide. Previous work has documented that different inorganic and organic As species vary with respect to their toxicities. It is, however, currently not well understood how As speciation affects bioavailability, defined as the capacity of a contaminant to cross an organismâ s cellular membrane, or how arsenicâ s form (dissolved vs. non-dissolved) can affect bioavailability. This dissertation addresses the effect of speciation and form on As bioavailability thr

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32

Momplaisir, Georges-Marie. "Development of analytical methods for the speciation of arsenic in the marine environment." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40201.

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Several biologically important arsenic compounds including methylarsonate, trimethylarsine oxide, tetramethylarsonium ion, arsenobetaine and arsenocholine were prepared, in good yields, from sodium arsenite, or dimethylarsinic acid. These organoarsenic compounds together with arsenite, arsenate and dimethylarsinic acid were used as standards for the development of analytical methods for determining the levels of individual arsenic compounds (arsenic speciation) present in natural matrices.<br>Arsenobetaine, arsenocholine and tetramethylarsonium ion were separated by high performance liquid chr

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33

Morillo, Martín Diego. "Superparamagnetic iron oxide nanoparticles as arsenic adsorbent. Development of Nanofiber SPION Supports and Arsenic Speciation Using Synchrotron and Hyphenated Techniques." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/129335.

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Los estudios que se han realizado en la presente tesis doctoral se basan en el desarrollo de una metodología de síntesis y caracterización de sistemas nanoestructurados como recurso innovador para la recuperación de arsénico en efluentes contaminados y la depuración de dichos efluentes. Estos materiales tienen como elemento común, el uso de las Superparamagnetic Iron Oxide Nanoparticles (SPION), con las que se han realizado diferentes estudios de adsorción para evaluar los parámetros de adsorción óptimos (tiempo de contacto, efecto del pH y de la concentración). Dichos estudios han permi

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34

Bhowmick, Subhamoy. "Arsenic and its speciation analysis in biological and environmental samples using ICP techniques." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/125307.

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Arsenic (As) is one of the common cancers causing contaminant in groundwater of West Bengal, India along with other regions of the world. Scientists believe that As contamination in groundwater of these region are because of the reductive dissolution of iron oxyhydroxide and the oxidation of organic matter. However, our research shows that a combination of carbonate mineral dissolution and the reduction of iron oxyhydroxides accounts for the high As concentration in groundwater. Thus the people of this region are exposed daily to high levels of As through various pathways. Our study on saliva

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35

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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36

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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37

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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38

Stevens, Brooke Nan. "Bioaccessibility, Bioavailability, and Chemical Speciation of Arsenic in Contaminated Soils and Solid Wastes." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469101685.

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39

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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40

Urban, David Raymond. "A kinetic investigation of As and Se speciation within coal combustion flue gases using ab initio methods." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-042806-133423/.

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41

Kroening, Karolin. "Small to large molecule speciation: Metallomics approaches stretch the horizons." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291050537.

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Panther, Jared Graeme. "Diffusive Gradients in Thin Films for Inorganic Arsenic Speciation and Electrothermal Atomic Absorption Spectrometry with a Coupled Microcolumn for Trace Metal Speciation." Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/3675.

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This thesis is directed towards the development of the diffusive gradients in thin films (DGT) technique for the measurement of total dissolved As, and for As speciation measurements. In addition, a preliminary investigation of a novel laboratory-based method for measuring labile metal species was carried out; this method involved the coupling of a microcolumn of adsorbent with a standard electrothermal atomic absorption spectrometer. An iron-oxide adsorbent was utilized for As measurements by DGT. The diffusion coefficients of inorganic Asv and AsIII> were measured through the polyacrylamide

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Ore, Christopher M. "The role of microbial growth on arsenic release and speciation in acid mine damage." abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1433409.

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44

Farnfield, Hannah Rose. "Arsenic (total and speciation) in water from Argentina and its impact on human health." Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582598.

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Elevated arsenic concentrations in ground and surface water sources have been reported world-wide. Furthermore, arsenic exposure has been associated with several health disorders including type-2 diabetes. However, research in Argentina is limited and is typically confined to. a few provinces (e.g. Santiago del Estero; Cordoba and Buenos Aires). This research aimed to evaluate the relationship between arsenic exposure in water and levels in human hair, fingernail and toenail samples from four locations in Argentina, General Roca (Rio Negro), Los Menucos (Rio Negro), Eduardo Castex (La Pampa) a

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Yathavakilla, Santha Venkata. "Speciation of Selenium, Mercury and Arsenic in Food by Inductively Coupled Plasma Mass Spectrometry." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179516979.

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46

Niazi, Nabeel Khan. "Variability, Speciation and Phytoremediation of Soil Arsenic at Cattle Dip Sites in NSW, Australia." Thesis, The University of Sydney, 2011. http://hdl.handle.net/2123/8047.

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Arsenic (As) contamination of soils is a major environmental problem due to its toxic and carcinogenic nature. Historical use of As-containing pesticides has resulted in the contamination of soils with high and variable concentrations of As in many parts of Australia. Phytoremediation using As-hyperaccumulating ferns can be potentially utilised as an environmental friendly and low-cost remediation technology to phytoextract As from soils at sites containing elevated and varying concentration of As. The spatial variability of total and phosphate-extractable As concentrations was evaluated in so

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Tanamal, Claudia. "The Impacts of Legacy Mining Operation on Inorganic Arsenic Bioaccumulation and Exposure in Yellowknife, Northwest Territories, Canada." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39916.

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Arsenic transfers and toxicology are important topics of research and a public health concern because arsenicosis affects millions of people worldwide every year. One of the most significant sources of arsenic in the environment is industrial wastes, such as by-products of mining operation. In Yellowknife, Northwest Territories, Canada, there were two large gold mines—Giant Mine and Con Mine, along with dozens of small-scale mines. The combined by-product of emission from these roasters might have contributed to high concentrations of arsenic found in the city. This thesis presents the results

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Reis, Vanessa Alexandra Teixeira. "Contribution for assessment of arsenic accumulation and development of a speciation method in an algae production process." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22705.

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Mestrado em Biotecnologia<br>O crescente aumento no interesse de consumo de algas marinhas devido aos respetivos benefícios nutricionais, tem realçado a preocupação com a saúde humana devido à eventual presença de contaminantes e substâncias indesejáveis, nomeadamente o arsénio (As). O presente trabalho reporta o estudo da bioacumulação de arsénio por macroalgas (Fucus vesiculosus, Ulva rigida, Porphyra dioica e Gracilaria sp.) cultivadas de forma sustentável num sistema de aquacultura multi-trófica integrada (IMTA) operado pela empresa, ALGAplus, Lda. O interesse pela determinação de As ino

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Bennett, William W. "Development of the Diffusive Gradients in Thin Films Technique for the Measurement of Inorganic Arsenic Speciation in Water and the Investigation of Arsenic Sediment Biogeochemistry." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/365634.

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A novel diffusive gradients in thin films (DGT) technique for the measurement of inorganic arsenic speciation in situ was developed and evaluated. In addition, a diffusive equilibration in thin films (DET) technique was optimized for the high-resolution, colorimetric measurement of iron(II) in sediment porewaters. These techniques were then utilized to investigate processes of arsenic mobilization in sediments and the effect of changing redox conditions on the cycling of arsenic in freshwater and marine sediments. A titanium dioxide-based adsorbent, Metsorb™, was evaluated as a DGT adsorbent f

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Mahmood, Arshad. "Literature study on sample preparation and storage for speciation analysis of arsenic in aqueous solutions." Thesis, Umeå universitet, Kemiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-55723.

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The purpose of this literature review is to make a compilation of which kind of general procedures and preservatives have been used in previous studies to stabilize arsenic species As(III) and As(V) especially inorganic in aqueous samples for a certain known period. The role of various preservatives like different mineral acids, EDTA, EDTA-HAc, selection of their concentration according to sample matrix especially considering Fe, Mn, Ca and microorganisms to get maximum desirable stability results are studied. pH is also an important factor which is responsible for oxidation and reduction of A

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