Evaluating arsenic availability in soils using DOWEX M4195, Fe3+ substituted, resin

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Authors:Miller, Clint; Herbert, Bruce
Author Affiliations:Primary:
Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States
Volume Title:Geological Society of America, 2008 annual meeting
Source:Abstracts with Programs - Geological Society of America, 40(6), p.135; Geological Society of America, 2008 annual meeting, Houston, TX, Oct. 5-9, 2008. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:2008
Note:In English
Summary:Arsenic is a common natural and anthropogenic contaminant in sediments, surface waters, and ground waters. In countries such as: Taiwan, Bangladesh, and the United States arsenic poisoning has been linked to disorders such as hyperpigmentation, Peripheral Vascular Disease, skin and bladder cancer, and gangrene. Complex geochemical and biological mechanisms control the distribution of arsenic within repositories in the biosphere, hydrosphere, and lithosphere. Arsenic in water is primarily found in two oxidation states, As (III) and As (V). As (III) is considered more toxic than As (V), and is generally less mobile. Controls on the distribution of arsenic include: redox conditions, pH, presence of Iron and Manganese Oxyhydroxides, and metabolic activities of microorganisms. Chemical availability of As is an indirect measure of bioavailability. It is assumed that dissolved phases are most bioavailable. Chemical availability of As is dependent on speciation. Therefore, when the speciation of arsenic in a soil system is known the chemical availability becomes a good indicator of bioavailability. In this study we use DOWEX M4195, Fe3+ substituted, chelating resin as an in-situ sink to measure arsenic chemical availability in natural soils in Taiwan and Texas. The resin will adsorb aqueous arsenate and arsenite acting as an artificial cell membrane. By using the resin as an in-situ sink we will be able to characterize arsenic speciation across a soils transect of varying pH with minimal perturbations to the system. Allowing the resin to remain in the soils will yield time-integrated As chemical availabilities. The chemical availability of arsenic in the soil waters will be recorded as total arsenic adsorbed to the resin. The goal of this project is to better understand arsenic availability via oxidation state in a natural soils environment. The DOWEX M4195, Fe3+ substituted, chelating resin method will be an effective measure for understanding arsenic contamination risks.
Subjects:Adsorption; Arsenates; Arsenic; Bioavailability; Controls; Eh; Ferric iron; Geochemistry; Ground water; Hydroxides; Iron; Manganese oxides; Measurement; Mechanism; Metabolism; Metals; Microorganisms; Oxidation; Oxides; Oxyhydroxides; PH; Pollutants; Pollution; Public health; Resins; Sediments; Soils; Solutes; Substitution; Surface water; Water pollution; Asia; Bangladesh; Far East; Indian Peninsula; Taiwan; Texas; United States
Record ID:2009084165
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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