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Spectroscopy Study of Arsenite [As(III)] Oxidation on Mn-Substituted Goethite

Published online by Cambridge University Press:  28 February 2024

Xiaohua Sun ,
Harvey E. Doner  and
Mavrik Zavarin
Xiaohua Sun
Affiliation:
Division of Ecosystem Sciences, Department of Environmental Science, Policy and Management, University of California at Berkeley, California 94720, USA
Harvey E. Doner
Affiliation:
Division of Ecosystem Sciences, Department of Environmental Science, Policy and Management, University of California at Berkeley, California 94720, USA
Mavrik Zavarin
Affiliation:
Division of Ecosystem Sciences, Department of Environmental Science, Policy and Management, University of California at Berkeley, California 94720, USA
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Abstract

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Mn-substituted goethite was synthesized and the interaction between arsenite (As(III)) and Mn-substituted goethite was investigated by both solution chemistry and X-ray adsorption near edge structure (XANES) spectroscopy. Results indicate that the oxidation of As(III) is favored by Mn-substituted goethite. This reaction was more sensitive to temperature than to pH. Different reaction mechanisms may account for As(III) oxidation. Since As(III) is more mobile and toxic than As(V), the oxidation reaction of As(III) with Mn-substituted goethite may decrease arsenic toxicity under some conditions.

Keywords

ArsenateArseniteMn-Substituted GoethiteOxidationXANES
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 4 , August 1999 , pp. 474 - 480
Copyright
Copyright © 1999, The Clay Minerals Society

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