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The Oxidation of Arsenite by Aquatic Sediments¹

ABSTRACT

Sediments from five lakes in southern Saskatchewan, Canada, oxidize As(III) (arsenite) to As(V) (arsenate). The oxidation is not affected by flushing N₂ or air through the sediment suspensions, nor does the addition of HgCl₂ to the system eliminate the conversion of As(III) to As(V). The oxidation is an abiotic process with microorganisms playing a relatively minor role in this system. Because As(III) is more toxic and sorbed to a lesser extent by sediments than As(V), the suspended and bottom sediments may potentially alleviate the toxicity of As(III) through abiotic oxidation in aquatic environments.

Key Words: arsenic • abiotic oxidation • water quality • toxicity

¹ Contribution no. R255, Saskatchewan Inst. of Pedol., Univ. of Saskatchewan, Saskatoon, Canada. This investigation was supported by the Natural Sci. and Eng. Res. Counc. of Canada Grant A3248- and G0042-Huang and a Saskatchewan Res. Counc. Grant.

² Postdoctoral Fellow and Professor of Soil Science, Dep. of Soil Sci,, Univ. of Saskatchewan, Saskatoon S7N OWO; and Ecologist, Saskatchewan Fisheries Lab., Saskatchewan Dep. of Tourism and Renewable Resour., Saskatoon; respectively.

Received for publication December 18, 1979.

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