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ABIOTIC REDUCTION AND DETOXIFICATION OF CHROMATE PRESENT IN SOILS
Citation:
Khan*, F A. AND R W. Puls*. ABIOTIC REDUCTION AND DETOXIFICATION OF CHROMATE PRESENT IN SOILS. Presented at ASA, CSSA, SSSA Anual Meetings, Salt Lake City, UT, 10/31-11/4/1999.
Description:
Theoretical and experimental research has supported the assertion that Cr(III) species are the most stable, immobile, and nontoxic forms of chromium and that they may form rapidly when adequate reducing agents are introduced in an oxidized soil environment. The objective of this study was to evaluate potential reductants and their effectiveness in reducing Cr(Vl)-contaminated soil or sediment samples collected from the vadose zone beneath the plating shop area of the U.S. Coast Guard Support Center at Elizabeth City. NC. The reductants evaluated were sodium dithionite. I- ascorbic acid, and hvdroxylamine. These reductants reduced chromate present in the vadose materials, and each provided a unique geochemical environment. Sodium dithionite proved to be the most effective reductant to detoxify chromate present in the vadose zone materials. This research will contribute to the development of a cost-effective remedial design to attenuate redox-sensitive contaminants present in vadose zones.