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DISTRIBUTION, SPECIATION, AND TRANSFORMATION OF CHROMIUM IN CONTAMINATED SOILS AND AQUIFER SEDIMENTS
Citation:
Puls, R., D. Clark, AND C. Paul. DISTRIBUTION, SPECIATION, AND TRANSFORMATION OF CHROMIUM IN CONTAMINATED SOILS AND AQUIFER SEDIMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/084 (NTIS PB92179092).
Description:
The chemical speciation and distribution of chromium on unsaturated contaminated soils, and saturated aquifer sediments was analyzed in the vicinity of a chrome plating operation. equential extractions and selective ion exchange experiments were performed to infer mineral fractions responsible for retention of the chromium on the solid phase, and the chemical form (speciation) of the retained chromium. eduction of Cr(VI) to Cr(III) and subsequent precipitation as (Fe,Cr) (OH)3 is proposed as the primary attenuation mechanism in the unsaturated soils immediately beneath the shop. hromium reduction in the saturated aquifer sediments is significantly less effective in attenuation of the delineated Cr(VI) ground-water plume. canning electron microscopy with energy dispersive X-ray analyses, and cursory modelling efforts with CHROMAT were also used to complement wet chemical methods in assessments of chromium transport and transformation.