The Geochemistry of Chromium Migration and Remediation in the Subsurface
作者： Andy Davis , Roger L. Olsen
DOI: 10.1111/J.1745-6584.1995.TB00022.X
关键词: Batch test 、 Environmental engineering 、 Nuclear chemistry 、 Oxidizing agent 、 Aquifer contamination 、 Adsorption 、 Chromium 、 Soil water 、 Environmental remediation 、 Precipitation (chemistry)
摘要: From a human health perspective, knowledge of Cr speciation in soils is important assessing risk related to ingestion Cr-contaminated soils, and selecting appropriate remedial alternatives that are protective ground-water quality. In this study, good agreement was found between Cr(VI) soil concentrations the mass leached form columns over range Cr(III):Cr(VI) ratios (0.2--28) {Sigma}Cr (27--290 mg/kg). batch test, adsorption sandy rapid linear, with Kd{sub Cr(VI)} 0.2 liters/kg, suggesting Cr(VI)-contaminated vadose- saturated-zone materials may be remediated by flushing or pump-and-treat methods. column removed 85% soil-Cr(VI), while only 17% attributable aquifer contamination. Use oxidizing agent increased released from Cr(III)-contaminated but 1.3% 2.3% mass. Based on mobile, Cr(III) retained column, indicating reduction Cr(III), subsequent precipitation Cr{sub x}Fe{sub 1{minus}x}(OH){sub 3}, occurred augmented Fe{sup +2}, resulting
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