Experimental Study on Stabilization of Chromium Contaminated Soil

摘要

To developed a practicable stabilization method for remediation chromium contaminated soil, reductant and chelate reagent were investigated for stabilization artificical chromium contaminated soil, and the stabilization effect was tested through extraction toxicity assay after stablized soil was oxidized at pH 12. The experimental results showed that the composition of sodium bisulfite & ammonium pyrrolidine dithiocarbamate was an ideal stabilizer of chromium in soil, and the extraction toxicity was much less than that of classical stabilized chromium polluted soil with only reductant or the maximum critical value in GB16889-2008, which suggested that the composition of reductant & compound of dithiocarbamate might be practically appllied for remediation chromium contaminated soil because it was likely to remain chromium much more stable in soil for a long time and significantly decrease Cr mobility.