螯合剂GLDA对土壤Cr的淋洗修复研究
[Abstract]:The batch leaching of Cr contaminated soil was carried out by chelating agent GLDA. The effects of GLDA with different concentrations and pH values on the elution of Cr in soil were investigated, and the elution differences between GLDA and (EDTA) were compared between GLDA and ethylenediamine tetraacetic acid (ETAA). The elution time, the ratio of soil to water and the times of leaching of Cr in soil were optimized by screening and optimizing the leaching time of Cr in soil by GLDA. The results showed that the removal of Cr from soil by GLDA at low concentration was significantly better than that by EDTA,. The elution rate reached the highest when the concentration of GLDA was 0.70, and was 67.59. There was no significant difference in elution effect between GLDA and EDTA under acidic and alkaline conditions. The optimum elution conditions were as follows: elution time 24 h, water / soil ratio 25: 1, leaching times 2 times. The speciation analysis of Cr in soil showed that GLDA could effectively remove weak acid extracted form and Cr, partial removal of oxidable Cr, in soil, which could effectively reduce the toxicity and bioavailability of Cr in soil.
【作者单位】: 广西大学环境学院;广西大学化学化工学院;
【基金】:广西自然科学基金项目(2010GXNSFA013004)
【分类号】:X53
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