两种低分子量有机酸及EDTA修复土壤中重金属Pb的研究

Extraction Condition for Heavy Metals Pb from Contaminated Soil by Using Low Molecular Organic Acids and EDTA

采用模拟试验,研究了EDTA和两种低分子量有机酸（柠檬酸、酒石酸）对污染土壤中Pb的浸提效果。结果表明：（1）EDTA及两种低分子量有机酸对污染土壤中Pb的活化能力依次为EDTA〉柠檬酸〉酒石酸。（2）EDTA及两种低分子量有机酸对Pb的总体活化趋势随浓度的增大而增大,EDTA及酒石酸在30 mmol/L左右的时候趋于平稳,达到最佳,柠檬酸的最佳浓度出现在20~30 mmol/L之间。（3）加入电解质对EDTA、及两种低分子量有机酸对土壤中Pb的浸提效果影响有差异。

The digestion effect of Pb in contaminated soil was studied by using EDTA and two kinds of low molecular organic acids（ citric acid,tartaric acid） through laboratory simulation test. The experimental results showed that Pb ability of activation in the contaminated soil by using EDTA and two kinds of low molecular weight organic acids was EDTA citric acid tartaric acid. EDTA and two kinds of low molecular weight organic acids to the trend of overall activation of Pb increased with the increasing of concentration,EDTA and tartaric acid tended to balance to achieve the optimum in about 30 mmol / L,the best concentrations of citric acid appeared in 20 ~ 30 mmol / L. It had different influence to the digestion effect of Pb in contaminated soil in join electrolyte of EDTA and two kinds of low molecular weight organic acid.