EDTA与柠檬酸释放土壤中Cd、Pb的影响研究

Research on EDTA and Citric Acid Release Metal in Soil

通过模拟试验,比较研究EDTA、柠檬酸和EDTA与柠檬酸联合作用对污染土壤中重金属Cd、Pb的释放影响。结果表明:随着柠檬酸浓度的提高,土壤中Cd、Pb的释放量增加,最大释放率分别为0.9%、8.1%;随着EDTA浓度的提高,土壤中Cd、Pb的释放呈现先增大后减小的变化趋势,最大释放率分别为1.3%、24.2%;两种萃取剂联合作用提高了土壤中Cd的释放率,能有效地释放土壤中的Cd、Pb,最大释放率分别为1.85%、17.3%。

The simulation experiment was carried out to study the release of Cd,Pb by adding ethylene diamine tetraacetic acid（EDTA） and citric acid into the soil.The results showed that the release of Cd,Pb increases with the rising of citric acid concentration at the highest releasing rate of 0.9% and 8.1%,respectively.The releasing amount of Cd and Pb increased at first but then decreased with the increase of EDTA concentration.The highest releasing rate of Cd and Pb were 1.3% and 24.2%.The associative action of EDTA and citric acid can promote Cd releasing from soil,and can release Cd and Pb in soil effectively.The maximum releasing rate of Cd and Pb were 1.85% and 17.3%,respectively.