有机酸对土壤重金属的浸提效果研究

Effect of Organic Acids on the Extraction of Heavy Metals

重金属污染土壤的原位淋洗修复既要实现对重金属的高效去除,还要尽量减少对土壤性质的破坏。以张士污灌区农田土壤为研究对象,利用振荡浸提技术对有机酸淋洗重金属污染土壤进行研究。结果发现:对重金属Cd、Pb、Zn的浸提率随着酒石酸、乙酸、柠檬酸、苹果酸的浓度升高而增加;4种有机酸对土壤重金属的浸提效果均是Cd>Pb>Zn;酒石酸在浓度为0.5mol/L时对土壤中重金属Cd、Pb、Zn的浸提效果最好,浸提率分别为99.39%、57.65%、43.52%。

It＇s necessary to remove the heavy metals efficiently and minimize the destruction on the soil properties with in-situ remediation of HMs contaminated soils by leaching,and which is particularly important in remediation of the contaminated agricultural soil.This study takes Zhangshi sewage irrigation region as the research object,using oscillating extraction for organic acids remediation of the HMs contaminated soil by leaching.The results showed that the extractive of Cd,Pb,Zn increased with the increasing concentration of tartaric acid,acetic acid,citric acid and malic acid;the extracting of the heavy metals were CdPbZn;tartaric acid in 0.5 mol/L extract beat,99.39% Cd,57.65% Pb,43.52% Zn respectively.