不同稳定剂对土壤重金属稳定效应的影响研究

Effects of Different Stabilizers on the Stabilization of Heavy Metals in Soils

目前,我国重金属污染土壤的情况越来越严重,基于此情况,试验模拟重金属复合污染稻田土壤环境,向污染土壤中添加单一稳定剂(石灰石、高岭土、菌渣、磷酸二氢钾)及其组配稳定剂。试验结果如下:在单一稳定剂中,石灰石的稳定/固化效果最好;石灰石对Pb、Cd、Cu、Ni、Zn 5种重金属的稳定效率分别为96.48%、41.62%、98.41%、46.98%、50.04%。在组配实验中,2∶1的SG(石灰石+高岭土)的稳定效率最高,Pb、Cd、Cu、Ni、Zn 5种重金属在供试土壤中的浸出量分别降低95.63%、31.69%、97.07%、36.45%、36.78%。

At present, China′s heavy metal pollution of the soil situation is more and more serious, so the test simulation of heavy metal compound pollution of paddy soil environment, to the contaminated soil to add single stabilizers(limestone, kaolin, mushroom residue, potassium dihydrogen phosphate) and their combination stabilizers were added to the polluted soil. The results are as follows: The stability of limestone were the best among all single stabilizers. The stability of limestone on Pb, Cd, Cu, Ni and Zn was 96.48%, 41.62%, 98.41%, 46.98% and 50.04%. The stability of SG(limestone+kaolin) 2∶1 was the highest in the experiment. The leaching rates of 5 heavy metals in Pb, Cd, Cu, Ni and Zn were reduced by 95.63%, 31.69%, 97.07%, 36.45%, 36.78%, respectively.