新型改性蒙脱石材料对污染土壤中Cu的钝化修复效果

Passivation Effect of Modified Montmorillonite Material on Cu-Contaminated Soils

[目的]研究新型改性蒙脱石材料(巯基土)对土壤中Cu的钝化修复效果。[方法]以巯基土作为钝化剂,通过小白菜盆栽修复试验和田间修复示范试验,研究巯基土对Cu污染土壤的钝化修复效果。[结果]对于盆栽试验,添加适当比例的巯基土可显著降低小白菜植株Cu累积量,当添加量为1.0%时,Cu污染土上小白菜植株Cu累积量相比CK可降低44%;对于田间示范修复试验,添加0.2%和0.5%的巯基土相比CK可分别降低小白菜植株Cu累积系数达22.5%和17.0%,其钝化效果明显优于未经改性的钠化蒙脱石材料(钠化土)。[结论]该研究可为土壤Cu污染治理修复提供科学依据。

[ Objective] To study the passivation effect of modified montmorillonite material（ sulfhydryl soil） on Cu-contaminated soils. [ Method l Sulfhydryl soil was used as a passivation agent, and the immobilization effect of it on reducing Cu uptake by Brassica campestris L. was researched by pot experiment and field experiment. [ Result] The results showed that the addition of an appropriate propoltion of sulflwdryl soil could signifi- cantly reduce the accumulation of Cu by Brassica campestris L. for pot experiments,and the accumulation of Cu could decrease by 44% compared with the control when the addition reached to l% in polluted soils. For the field experiment,the addition of 0.2% and 0.5% sulfhydryl soil could reduce the Cu accumulation coefficient of Brassica campestris L. by 22.5% and 17.0% respectively compare with the control, and the passivation effect was much better than that of unmodified Na-montmorillonite. [ Conelusion]The study can provide scientific basis for remediation and reme- diation of soil Cu pollution.