Abstract:For assessing leaching remediation efficiency of different biodegradable chelating agents for remediating heavy metals-contaminated soils, Citric acid (CA), DL-2-(2-carboxymethyl) nitrilotriacetic acid (GLDA)(biodegradable chelating agents) and Ethylenediaminetetraacetic acid (EDTA) (a conventional leaching agent as a check) with different leaching treatments were applied to evaluate the removing efficiency of Cd and Ni from yellow brown soil and red soil that have been highly contaminated with various heavy metals in two mining areas. Our experimental results demonstrate higher efficiencies of both EDTA and GLDA for removing Cd and Ni from these soils comparing with CA to reduce the mobility and bioavailability of soil heavy metals. However, the adverse effects of GLDA and CA leaching remediation on soil enzyme activity are significantly lower than that of EDTA leaching remediation. In view of both leaching efficiency and ecological safety, our study has confirmed that GLDA can be used as a good substitute for the conventional leaching agent EDTA in the acidic soils contaminated with heavy metals.
高一丹, 袁旭音, 汪宜敏, 熊钰婷, 章海燕. 不同螯合剂对两类Cd和Ni污染土壤的淋洗修复对比[J]. 中国环境科学, 2022, 42(1): 250-257.
GAO Yi-dan, YUAN Xu-yin, WANG Yi-min, XIONG Yu-ting, ZHANG Hai-yan. Leaching remediation efficiency of biodegradable chelating agents for the Cd and Ni contaminated soils. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 250-257.
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