中文摘要：

采用3种生物可降解螯合剂[S，S-乙二胺二琥珀酸（EDDS）、氨三乙酸（NTA）和柠檬酸（CIT）]和2种生物难降解螯合剂[乙二胺四乙酸（EDTA）和二亚乙基三胺五乙酸（DTPA）]对南京市栖霞山铅锌矿和汤山铜矿区附近农田土壤中重金属和矿质元素进行了浸提研究，比较不同螯合剂对重金属Cu、Pb和Zn的浸提率及对矿质元素的溶出效应。结果表明，EDDS、EDTA、DTPA对各土壤样品中Cu、Pb和Zn 3种重金属提取率高于NTA，CIT的提取率最低。EDDS对Cu和Zn的提取率与EDTA、DTPA相当，但其对Pb的提取率明显低于EDTA和DTPA。对矿质元素的浸提结果表明，螯合剂的存在明显增加Mn和Fe的提取率；Al、Si的提取率也有所增加。对于实验中的4种土壤样品EDDS对Mn的溶出率低于EDTA和DTPA；但EDDS对Fe溶出作用高于其他螯合剂。NTA对Fe、Mn的溶出作用低于EDDS、EDTA和DTPA。Ca、Al、Mg和Si的各螯合剂提取率之间没有显著性的差异（P〉0．05）。

英文摘要：

Heavy metals （Cu, Pb and Zn） and mineral elements （Fe, Mn, Ca, Al, Mg and Si） in four agricultural soil samples collected from the lead-zinc mine area of Qixiashan and copper mine area of Tangshan in Nanjing were extracted by biodegradable chelators [S, S-ethylene diamine disuccinate （EDDS）, nitrilotriacetate （NTA） and citriate （CIT）] and non-biodegradable chelators [ethylene diamine tetraacetate （EDTA） and diethylenetriaminepentaacetate （DTPA）], respectively. The results showed that contents of some heavy metals in these soils were above the threshold values announced by national environmental quality standard for soils, The presence of the chelators enhanced the solubility of Cu, Pb and Zn evidently. Among the five chelators, the extraction efficiency for heavy metals by EDDS, EDTA and DTPA were higher than NTA, and CIT had the lowest extraction efficiency. Extraction efficiency by EDDS were 0.42%N41.7% and 0.68%-24.8% for Cu and Zn, respectively, similar to that of EDTA （0.36%-38.6% for Cu and 0.54%-23.7% for Zn） and DTPA （0.75%-42.6% for Cu and 0.71%-26.4% for Zn）. But the extraction efficiency for Pb by EDDS （1.90%-16.6%） was obviously lower than that by EDTA （1.75%-34.4%） and DTPA （2.42%-25.9%）. Therefore, EDDS was more effective for the remediation of soil contaminated by Cu and Zn than other chelators. The extraction rates of Mn and Fe increased evidently at the presence of the five chelators, and the solution of Al and Si were also slightly enhanced. Extraction efficiency for Mn from four soil samples by EDDS was lower than that by EDTA and DTPA. But the extraction efficiency for Fe by EDDS was higher than other chelators. So the dissolution of Mn and Fe should be considered in the utilizing of chelators for the remediation of heavy metal-contaminated soil. The extraction efficiency for Fe and Mn by NTA was lower than EDDS, EDTA and DTPA. Combining with its medium extraction efficiency for Cu, Pb and Zn, NTA had prospect on the remediation of heavy metal-co