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矿区附近农田土壤中重金属和矿质元素浸提研究

Keywords: 重金属,矿质元素,螯合剂,浸提

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Abstract:

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Zn3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)。

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