非生物螯合剂EDTA与生物螯合剂EDDS联合施用提高植物提取土壤重金属效应的研究

Effects of EDTA、EDDS Phytoextract Artificially Polluted Soil with Heavy Metals

为了在获得最小环境风险的同时最大程度地提高生物螯合剂和非生物螯合剂诱导植物对土壤重金属的活化效果以及植物生物累积诱导效率,通过对模拟受Pb、Cu、Cd复合污染土壤进行双子叶植物油菜、单子叶植物玉米的盆栽试验,探索非生物螯合剂EDTA与生物螯合剂EDDS联合施用提高植物修复土壤重金属效应的可行性。结果表明:螯合剂EDTA-EDDS联合施用对单子叶植物玉米和双子叶植物油菜的提取效应有很强的促进作用,高于EDTA和EDDS单独施用效果;在添加螯合剂EDTA/EDDS配比为2时,土壤有效态金属Pb、Cu的提取效应达到最高,分别为386.5和1 369 mg.kg-1;在添加螯合剂EDTA/EDDS配比为3时,土壤有效态金属Cd提取效应达到最高,为89.6 mg.kg-1;植物地下部分和地上部分Pb、Cu、Cd生物累积量在添加螯合剂EDTA/EDDS配比为3时最高。

In order to to minimum environmental risks while maximizing the mixture induced activa-tion effect of heavy metals, the cumulative effect of chelation of heavy metals in plant biotechnology in-duction efficiency, dicotyledonousoilseed rape （Brassica junica） , monocots maize （Zea mays L） pot experiment was conducted to explore the feasibility of joint best ratio of non-biological chelating agent EDTA and biological chelating agent EDDS application of phytoremcdiation of soil heavy metals , ba-sing on a simulation by Pb, Cu, Cd complex contaminated soil. The results show that, The chelator EDTA-EDDS joint application of plant extracts effect on corn monocots and dicots rapeseed strong role in promoting. Soil available metals Pb, Cu, adding a chelating agent EDTA/ratio of EDDS 2, the highest of 3 86.5 mg · kg^-1, 1 369 mg · kg^-1, respectively. Soil available Cd metal plus chelating agent EDTA/EDDS ratio, the highest 89.6 mg · kg^-1. Plant underground part and shoot Pb, Cu, Cd bioaccumulation amount of added chelating agent EDTA/highest ratio of EDDS.