EDTA与EDDS螯合诱导印度芥菜吸取修复重金属复合污染土壤研究  

Chelate-induced extraction and remediation of Brassica juncea on heavy metals mix-polluted soils by EDTA and EDDS

作　　者：宋静[1] 钟继承[1] 吴龙华[1] 王国庆[1] 李晨曦[1] 骆永明[1] 钱薇[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与环境生物修复研究中心

出　　处：《土壤》2006年第5期619-625,共7页Soils

基　　金：国家重点基础研究发展规划项目(2002CB410809/10);国家自然科学基金项目(40301046;40432005);中国科学院知识创新项目(KZCX3-SW-429;CXTD-Z2005-4)共同资助。

摘　　要：盆栽试验比较研究了EDTA和易降解的EDDS对复合污染土壤中Cu、Zn、Pb、Cd的活化能力及印度芥菜对4种重金属的吸收与转运特征。结果表明:施用量相同的条件下,EDDS活化土壤Cu的能力与EDTA相当;而EDDS活化土壤Zn、Pb、Cd,尤其是活化土壤Pb、Cd的能力小于EDTA,这与两种螯合剂与不同重金属形成螯合物的稳定常数相一致。向复合污染土壤中施入3mmol/kg和6mmol/kgEDDS均可诱导印度芥菜叶中超量积累Cu。本研究中3mmol/kgEDDS的不同施用方式(单次施,分2次和4次施)对印度芥菜叶片Cu含量的影响差异不显著。各处理印度芥菜叶中的重金属浓度要远高于茎中的浓度,茎中的Cu浓度随土壤溶液Cu浓度线性增加,而叶中Cu的浓度随土壤溶液Cu浓度先增加后下降。A pot experiment was carded out to investigate the effects of application of EDTA and EDDS on solubilization of soil metals （Cu, Zn, Pb and Cd） and uptake by Brassicajuncea. The results showed that with the same application rate （3 mmol/kg）, EDDS was equally effective in solubilizing soil Cu as EDTA. Whereas, EDDS was less effective in solubilizing Zn, Pb and Cd. These conform to the stability constants of chelates. Hyperaccumulation of Cu in the leaves of B. juncea was achieved in all of application of 3 mmol/kg and 6 mmol/kg EDDS treatments. When EDDS was applied as 3 mmol/kg, there was no significant difference in Cu concentrations in the leaves among application modes （in single shot, in two or four splitting shots）. Cu concentrations were much higher in the leaves than in the stems. Cu concentration in the stems increased linearly with that in the soil solution. While, Cu concentration in the leaves showed a parabola relationship with that in the soil solution.

关 键 词：土壤重金属 螯合诱导 植物吸取 印度芥菜 

分 类 号：X131.3[环境科学与工程—环境科学]