乙二胺四乙酸(EDTA)和乙二胺二琥珀酸(EDDS)对污染土壤中Cd、Pb的浸提效果及其风险评估  

LEACHING OF Cd AND Pb FROM A CONTAMINATED SOIL WITH EDTA AND EDDS:EFFECTIVENESS AND HEALTH RISK ASSESSMENT

作　　者：赵娜[1,2] 崔岩山[2] 付彧[2] 谢建治[1] 

机构地区：[1]河北农业大学资源与环境科学学院,保定071000 [2]中国科学院研究生院,北京100049

出　　处：《环境化学》2011年第5期958-963,共6页Environmental Chemistry

基　　金：国家高技术研究发展计划(863)项目(2008AA06Z336)资助

摘　　要：为了研究EDTA和EDDS对污染土壤中Cd、Pb的去除效果和去除后土壤中Cd、Pb的风险,利用不同浓度的EDTA和EDDS(0、5、10、20、30、50 mmol.L-1)对污染土壤中Cd、Pb进行浸提,并利用in vitro方法(人工模拟胃肠系统)对浸提后的土壤进行风险评估.结果表明,EDTA对Cd的去除率显著高于EDDS,EDTA对Cd的去除率最高为82.4%;EDDS对Cd的去除率最高为46.8%.在5—30 mmol·L-1范围内,同浓度下,EDDS对Pb去除显著高于EDTA,两种螯合剂在50 mmol·L-1时对Pb的去除无显著差异.in vitro实验表明污染土壤浸提后Cd、Pb的生物可给性显著降低.经EDDS浸提后Cd的生物可给性低于EDTA浸提后,Pb的生物可给性高于EDTA浸提后的结果.Effectiveness and health risk assessment of Cd and Pb in soil was studied in a contaminated soil after remediation with EDTA and EDDS.In vitro method（artificial gastrointestinal system） was used to evaluate the health risk.The results showed that Cd and Pb removal increased significantly with increasing concentration of EDTA and EDDS.Cd removal by EDTA was significantly higher than that of EDDS.The highest Cd removal rate was 82.4% with EDTA and 46.8% with EDDS.Pb removal by EDTA was significantly higher than that of EDDS in the 5—30 mmol · L-1 treatments.However,no difference in Pb removal was observed between two chelating agents in 50 mmol · L-1.In vitro experiments showed that the concentrations of dissolved Cd and Pb in the gastric and small intestinal phase were reduced after leaching with the chelating agents.The bioaccessiblity of Cd after EDDS leaching was lower than EDTA.However,the bioaccessiblity of Pb after EDDS leaching was higher than that of EDTA leaching.The results will provide some information about remediation of heavy metal contaminated soils with EDTA and EDDS and their health risk assessment.

关 键 词：EDTA EDDS 重金属 去除率 生物可给性 

分 类 号：X53[环境科学与工程—环境工程]