EDTA溶液萃取污染土壤中的重金属及其回收技术

被引:36
作者
曾清如
廖柏寒
杨仁斌
William H.Hendershot
机构
[1] 湖南农业大学资源环境学院
[2] Department of Natural Resource Sciences
[3] McGill University 湖南长沙
[4] 湖南长沙
[5] Canada HX
关键词
金属分离; EDTA萃取; 回收; 土壤修复;
D O I
暂无
中图分类号
X53 [土壤污染及其防治];
学科分类号
082803 ; 120405 ;
摘要
研究了EDTA萃取液中重金属的分离技术并将其应用于修复土壤污染.结果表明,EDTA溶液能有效地萃取土壤中重金属; Na2S能沉淀分离EDTA溶液中的Cd, Cu, Pb,效率达99%以上,但沉淀Zn需要加入Ca(OH)2,引入反应体系的Ca2+并不影响重金属的萃取和EDTA的回收;连续抽提能增加污染土壤中重金属的去除率,回收的EDTA连续使用10次,损失约30%.土壤中Cd和Pb的累积去除率分别达75.6%,72.5%.得到的硫化物沉淀含有很高的重金属,能很方便地处理或回收.
引用
收藏
页码:38 / 42
页数:5
相关论文
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湖南农学院学报, 1995, (02) :111-115
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