期刊论文

中文

中国环境科学

1000-6923

2003

23

6

597-601

10.3321/j.issn:1000-6923.2003.06.009

教育部科学技术重点项目（教技司[2000]156-00209）

本校为第一机构

研究了EDTA萃取液中重金属的分离技术并将其应用于修复上壤污染．结果表明，EDIA溶液能有效地萃取上壤中重金属；Na-2S能沉淀分离ED丁A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EDIA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％．上壤中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．

The technique of separating heavy metals in ethylenediamine-tetraacetic acid (EDTA) solution was studied and used for remediation of soils pollution. EDTA solution could extract effectively the heavy metals in soil. Na2S could separate sedimentarily Cd, Cu, Pb in EDTA solution with efficiency over 99%; but Zn precipitation required the addition of Ca(OH)2. Ca2+ introduced into the reaction system had no influence on extraction of heavy metals and EDTA recovery. Successive extractions process enhanced the removal rate of heavy metals in contaminated soils. The removal rates of Cd and Pb accumul...