期刊论文

中文

农业环境科学学报

1672-2043

2005

24

6

1233-1237

10.3321/j.issn:1672-2043.2005.06.039

科技部中法先进研究计划（PRAE00-04）； 教育部科学技术研究重点项目（教技司[2000]156-00209）； 湖南省教育厅重点科研项目（00A003）；

本校为第一机构

用Tessier连续提取法研究了EDTA萃取前后受污染覆盖土和灌溉土土壤中重金属Pb、Cd、Zn的形态变化。结果表明。2种污染土壤中的重金属Pb、Cd、Zn的形态分布各有差异，均以残渣态为主。在5．0mmol·L^-1浓度条件下，EDTA对Pb和Cd的萃取能力较其对Zn的萃取能力强；经EDTA萃取后的土壤中Pb、Cd、Zn残渣态、碳酸盐结合态、铁锰氧化物结合态、交换态含量分别有所下降，Pb和Cd减少顺序为残渣态〉碳酸盐结合态〉铁锰氧化物结合态〉交换态，Zn减少顺序为残渣态〉交换态〉铁锰氧化物结合态〉碳酸盐结合态；而有机物结合态Pb、Cd、Zn的含量却有所增加，其增加幅度为Zn〉Pb〉Cd。

In order to evaluate chemical behaviors and bioavailability of heavy metals in contaminated soils, two types of topsoil samples were collected at a Pb-Zn mining area located in Chenzhou city, southern Hunan Province （southern China）, where mining activities of heavy metals have been conducted for about 500 years and ore waste tailings have been piled up around. In recent decades, high contents of heavy metals such as Pb, Cd, Zn, Cu, Cr, and As have been found in environment nearby due to the collapse of a tailing dam in 1985, especially in th...