再生铅企业土壤-地下水中重金属污染迁移特征

为了解某再生铅企业厂区土壤和浅层地下水重金属污染状况,采集了96个土壤样品和4个地下水样品,定量分析了其Pb,Cd,As的含量及空间分布特征,探讨企业生产对环境造成的影响。结果表明,该区域土壤中Cd、As、Pb超标率分别为67.0%,35.1%,11.7%,在厂区呈现局部富集现象,最大值是土壤背景值的几十倍乃至数千倍;在垂直方向上由于Pb,Cd,As在土壤中迁移率较低,其值随深度增加呈总体下降趋势;该区域地下水中Pb,Cd,As值远低于地下水质量标准值。

Migration Characteristics of Heavy Metals Pollution in Soil and Groundwater of Regenerate Lead Industry

In order to understand the heavy metal pollution of soil and shallow groundwater by regenerate lead industry , we collected 96 soil and 4 groundwater samples from one regenerate lead corporation .The concentration and spatial distribution of Pb , Cd and As were quantitatively analyzed .The results showed that over-standard rates of Cd , As and Pb in soil were 67.0%, 35.1% and 11.7%, respectively, showing localized enrichment around the corporation with the maximal content tens , or even thousands times higher than that of background soil .The content of Pb , Cd and As decreased with increased depth of soil due to low vertical mobility of these metals in soil .The content of Pb , Cd and As in groundwater was far below the quality standard value for groundwater .