贵州省清镇市、德江县耕作土壤重金属污染评价分析

通过对贵州省清镇市、德江县耕作土壤重金属Pb、Cd、Hg含量进行测定分析,初步评价土壤重金属污染现状,结果表明:各样点土壤不同层次之间的重金属含量变化差异不大,但不同样点之间的重金属含量差异较大;共和点的重金属污染处于警戒状态,而辣子树、新店、泉口均受到不同程度的重金属污染。两县市耕地土壤重金属处于轻度污染状态,Cd和Hg是这两个区域耕地土壤的主要污染元素,因此,这两个区域还不适合发展无公害农产品。今后,应该重视加强污染区域的治理,消除重金属元素的污染隐患。

Pollution evaluation of heavy metal content in cultivated soil in Qingzhen and Dejiang of Guizhou Province

In the experiment,the contents of heavy metal Pb,Cd and Hg of farming land soil were determined and analyzed to evaluate the present situation of heavy metal pollution in Qingzhen City and Dejiang County of Guizhou Province.The results showed that the content of heavy metals in different soil profile layers in the sampling site was not varied greatly,but there was great difference of heavy metals in different sampling sites.For four sampling sites,the heavy metal pollution of Gonghe village was in alert status,and the other three sampling sites Lazishu,Xindian and Quankou as polluted by heavy metal at different levels.In general,the farming land soil in Qingzhen City and Dejiang County was polluted by heavy metal lightly,Cd and Hg were the main pollution elements in the soil.Therefore,the pollution-free agricultural products could not be developed in Qingzhen and Dejiang.In the future,the control of pollution region should be strengthened to eliminate the potential pollution resources of heavy metals.