冀东平原土壤中重金属元素的地球化学特征

通过分析冀东平原土壤中有害重金属元素Pb、Cr、Cd、As、Hg的含量变化特征,显示有害重金属元素Hg、Cd、Pb在冀东平原表层土壤的富集已较为明显,Cr、As也形成局部的异常,原有的地球化学特征发生较大变化。初步认为表层土壤中重金属元素的高含量与当地地质背景和人为活动有关,局部异常成因需要进一步研究。研究区地积累指数污染评价结果表明:以全国土壤背景值计算,重金属未造成污染;以研究区背景值计算,Hg表现为轻度—中度污染状况,As、Cd、Cr、Pb未造成污染。

Geochemical Characteristics of Heavy Metal Elements in Soils of Eastern Hebei Plain

By analyzing the contents of harmful heavy metal elements of Pb,Cr,Cd,As,Hg in soils of Eastern Hebei plain,we found that the enrichments of harmful heavy metal elements of Hg,Cd,Pb in top-soils of Eastern Hebei plain is quite obvious,the local anomaly of Cr,As has been shaped,and the original geochemical features of soils have changed greatly.The high contents of heavy metal elements in top-soils are related to the local geological backgrounds and human activities,and the causes of local anomaly need further research.The index of geoaccumulation in the study area indicates that the heavy metal has not caused pollution based on the arithmetic means of natural soils of China;but based on the arithmetic means of the study area,Hg in the top soils causes slightly or moderate pollution and As,Cd,Cr,Pb do not cause any pollution.