冀东表层土壤中重金属富集特征与污染评价

Enrichment Characteristics and Pollution Assessment of Heavy Metals in Topsoil of Eastern Hebei

利用冀东多目标地球化学调查资料,研究了冀东表层土壤中重金属元素As、Cd、Cr、Hg、Pb的富集特征与污染程度,结果表明:与我国土壤元素的背景值相比,冀东表层土壤中Cd富集程度较大;与研究区背景值相比,表层土壤中Pb、Cd、Hg富集程度较大,其中Hg平均含量为背景值的2.91倍,按富集程度排序为Hg>Cd>Pb>As>Cr。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,As、Cd、Cr、Pb未造成污染。

Multi-objective geochemical materials of eastern Hubei were used to study the enrichment characteristics and pollution assessment of heavy metals （As, Cd, Cr, Hg and Pb） in topsoil of eastern Hubei. Result showed that, compared with the background value in soil elements in China, the enrichment degree of Cd in topsoil was greater. Compared with the background value in research region, the enrichment degrees of Pb, Cd and Hg in topsoil were greater. Among them, Hg average content was 2.91 times of the background value. The rank of enrichment degree was Hg 〉 Cd 〉 Pb 〉 As 〉 Cr. Pollution assessment result of geo-accumulation index showed that the heavy metals caused no pollution, calculating by national soil background value. While based on background value in research region, Hg showed light-middle pollution status, and As, Cd, Cr and Pb caused no pollution.