五台山北麓土壤重金属含量的空间分布与污染评价

SPATIAL DISTRIBUTION AND POLLUTION EVALUATION OF HEAVY METALS IN SOIL OF THE NORTHERN FOOT OF WUTAI MOUNTAIN

为全面了解五台山北麓土壤重金属污染现状,在北麓3条河流域内布设24个采样点,测定土壤中Cr、Cd、Pb、As、Hg的含量及空间分布关系。结果表明:1)5种重金属含量均呈现富集状态,Hg和As达到污染状态;3条流域中,羊眼河富集最为明显;2)Cd、Pb、As空间分布相似,高值区位于羊眼河;Hg整体上污染较为严重;Cr的高值区位于东部;3)5种重金属的污染综合评价结果为"很强",其中Hg的单因子指数均值达19,污染比较突出;4)采用地积累指数法评价得出:该区域Hg、Cd、Pb是土壤污染的主要因子,羊眼河为中度-偏重污染,青羊河为轻微污染,峨河为清洁。

In order to explore the pollution level of heavy metals in soil of the northern foot of Wutai Mountain,24 soil samples were collected. The contents and spatial distribution of Cr,Cd,Pb,As,Hg in soil of the northern foot of Wutai Mountain were determined. The results showed that： 1） The contents of five heavy metals were enriched,Hg and As reached the level of pollution; Among the three basins,the enrichment of Yangyan River was obvious; 2） The spatial distribution characteristics of Cd,Pb and As were similar,the high value area was located in the Yangyan River; Hg was more seriously polluted in the whole research area; the high value area of Cr was located in the east; 3） The integrated pollution index method showed that the pollution levels of five heavy metal were serious. Especially the single factor index average value of Hg was 19,which was the most prominent; 4） According to the index of geo-accumulation,Hg,Pb,Cd were the main factor metals in soil. The Yangyan River was moderate-heavy pollution,the Qingyang River was light pollution,and the E River was clean.