清徐县农田土壤重金属含量及来源分析

Source and Content of Heavy Metal in Agriculture Soil of Qingxu in Shanxi Province

为调查清徐县农田土壤重金属污染现状和来源,测定清徐县20个土壤样品Cd、Hg、Pb、Cr、As、Cu、Zn7种元素含量,并采用累积性指数、地累积指数及主成分分析法分析。结果表明,20个样点土壤重金属整体处于无污染水平,但与山西省土壤背景值相比,Hg、Pb为轻度-中度累积。土壤中Hg、Pb主要来源于交通运输和工业气体排放,其余元素主要为自然来源。

In order to investigate the status quo and source of heavy metal pollutants in agriculture soil of Qingxu County, this paper tested the content of seven elements including Cd,Hg,Pb,Cr,As,Cu and Zn of 20 soil samples by ways of cumulative index, index of geo-accumulation and PCA （principal component analysis）. The results indicated that the heavy metals of in 20 sites is at a level of non-contamination in whole, but Hg,Pb are at the level of mild-moderate accumulation compared to the background level of soil content in Shanxi Province. Hg and Pb in soil are mainly from communication and transportation as well as industrial gas emission while others from natural source.