广西百色不同功能区土壤重金属污染与来源

以百色城区及周边县城土壤为研究对象,测定不同功能区(清洁区、矿区、工业区和城市中心区)土壤Co、Cr、Cu、Ni、Pb、Zn、Cd、As和Hg含量,采用地质累积指数法评价重金属污染水平。结果表明,百色地区土壤重金属含量差异很大,除Cu以外,工矿区土壤重金属污染达到中度污染水平以上,其中Cd达到强污染水平;清洁区和城市中心区土壤大部分重金属元素则处于无污染水平。采用主因子分析法分析了矿区和工业区土壤重金属可能的污染源,结果显示工矿区土壤重金属可能有三个来源:工业源的Co、Ni、Pb、As、Hg,混合源的Cd、Cr、As、Zn,自然源的Cu、Zn。

Contamination and Source Identification of Soil Heavy Metals in Different Functional Zones at Baise.Guangxi

Heavy metal concentrations of Co,Cr,Cu,Ni,Pb,Zn,Cd,As and Hg were determined for 43 soil samples collected from four different functional zones(clean,mining,industrial and anthropic zones) at Baise,Guangxi.Geo-accumulation index method was applied to assessing heavy metal contamination.Results showed great variations in heavy metal concentration in soil under different functional zones.Pollution in the mining and industrial zones is at middle level or above except Cu,and Cd which reach a high level of pollution.While pollution in the clean and anthropic zones is at clean level.The identification of possible source in the mining and industrial zones was carried out by means of principal component analysis by applying a Varimax Rotated Componet Matrx,which showed that heavy metal contamination was likely to come from three sources.Co,Ni,Pb,As and Hg are likely to have been derived from industrial activities.Cd,Cr,As and Zn are likely to have been derived from a mixed source.Cu and Zn are likely to have come from local soil.