【摘要】 为认识宿州煤矿区大气降尘中重金属的污染现状及来源,利用富集因子指标评价尘样中Cu、Pb、Zn、Cr、Cd、As、Mn和Fe的污染等级,并借助相关分析和主成分分析手段对降尘中重金属元素的来源进行了研究。结果表明:降尘中Cu、Pb、Zn、Cd和As的平均含量均高于安徽省土壤背景值,而Cr、Mn和Fe则低于土壤背景含量;Cd的元素富集因子为9.02,为显著污染水平,Cu和As的富集因子介于2~5,为中度污染,其余元素富集因子均小于2,为无污染至弱污染;降尘中的Cd和As元素具有同源性,与煤矿开采及煤炭资源利用等相关的人为活动密切相关,Cu、Pb和Zn的含量富集主要受到矿区大型运输车辆交通污染影响,而降尘中Cr、Mn和Fe则来源于地表土壤颗粒物。更多还原

【Abstract】 To recognize the pollution situation and sources of heavy metals in atmospheric deposition in Suzhou coal mine area,the contamination levels of eight elements(Cu,Pb,Zn,Cr,Cd,As,Mn and Fe) were assessed by the index of Enrichment Factor(EF),and then the sources of these elements were revealed based on the methods of correlation analysis and principal component analysis.The results showed that:the average concentrations of Cu,Pb,Zn,Cd and As were higher than the soil background of Anhui province,while Cr,Mn and Fe were reverse;Cd belonged to significant pollution level with the highest EF value of 9.02,Cu and As was intermediately polluted,and the other elements were between no pollution and weak pollution;Cd and As mainly came from the human activities related to coal exploitation and consumption,Cu,Pb and Zn were obviously influenced by transportation of larger vehicles,and Cr,Mn and Fe were from the surface soil particulates.更多还原