【摘要】 对北京市密云水库上游某流域周边土壤重金属(As、Hg、Zn、Cu、Cd、Pb、Ni、Cr)的空间分布、来源及污染现状进行评价。地累积指数法、单因子指数与内梅罗综合污染指数法、多元统计分析(相关性分析、主成分分析)表明,Cu、Pb、Zn、Cd和As五种元素主要来源于矿山开采、选矿以及运输等过程;Cr和Ni污染主要来源于旧金属垃圾及铁矿开采伴生元素;Hg元素污染主要来自于金矿的采选过程。Cr元素在该流域内污染比例较大,Hg与Cd两种元素变异程度较大,污染较为严重的区域主要集中在金矿和尾矿库附近。Pb和As两种元素污染程度处于相对安全水平。更多还原

【Abstract】 The spatial distribution, source and pollution status of heavy metals(As, Hg, Zn, Cu, Cd, Pb, Ni, Cr) around a River Basin in the upper reaches of the Miyun Reservoir in Beijing are evaluated. Single factor index, Nemero comprehensive pollution index method and multivariate statistical analysis(correlation analysis, principal component analysis) show that Cu, Pb, Zn,Cd and As are mainly derived from mining, beneficiation, transportation and other processes; Cr and Ni pollution mainly from old metal garbage and iron mining process; Hg element pollution mainly from the gold mining process. The content of Cr in the basin is relatively high, and the two elements of Hg and Cd are highly variable. The areas with serious pollution are mainly concentrated in the vicinity of gold deposits and tailings ponds. The degree of contamination of both Pb and As is relatively low.更多还原