【摘要】 文中按土壤利用方式将金川区分为矿业活动区、农耕区、城市活动区和未开发区,调查了金川区表层土壤中As、Hg、Cr、Ni、Cu、Zn、Cd和Pb含量及分布特征,采用相关性分析和聚类分析确定土壤重金属来源,并利用地累积指数评价了重金属污染情况。结果表明金川区土壤Hg、Cr、Ni、Cu、Cd和Pb高于甘肃省土壤背景值,Ni含量超过了国家二级标准。各分区内Ni和Cu均高于甘肃省土壤背景值。土壤中重金属主要来源于矿业活动产生的废水废气,其次为城市交通、燃煤和污水灌溉。地累积指数表明金川区Cu和Ni污染最为严重,各分区污染程度表现为:矿业活动区>农耕区>城市活动区>未开发区。更多还原

【Abstract】 Jinchuan district was taken as research subjects. Where can be divided into four areas according to different usages, i.e. mining industry zone, agricultural land, urban living area and undeveloped area. The contents of As, Hg, Cr, Ni、Cu, Zn, Cd and Pb in surface soil were measured and the pollution levels in different function areas were evaluated by geo-accumulation index. Correlation analysis and cluster analysis were used to deduce the source of the heavy source in soil. The result showed the average level of all heavy metals in Jinchuan exceeded the background values of Gansu province and the content of Ni was above the national soil quality secondary standard. The content of Cu and Ni were exceeded the background values. The sources of heavy metals mainly came from the waste water, gas and solid produced by mining activity and smelt, secondly came from the urban traffic, fossil fuels, and sewage irrigation. Geo-accumulation index showed Ni and Cu in Jinchuan reached moderate pollution, and others were clear. The degree of heavy metal pollution of different functional areas follow a pattern of mining industry area> agricultural area>urban living area>undeveloped area.更多还原