金矿区尾矿渣周边土壤的重金属污染评价研究

在小秦岭金矿区内选取姚青村、来福沟和毛沟三个具有代表性研究区,采集研究区内尾渣堆及渣堆周围农田样品30个,测定了重金属Cr、Ni、Cu、Cd、Zn、As、Pb含量。对土壤样品重金属测定结果分别采用地累积污染指数法和潜在生态危害指数评价法进行评价,结果显示:As不是矿业活动污染的典型金属;姚青村和来福沟重金属典型污染物为Cu、Zn、Cd、Pb。采用地累积污染指数法评价,姚青村和来福沟的Pb属于极严重污染,而Cr、Ni均属无污染。采用潜在生态危害指数法进行评价,毛沟研究区属轻微生态危害,姚青村和来福沟生态风险程度均属极强,贡献率大的元素主要为Pb和Cd。

Assessment of the Heavy Metal Pollution in the Typical Agricultural Soil around the Tail Slag

Yao Qing, Lai Fu Gou and Mao Gou were selected as the representative study area in the Qinling Mountains area. 30 field samples were collected from the tailings and the typical agricultural soil in the study area, and the content of Cr, Ni, Cu, Cd, Zn, As, Pb were measured. The soil samples were used to the determination of heavy metals pollution accumulation index and potential ecological risk index evaluation method. The results showed that As was not a typical metal mining pollution, and the typical pollutants and heavy metals for Yao Qing, Lai Fu Gou are Cu, Zn, Pb. According to the index of geoaccumulation, the pollution level of the Qing Yao and Lai Fu Gou ranged from medium to extremely serious pollution, Cu and Zn belong to the middle to moderate, meanwhile Cr and Ni were non pollution. The pollution degree was evaluated by the potential ecological risk index method, the Maogou study area was slight ecological harm, while the ecological risk degree of the Yao Qing and the Lai Fu Gou was very strong, Pb was the greatest element in all of the heavy metals.