为了解矿山开采对当地土水环境的影响,测定了秀山龙洞沟汞矿附近土壤和水样中的总汞含量.结果表明矿区水样的总汞含量为0.0186～0.675mg/L,比全国水体平均值高2～3个数量级；土壤汞含量为1.40～19.72mg/kg,明显高于中国土壤背景值.随与汞矿的距离变远和水土的自净作用,土水样品中的汞含量逐渐变小.但是,矿山的长期开采和冶炼,加上长期的风化、水流和大气沉降作用,将矿区的大量汞迁移到周围的农田和河流,使得当地的土水环境受到汞的污染.%In order to understand the impact of mine exploitation on local water and soil environment, soil and water samples were collected from the vicinity of Longdonggou Mercury Mine in Xiushan, Chongqing, and total mercury in them was determined. Total Hg content in the water samples was shown to range from 0. 0186 to 0. 675 ng/L, being 2-3 orders of magnitude higher than the national average in waterbodies. Hg content in the soil samples ranged from 1. 40 to 19. 72 mg/kg, being higher than the background value of soil Hg in China. Owing to the self-purification of soil and water, the content of mercury in the environment decreased gradually with increasing distance from the mercury mine. However, as a result of long-term Hg exploitation and smelting and due to the actions of weathering, water flow and atmosphere deposition, a large quantity of mercury was transported to the farmland and rivers/streams close to the mine, thus resulting in a mercury pollution of local soil and water environment.
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