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贵阳市表层土壤中汞的环境地球化学基线及污染研究

Keywords: ,基线,污染,贵阳,土壤

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Abstract:

以土壤环境地球化学研究为主线,在贵州省贵阳市8046km2研究区域中,将土壤重金属元素汞的空间分布规律与环境地球化学机理研究相结合,建立区域土壤环境地球化学基线,选用合适的判别指标判识自然作用过程与人类活动过程对土壤环境的影响,对487个样品的汞含量进行了统计分析。结果表明,贵阳市表层土壤中重金属元素汞的基线值为0.045mg·kg-1,样品中汞元素含量大于0.530mg·kg-1的样品可能遭受人为污染的影响。地质累积指数分析结果显示,贵阳市12%的表层土壤未受汞的污染,37%的表层土壤在无污染到中度污染之间,36%的中度污染,11%的表层土壤介于中度污染到强污染之间,2%的强污染,1%的介于强污染到极强污染之间。污染程度指数分析显示,贵阳市56.1%的表层土壤未受到汞的污染,汞的污染程度最大为45.87,总污染程度大于0(即受到污染)。

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