【摘要】 对某市化工厂土壤重金属汞、砷、铜、镉、铅、镍的分布特征及污染风险进行调查研究。结果表明：研究区域水平方向汞超过了背景值，砷、镉、铜均未超过背景值，镉、铜、铅、镍含量起伏较大；垂直方向，整体上6种重金属在土壤中的含量随着土壤深度增加，重金属含量逐步降低。从累积系数看，镍和汞出现累积现象；从变异系数看，铅属于强变异。采用单因子污染指数与内梅罗综合污染指数、地质累积指数和潜在生态风险指数3种评价方法进行评价，S2点镍和S4点铅出现轻度污染或者累积，汞处于中等危害。更多还原

【Abstract】 In this paper, the distribution characteristics and pollution risk of heavy metals, including Hg, As, Cu, Cd, Pb and Ni in soil of a chemical plant in a city were investigated.The results showed that in the horizontal direction of the study area, the pollution level of Hg exceeded the background value, but As, Cd and Cu did not, and Cd, Cu, Pb and Ni contents fluctuated greatly.In the vertical direction, as a whole, the contents of six heavy metals in soil gradually decreased with the increase of soil depth.According to the analysis result of the Accumulation Coefficient, there was an accumulation of Ni and Hg.From the Coefficient of Variation, the accumulation coefficient of lead was at the level of strong variation.Using three evaluation methods: Single Factor Pollution Index, Nemerow Composite Pollution Index, Geological Accumulation Index and Hakanson Potential Ecological Risk Index, Ni(S2) and Pb(S4) were slightly polluted or accumulated, while Hg was in a medium hazard.更多还原