豫北某煤矿区土壤重金属污染特征及风险评价

    Characteristics and risk assessment of soil heavy metal pollution in a coal mining area in North Henan Province

    • 摘要: 为研究豫北地区典型煤矿区土壤重金属污染程度及风险状况,对土壤重金属Cd、Pb、Cu、Zn、As和Hg的含量进行测定,分析其污染特征,利用潜在生态风险指数法对其风险状况进行评价,根据相关系数法及克里金空间插值法分析重金属污染来源及空间分布特征。研究结果表明,研究区土壤样品中重金属属于强变异及中等变异,受人为影响因素显著;六种重金属含量均超过区域土壤背景值,污染较为明显的为Cd与Pb,Cd、Pb的超风险筛选值率分别为56.25%、6.25%,为重度污染状况。生态风险等级为低、较高、高和极高的重金属分别为Cd与Hg、Zn、As与Cu、Pb。研究区的综合潜在生态风险指数为892.86,处于极高风险等级;Cd、Pb、As和Hg空间分布特征有很大的相似性,均由南向北逐渐递减;建议重点关注Cd和Pb的生态风险及污染防控。

       

      Abstract: To study the degree and risk status of heavy metal pollution in soil of typical coal mining areas in North Henan Province, the content of heavy metals Cd, Pb, Cu, Zn, As, and Hg in soil is measured, and their pollution characteristics are analyzed. The potential ecological risk index method is used to evaluate their risk status, and the sources and spatial distribution characteristics of heavy metal pollution are analyzed using the correlation number method and Kriging interpolation method. The results indicate that heavy metals in soil samples from the study area belong to strong and moderate variability, and are significantly influenced by human factors. The content of six heavy metals exceeds the regional soil background value, with Cd and Pb being the most polluted. The high-risk screening values for Cd, Pb are 56.25%, 6.25%, respectively, indicating a severe pollution situation. The heavy metals with low, relatively high, high, and extremely high ecological risk levels are Cd and Hg, Zn, As and Cu, and Pb, respectively. The potential comprehensive ecological risk index of the research area is 892.86, which is at a very high risk level. The spatial distribution characteristics of Cd, Pb, As, and Hg have significant similarities, all gradually decreasing from south to north. It is recommended to focus on the ecological risks and pollution prevention and control of Cd and Pb.

       

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