某电镀厂地块重金属污染特征与健康风险空间分布评价

Pollution characteristics and spatial distribution evaluation of the health risk of heavy metals in an electroplating plant site

  • 摘要: 以苏州某电镀地块为研究对象,运用内梅罗指数法评估土壤样品中As、Cd、Pb、Cu、Ni、Zn、Hg、Cr(Ⅵ) 8种重金属的污染程度,明确了该电镀厂土壤受到Ni和Cr(Ⅵ)的污染。基于健康风险模型和克里金插值法研究土壤中Ni和Cr(Ⅵ)的三维空间健康风险分布。结果表明:四车间(挂镀镍、铬)Ni和Cr(Ⅵ)的致癌和非致癌风险水平均超过可接受阈值,Ni与Cr(Ⅵ)污染呈点源扩散,离四车间(污染区域)越远,其污染程度越低;从纵向来看,Ni与Cr(Ⅵ)都存在由表层向深层土壤迁移的行为。建议该地块在开发利用前对土壤进行修复治理。

     

    Abstract: Taking an electroplating site in Suzhou City as the research object, the pollution degree of eight heavy metals (As, Cd, Pb, Cu, Ni, Zn, Hg, Cr(Ⅵ)) in soil samples was evaluated by using Nemero index method, and it was clear that the soil of the electroplating plant was polluted by Ni and Cr(Ⅵ). Based on the health risk model and Kriging interpolation method, the three-dimensional spatial health risk distribution of Ni and Cr(Ⅵ) in soil was studied. The results showed that the carcinogenic and non-carcinogenic risk levels of Ni and Cr(Ⅵ) in Workshop Four (rack plating of nickel and chromium) exceeded the acceptable threshold. The pollution of Ni and Cr(Ⅵ) showed a pattern of point source diffusion. The farther the distance from Workshop Four (polluted area), the lower the pollution degree. From the vertical perspective, both Ni and Cr(Ⅵ) presented the behavior of migration from the surface to the deep soil. Therefore, it was necessary to remediate the soil before development and utilization.

     

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