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采集郑开轻轨两侧土壤样品260个,用ICP-MS法测定土壤Cu、Cr、Pb、Ni、Cd、Co、V和Zn含量,用ICP-AES法测定土壤Al和As含量,用内梅罗污染指数法展开重金属污染评估,用健康风险评价模型展开重金属健康风险评价。结果表明:郑开轻轨两侧土壤Al、Cd、Co、Cr、Cu、Zn、Pb、Ni、V和As含量的变异系数变化在12.52%~86.57%之间,为中等变异,南北两侧断面上土壤As超标,其余重金属含量都在二级标准以下,不存在超标现象;轻轨两侧200 m范围内土壤重金属污染综合指数I普遍大于1小于2,为轻污染,且轻轨南侧土壤重金属污染程度均高于北侧,土壤As对综合污染指数的贡献最大;轻轨两侧土壤9种重金属的HQ值和HI值均小于1,短期内不会对居民健康产生非致癌风险;轻轨两侧土壤260个采样的CR_(As)和TCR都大于10~(-6),存在一定的人体可耐受的致癌风险,As对TCR的贡献率平均高达85.90%,As是最主要的致癌风险因子。
260 soil samples were collected from both sides of Zhengkai Light Rail. The contents of Cu, Cr, Pb, Ni, Cd, Co, V and Zn in soil were measured by ICP-MS. The contents of Al and As in soil were determined by ICP- Lo pollution index method to carry out heavy metal pollution assessment, with the health risk assessment model to carry out heavy metal health risk assessment. The results showed that the coefficients of variation of Al, Cd, Co, Cr, Cu, Zn, Pb, Ni, V and As in the soil were 12.52% ~ 86.57% On the other hand, soil As exceeded the standard, and the contents of other heavy metals were below Grade II standard. There was no over-standard phenomenon. The comprehensive index I of soil heavy metal pollution within 200 m on both sides of light rail was generally more than 1 and less than 2, light pollution and heavy metal pollution Soil As was the largest contributor to the comprehensive pollution index. The HQ and HI values of nine heavy metals in soil on both sides of light rail were all less than 1, which would not cause non-carcinogenic risks to residents’ health in the short term. There were some human-tolerable oncogenic risks for 260 samples with CR_ (As) and TCR of more than 10 ~ (-6). The contribution rate of As to TCR was as high as 85.90%, and As was the most important oncogenic risk factor.