| 青岛北站规划区原场地表层土壤重金属污染研究 |
| 摘要点击 2033 全文点击 1225 投稿时间：2012-08-07 修订日期：2012-10-16 |
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| 中文关键词 青岛北站 土壤重金属 地质累积指数 嵌入Igeo综合指数 健康风险评价 |
| 英文关键词 Qingdao North Station soil heavy metal geoaccumulation index embedded Igeo composite index health risk assessment |
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| 中文摘要 |
| 污染程度确定及健康风险评价是重金属污染场地修复的前提. 调查了青岛北站规划区Cu、Cr、Pb、Cd、Zn、Ni这6种重金属含量,并对重金属含量进行相关性分析; 以人为影响倍数来表征污染物超过背景值的程度,采用地质累积指数法以及内梅罗指数中嵌入Igeo综合指数的新方法对土壤污染状况进行评价; 最后利用健康风险评价模型对重金属含量进行人体健康风险评价. 结果表明,规划区土壤均有不同程度的重金属污染,6种重金属污染程度依次为:Cd>Cu>Ni>Pb>Cr>Zn,其中Cd达到了严重污染的程度,Cu、Ni次之,Cr、Pb、Zn污染轻微; 各元素总体平均变异程度为Cd>Ni>Cr>Zn>Pb>Cu; 研究区内土壤各重金属分布特征不尽相同,但总体上差异不大. 土壤重金属非致癌风险大小为Cr>Pb>Cu>Ni>Cd>Zn,均小于风险阈值1; 致癌风险Ni>Cd,均低于致癌风险阈值,各重金属污染不会对人体健康造成威胁. |
| 英文摘要 |
| The determination of pollution extent and health risk assessment are the premise of heavy metal contaminated site remediation. The content of Cu、Cr、Pb、Cd、Zn、Ni in Qingdao North Station was detected, and the correlation of the 6 kinds of heavy metal content was analyzed. The pollution extent in excess of background values was characterized by anthropogenic influence multiple,and the pollution of heavy metal in soil was evaluated using geoaccumulation index and a new method which connects geoaccumulation index with Nemero index. Finally, human health risk assessment was carried out with health risk assessment model for heavy metal content. The results showed that Qingdao North Station soil were polluted by heavy metals. Six heavy metal pollution levels were: Cd>Cu>Ni>Pb>Cr>Zn, and Cd had reached the severity pollution level, Cu and Ni followed by, Cr, Pb and Zn were in minor pollution level. The order of coefficient variation in all heavy metals was: Cd>Ni>Cr>Zn>Pb>Cu. Within the study area soil heavy metal distribution was different, but overall discrepancy was small. The order of non-cancer hazards of heavy metals in soil was Cr>Pb>Cu>Ni>Cd>Zn,and the order of carcinogen risks of heavy metals was Ni>Cd. The non-cancer hazard and carcinogen risks values of metals were both lower than that their threshold values. They were not the direct threats to human health. |
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