| 太原市汾河河岸带土壤重金属分布特征、评价与来源解析 |
| 摘要点击 2363 全文点击 799 投稿时间：2021-07-31 修订日期：2021-10-14 |
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| 中文关键词 河岸带 重金属含量 分布特征 风险评价 源解析 |
| 英文关键词 riparian zone heavy metal content distribution characteristics risk assessment source analysis |
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| 中文摘要 |
| 为了解太原城区段汾河河岸带土壤中重金属污染现状，分析了太原城区段汾河西岸河岸带表层土壤6种重金属元素（Cd、Cr、Pb、Cu、Zn和Hg）的含量状况及其分布特征，利用单因子污染指数法、地累积指数法和潜在生态风险指数法对重金属的污染程度及其生态风险进行评价，并用相关性分析、主成分分析和聚类分析进行源解析.结果表明，太原城区段汾河西岸河岸带土壤中Cr和Cu的均值低于山西省土壤背景值，Cd、Pb、Zn和Hg的均值超过背景值，Cd和Hg的点位超标率大于90%.沿河流方向，6种重金属含量降低，高值在二期北延段C断面.污染评价结果表明，Hg具有强生态危害，Cd具有中等强度生态危害，其它4种重金属是轻微生态危害，各样点综合潜在生态风险为中等.相关性分析、主成分分析和聚类分析结果表明，Zn、Pb和Cd具有同源性，主要受交通运输、农业生产活动和矿业活动等人为源的影响；Hg和Cu来源相似，污染源为工业生产，并且Cu在一定程度上受交通运输和农业活动的影响；Cr的污染源是成土母质和工业生产. |
| 英文摘要 |
| To improve understanding of the present situation of heavy metal pollution in the soil of the riparian zone of the Fenhe River in the urban section of Taiyuan, this study analyzed the west bank of the Fenhe River in the urban section of Taiyuan with surface soil heavy metal (Cd, Cr, Pb, Cu, Zn, and Hg) contents and distribution characteristics, using the single factor pollution index method, geo-accumulation index, and potential ecological risk index method to assess pollution degree and ecological risk. Correlation analysis, principal component analysis, and cluster analysis were used for source analysis. The results showed that the mean values of Cr and Cu in the soil of the west bank of the Fenhe River in the Taiyuan urban section were lower than the background values of soils in Shanxi Province, whereas the mean values of Cd, Pb, Zn, and Hg exceeded the background values, and the over-standard rate of Cd and Hg was more than 90%. Along the river direction, the contents of the six heavy metals decreased, and the high values were in the C section of the north extension of the second phase. The results of the pollution assessment showed that Hg was a strong ecological hazard, Cd was a moderate ecological hazard, and the other four heavy metals were slight ecological hazards, and the comprehensive potential ecological risk of each sample was moderate. The results of correlation analysis, principal component analysis, and cluster analysis showed that Zn, Pb, and Cd were homologous and were mainly affected by human sources, including transportation, agricultural production activities, and mining activities. The sources of Hg and Cu were similar, largely industrial production, and Cu was affected by transportation and agricultural activities to a certain extent. The pollution sources of Cr were soil parent material and industrial production. |
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