| 利用铅同位素方法量化不同端元源对南京土壤和长江下游悬浮物铅富集的影响 |
| 摘要点击 2493 全文点击 1968 投稿时间：2014-04-15 修订日期：2014-06-20 |
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| 中文关键词 铅同位素 长江 南京 土壤 悬浮物 污染 |
| 英文关键词 lead isotopes the Yangtze River Nanjing soil suspended matter contamination |
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| 中文摘要 |
| 环境中铅污染及其地球化学行为关系到生态环境安全和人类健康. 利用地球化学同位素方法研究长江下游典型地区土壤和河流悬浮物中铅富集特征和成因，量化不同端元源对铅富集的影响，对于环境科学发展以及铅污染治理具有重要促进意义. 结果表明，南京城区表层土壤和长江下游悬浮物中的铅相对于当地背景土壤呈现出富集特征. 土壤和悬浮物的铅同位素相对于自然端元具有较高的206Pb/207Pb和较低的208Pb/206Pb比值，为受到了人为铅输入影响的缘故. 铅同位素地球化学端元识别模型估算表明，南京市区土壤中的铅有18%~56%（平均35%）来自人为端元源，而长江下游悬浮物样品中铅的人为端元源贡献率为22%~46%（平均32%）. |
| 英文摘要 |
| Lead pollution and its geochemical behavior have an influence on ecological environment and human health. It is of significance to study the characteristics and mechanism of Pb accumulation and to quantify the contributions of different environmental matrices to Pb accumulation in soils and river suspended matter in the representative fluvial delta area, such as the lower of the Yangtze River. The results showed that lead was enriched in the urban topsoil in Nanjing and the suspended matter in the lower of the Yangtze River. The urban topsoil and the river suspended matter showed higher 206Pb/207 Pb and lower 208Pb/206Pb relative to the natural matrices, and this was resulted from the influence of the anthropogenic lead. The relative contribution of separate Pb sources was assessed with the Pb geochemical model, 18%-56% (average 35%) Pb in Nanjing urban soil was derived from the anthropogenic matrices, and anthropogenic Pb contributed 22%-46% (average 32%) of total Pb in the Yangtze River suspended matter. |
