| 铅稳定同位素在土壤污染物来源识别中的应用 |
| 摘要点击 4885 全文点击 2608 投稿时间：2008-02-22 修订日期：2008-04-25 |
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| 中文关键词 铅 稳定同位素 土壤污染物 污染源识别 |
| 英文关键词 lead stable isotope soil pollutants source identification |
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| 中文摘要 |
| 稳定同位素是追踪土壤重金属来源的重要手段.根据地统计学研究结果，在某重金属污染场地采集了11个表层土壤样品，它们的Pb浓度呈梯度分布，最大值超过2 000 μg·g-1.对土壤样品中4种Pb稳定同位素的含量进行了分析，以了解研究区土壤Pb的主要来源.结果表明，土壤样品206Pb/207Pb、 208Pb/204Pb和206Pb/204Pb与Pb浓度的倒数，206Pb/204Pb与208Pb/204Pb都呈显著的线性正相关关系，这些关系符合二元混合模型，由此可以推断土壤铅主要源于人为排放和土壤母质. |
| 英文摘要 |
| Stable isotopes are key importance for tracing the source of heavy metals in soils. 11 surface soil samples were collected in a contaminated site according to geostatistical results, which had a series of concentrations from almost background value of Pb to more than 2 000 μg·g-1. Pb stable isotope composition of the soil samples was analyzed to imply the sources. The results showed that 206Pb/207Pb, 208Pb/204Pb and 206Pb/204Pb of soil samples were all remarkably correlated linearly with reciprocals of Pb concentration, and 206Pb/204Pb had a significant positive linear correlation with 208Pb/204Pb, which was consistent with binary mixing model. It can be inferred that soil Pb mainly came from two sources, an anthropogenic source and soil parent material. |
