应用铅锶同位素示踪研究泉州某林地垂直剖面土壤中重金属污染及来源解析

发布时间：2018-06-05 05:43

本文选题：重金属 + 铅锶同位素示踪　；参考：《环境科学》2017年04期

【摘要】：分别用原子吸收光谱仪(AAS)和电感耦合等离子体质谱仪(ICP-MS)分析了泉州市某林地垂直剖面土壤中8种重金属元素(Sr、Ni、Fe、Cr、Cu、Mn、Pb、Zn)的含量及垂直剖面土壤的铅锶同位素组成,并采用BCR四步提取法对重金属形态进行了分析.重金属总量及形态分析结果表明,泉州市林地土壤重金属污染较轻,主要污染因子为Sr.Pb的非残渣态含量最高,活性最大.内梅罗综合污染指数的评价结果表明,Sr在0~60 cm深度处达到重度污染.次生相与原生相比值法评价结果表明,Pb活性最强,对土壤的潜在危害最大;富集因子计算结果表明,Pb、Sr、Mn、Zn受到外源的影响;因子分析结果表明,重金属主要受到交通源、自然源和农业生产的影响.根据垂直剖面土壤样品与泉州市潜在污染源在~(206)Pb/~(207)Pb-~(207)Pb/~(204)Pb图中的分布特征,Pb主要来源于汽车尾气尘和土壤母质层,利用铅同位素二元混合模型计算出土壤母质层对垂直剖面土壤中铅的贡献率为85.14%(62.53%~98.36%),汽车尾气尘的贡献率平均值为14.86%(1.640%~37.47%).锶同位素示踪结果表明,锶主要来源于汽车尾气尘和土壤母质.铅锶同位素联合示踪结果与前述研究一致.
[Abstract]:The content of 8 heavy metal elements (Sr, Ni, Fe, Cr, Cu, Mn, Pb, Zn) in a vertical section of a forest land in Quanzhou and the lead strontium isotopes in vertical profile soil were analyzed by atomic absorption spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS), and the heavy metal morphology was analyzed by BCR four step extraction. The results of quantitative and morphological analysis showed that the heavy metal pollution in the woodland soil of Quanzhou was light, the main pollution factor was the highest content of non residue and the maximum activity of Sr.Pb. The evaluation results of the comprehensive pollution index of inner Melo showed that Sr reached severe pollution at the depth of 0~60 cm. The evaluation results of secondary phase compared with raw material showed that the Pb activity was the strongest, and the results showed that the activity of Pb was the strongest. The potential damage of soil is the largest, and the results of enrichment factor calculation show that Pb, Sr, Mn, and Zn are affected by exogenous factors; factor analysis results show that heavy metals are mainly affected by traffic sources, natural sources and agricultural production. According to the distribution characteristics of the vertical profile soil samples and the potential pollution sources of Quanzhou city in ~ (206) Pb/~ (207) Pb-~ (207) Pb/~ (204) Pb diagram, Pb mainly comes from the automobile exhaust dust and the soil parent layer. The contribution rate of the soil parent layer to the vertical section soil is 85.14% (62.53%~98.36%), and the contribution rate of the automobile exhaust dust is 14.86% (1.640%~37.47%). The results of strontium isotope tracer show that the strontium is mainly from the automobile exhaust. The results of joint tracer of Pb, Sr and isotopes are consistent with the previous studies.
【作者单位】：华侨大学环境科学与工程系;泉州师范学院资源与环境科学学院;核工业北京地质研究院分析测试研究中心;
【基金】：国家自然科学基金项目(21177043,21377042) 福建省自然科学基金项目(2015J01147) 泉州市科技计划项目(2014Z130)
【分类号】：X53

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