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密云水库上游铁矿区重金属在胡敏酸中的分布特征研究

DOI: 10.11654/jaes.2015.02.009

Keywords: 重金属 胡敏酸 分布特征 相关性 富集因子

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Abstract:

以北京市密云水库上游铁矿区为研究对象,研究了不同深度(0~20 cm和20~40 cm)土壤样品和胡敏酸中重金属的分布特征以及重金属与胡敏酸之间的相关性.根据国际腐殖质协会提供的胡敏酸提取方法从土壤样品中提取胡敏酸,使用ICP-MS测定了土壤样品和胡敏酸中重金属V、Cr、Co、Ni、Cu、Zn、Cd和Pb的含量,并使用相关性分析法和富集因子法研究了重金属和胡敏酸之间的相互关系.结果表明:土壤样品中V、Cr、Co、Ni、Cu、Zn、Cd和Pb在0 ~20 cm的平均含量高于20~40 cm;胡敏酸中V、Co、Ni、Cu、Zn和Pb在0~20 cm的平均含量高于20~40 cm,Cr和Cd则相反.相关性分析表明V、Cr、Co、Ni、Cu、Cd和Pb的含量与有机质含量和胡敏酸含量均表现出显着相关性,V、Co、Cu、Cr、Ni和Zn的含量与胡敏酸和有机质含量之比(HA/OM)呈负相关.富集因子分析表明胡敏酸对V、Cr、Ni、Zn和Pb的结合能力不强,而对Cu元素的结合能力很强;0~20 cm的胡敏酸对V、Cr、Co、Ni、Cu、Zn和Pb的富集程度高于20~40 cm,Cd则在20~40 cm的胡敏酸中富集程度更高

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