Spatial distribution and risk assessment of heavy metals in contaminated paddy fields - A case study in Xiangtan City, southern China

文献类型： 外文期刊

第一作者： Jiang, Luhua

作者： Jiang, Luhua;Xu, Liangfeng;Hao, Xiaodong;Zhang, Siyuan;Xu, Menglong;Zhu, Ping;Fu, Shaodong;Liang, Yili;Yin, Huaqun;Liu, Xueduan;Liu, Hongwei;Bai, Lianyang;Jiang, Huidan;Deng, Yan;Jiang, Luhua;Xu, Liangfeng;Hao, Xiaodong;Zhang, Siyuan;Xu, Menglong;Zhu, Ping;Fu, Shaodong;Liang, Yili;Yin, Huaqun;Liu, Xueduan;Liu, Hongwei

作者机构：

关键词： Heavy metals; Spatial distribution; Chemical fractions; Environmental risk assessment; Cancer risk; Paddy soils

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2019 年 171 卷

页码：

收录情况： SCI

摘要： An extensive investigation on spatial distribution and environmental risk assessment based on total content and fractions of heavy metals, as well as the cancer risk of Cd from seven adjacent contaminated paddy fields at Xiangtan City, southern China, was conducted in this study. A total of 63 soil samples were analyzed for soil physical properties and concentrations of eight heavy metals (Cd, Cr, Co, Cu, Mn, Ni, Pb, Zn). The results showed that concentrations of metals except for Cr, Mn and Ni exceeded the background values to varying degrees, and particularly, content of Cd was as 57.4-612 times higher than background values. Principal components analysis and correlation analysis revealed three groups: industry activities for Cd and Zn; natural sources mainly for Cu, Pb, Ni and Cr, with some slight anthropogenic activities for Cu and Pb accumulation; and manganese ore associated with cobalt for Co and Mn. Combined with different indices, Cd and Zn were the major contributors to the ecological risk, and cancer risk of Cd indicated an unacceptable degree in this area. Altogether, results from this study will facilitate a better understanding of metals distribution characteristics and provide a scientific basis for further comprehensive management for these paddy fields. Combination of functional microbial agent and plants promises to be a feasible and effective remediation method for cadmium pollution in the study area.

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