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Risk assessment and source identification of heavy metals in agricultural soil: a case study in the coastal city of Zhejiang Province, China

文献类型： 外文期刊

作者： Ren, Zhouqiao 1 ; Xiao, Rui 3 ; Zhang, Zhonghao 4 ; Lv, Xiaonan 1 ; Fei, Xufeng 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, 198 Shiqiao Rd, Hangzhou 310021, Zhejiang, Peoples R China

2.Minstry Agr & Rural Affairs, Key Lab Informat Traceabil Agr Prod, Beijing, Peoples R China

3.Wuhan Univ, Sch Remote Sensing & Informat Engn, Wuhan, Hubei, Peoples R China

4.Shanghai Normal Univ, Inst Urban Studies, Sch Environm & Geog Sci, Shanghai 200234, Peoples R China

关键词： Heavy metal; Source analysis; Pollution assessment; GeogDetector model

期刊名称：STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT （ 影响因子：3.379； 五年影响因子：3.348 ）

ISSN： 1436-3240

年卷期： 2019 年 33 卷 11-12 期

页码：

收录情况： SCI

摘要： Heavy metal contamination is a serious environmental problem, especially in developing countries such as China. In this study, we collected 1928 soil samples from the southeastern coastal area of China and analyzed the pollution concentration and potential ecological risk from heavy metals including arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), and mercury (Hg). The mean concentrations of Cr, Hg, and Pb were lower than their corresponding background values, whereas As and Cd were 1.31 and 1.59 times their background values, respectively. The calculation of the mean Pollution Index (PI) for these heavy metals were, in decreasing order Cd (1.59), As (1.31), Cr (0.94), Pb (0.89), and Hg (0.78) and the Nemerow Integrated Pollution Index revealed that almost one-fifth of the soil in the study area was moderately polluted. According to the ecological risk index, about 12% of the soil was at a moderate or high ecological risk, and Cd and Hg presented the highest ecological risk. The GeogDetector software was used to quantitatively assess the potential sources of these metals. The GeogDetector results showed that the soil heavy metals have various sources, including: natural processes had significant impacts on all heavy metals analyzed in this study; farmland types influenced the concentrations of As and Cr significantly; industrial activities significantly increased As, Cr, and Hg; transportation-related activities increased As, Cd, and Hg; and agricultural application of fertilizer and pesticides, had significant impacts on As, Cd, and Pb levels. Based on the results of the interaction detector, natural processes and agricultural activities were determined to be the main sources of heavy metals in the study area.

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