Trace Metal Pollution in Topsoil Surrounding the Xiangtan Manganese Mine Area (South-Central China): Source Identification, Spatial Distribution and Assessment of Potential Ecological Risks.
Trace Metal Pollution in Topsoil Surrounding the Xiangtan Manganese Mine Area (South-Central China): Source Identification, Spatial Distribution and Assessment of Potential Ecological Risks.
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湘潭锰矿区周边表土微量金属污染（中南地区）：来源识别、空间分布及潜在生态风险评估
DOI：
10.3390/ijerph15112412
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发表时间：
2018-10-31
影响因子：
--
通讯作者：
Zhou Y
中科院分区：
文献类型：
--
作者：
Jiang F;Ren B;Hursthouse AS;Zhou Y
以湖南省湘潭市典型锰矿区为研究对象，分析了锰矿区土壤中痕量金属的来源、空间分布特征，并对其潜在生态风险进行了评价。测定了研究区表层土壤中Mn、Cu、Pb、Zn、Cd、Ni、Cr和Hg的含量。除Cr和Hg外，其余微量元素均超过湖南省土壤背景值。利用GIS技术对土壤中微量金属元素的空间分布进行了可视化，结果表明，表层土壤中微量金属元素主要集中在矿山和冶炼厂附近。利用空间分布、趋势分析、Pearson相关分析和主成分分析确定了两组微量金属元素：Mn、Cu、Pb、Zn、Cd和Ni可归因于工业和采矿活动，而Cr和Hg则为自然来源。研究结果还揭示了主导风向、尾矿侵蚀和雨水径流等次生过程的影响程度对痕量金属的扩散和迁移起着重要作用。此外，应用地累积指数和潜在生态风险指数（PERI）对研究区重金属污染的环境风险进行了评价。在主要锰矿区，相关金属的累积PERI处于最高风险水平。锰矿区周围的风险降至中度，突出了进一步风险管理关注的位置。此外，近80%的潜在生态风险来自整个研究区的镉。
In this study, we identified the sources of trace metals, investigated their spatial distribution in topsoil and assessed their potential ecological risk in the area surrounding a typical manganese mining area in Xiangtan, Hunan Province, China. The concentrations of Mn, Cu, Pb, Zn, Cd, Ni, Cr and Hg in the topsoil of the study area were measured. Except for Cr and Hg, all trace metals exceeded the corresponding soil background values for Hunan Province. The spatial variation in trace metals was visualized by GIS, and the results show that trace metals in topsoil are enriched mainly around mines and smelters. Two groups of trace metals were identified using the spatial distribution, trend analysis, Pearson’s correlation and principal component analysis: Mn, Cu, Pb, Zn, Cd and Ni can be attributed to industrial and mining activities, whereas Cr and Hg are of natural origin. The results also revealed the extent of the influence of secondary processes such as the prevailing wind direction, erosion of mine tailings and rainwater runoff play significant roles in the wider dispersal and transfer of trace metals. In addition, the environmental risk of metal pollution was evaluated by applying the geoaccumulation index and potential ecological risk index (PERI) to the study area. The accumulated PERI for metals of concern is at highest risk level in the main manganese mine area. This decreases to a moderate risk around the manganese mine area, highlighting locations for further risk management concern. Furthermore, nearly 80% of the potential ecological risk was from Cd across the study area.
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