Xie Qing, Ren Bozhi, Hursthouse Andrew, Shi Xiyang
School of Resources & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China.
Hunan Xiang'an Exploration Design Co., Ltd., Changsha, Hunan, China.
Integr Environ Assess Manag. 2022 May;18(3):748-756. doi: 10.1002/ieam.4514. Epub 2021 Sep 23.
In this study, we analyzed 53 topsoil samples from the Xikuangshan South Mine in Hunan Province to investigate the distribution characteristics of pH and the concentrations of selected metals to determine the controlling factors and identify their sources. Kriging interpolation, correlation analysis, principal component analysis, the index of the geoaccumulation index, and Hakanson's potential ecological risk were applied. The results show that the mean values of Pb, As, Cd, and Sb in the study area were larger than the background value of mountain soil in Hunan Province, and only the average Cr concentration was slightly lower than the background value. The spatial distributions of pH and five metals in the soil were very different, indicating that pH had no significant effect on the distribution of the metals. The wind, rivers, and land-use patterns in different regions of the study area may be the main reasons for their distribution patterns. The correlation component and principal component analysis revealed that Pb showed positive correlations with Cr and Cd, respectively, and Sb-As and Cr-Cd showed strong paired correlations. The cumulative proportion of the first two components accounted for 70.516% of the total variance, which suggests that mining activities are a major source of As and Sb, whereas Pb, Cr, and Cd were derived from natural and anthropogenic sources. The geoaccumulation index revealed that the major pollutants in the soils were mainly Cd, followed by Sb and As. The soils in the study area were moderately contaminated with Pb and lightly polluted by Cr. The ecological hazards of each metal in descending order were Cd > Sb > As > Pb > Cr. The index of the comprehensive potential ecological risk for metals indicated that the Xikuangshan South Mine is at or above a moderate ecological risk level, with an extremely strong potential for ecological risks posed by Cd and Sb. Integr Environ Assess Manag 2022;18:748-756. © 2021 SETAC.
在本研究中，我们分析了来自湖南省锡矿山南矿的53份表层土壤样本，以调查pH值及选定金属浓度的分布特征，确定控制因素并识别其来源。应用了克里金插值法、相关性分析、主成分分析、地累积指数和哈坎森潜在生态风险指数。结果表明，研究区域内铅、砷、镉和锑的平均值高于湖南省山地土壤背景值，仅铬的平均浓度略低于背景值。土壤中pH值和五种金属的空间分布差异很大，表明pH值对金属分布没有显著影响。研究区域不同地区的风、河流和土地利用模式可能是其分布格局的主要原因。相关性成分和主成分分析表明，铅分别与铬和镉呈正相关，锑 - 砷和铬 - 镉呈现出强配对相关性。前两个成分的累积比例占总方差的70.516%，这表明采矿活动是砷和锑的主要来源，而铅、铬和镉则来自自然和人为来源。地累积指数表明，土壤中的主要污染物主要是镉，其次是锑和砷。研究区域的土壤受到铅的中度污染和铬的轻度污染。各金属的生态危害程度由高到低依次为镉＞锑＞砷＞铅＞铬。金属综合潜在生态风险指数表明，锡矿山南矿处于或高于中度生态风险水平，镉和锑造成生态风险的潜力极强。《综合环境评估与管理》2022年；18:748 - 756。© 2021 SETAC。
