锑矿区土壤重金属污染分布特征及生态风险的影响
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湖南科技大学土木工程学院

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X53

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中国博士后科学基金,国家自然科学基金项目(面上项目,重点项目,重大项目),湖南省教育厅科学研究项目


Distribution and Ecological Risk Assessment of Heavy Metal Pollution in Soils in Antimony Mine Area
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School of Civil Engineering, Hunan University of Science and Technology

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    摘要:

    为了揭示矿业活动和生态修复措施对锑矿区土壤重金属污染的影响,调查了锡矿山锑矿区冶炼区、公路沿线区、采矿区及尾矿区中不同用地性质土壤中Sb、As、Pb及Cd等重金属含量,并用地累积指数法和潜在生态风险指数法对污染程度、潜在生态风险进行了评价。结果表明:锑矿区土壤样品中Sb、As、Pb及Cd的平均含量分别为3937.72 mg·kg-1,74.55 mg·kg-1,254.34 mg·kg-1和37.36 mg·kg-1,重金属复合污染严重;地累积指数法及潜在生态风险指数法评价表明锑矿区Sb和Cd污染严重,As、Pb有轻度到中度污染,综合具有极强的生态风险,其中Sb和Cd是最主要的污染因子。冶炼、开采、运输和堆放等矿业活动使各区域土壤的重金属浓度呈显著区域特征;废矿渣土壤、荒地、林地、底泥、生态修复草地和菜地等土壤样品中的重金属Sb含量依次减小,植物生态修复方法是治理土壤锑污染的一种有效手段。

    Abstract:

    In order to reveal the impact of mining activities and ecological restoration measures on soil heavy metal pollution in antimony mining areas, the pollution status and regional characteristics of Sb, As, Pb and Cd in soils of different land properties among smelting area, road nearby ore, mining area and ore tailing area of antimony mine area in Xikuangshan, Hunan were studied, in addition, the ground accumulation index method and the potential ecological risk index method were used to evaluate pollution and ecological risk. It was found that the average contents of Sb, As, Pb and Cd in soil samples in the study area were 3937.72 mg·kg-1, 74.55 mg·kg-1, 254.34 mg·kg-1 and 37.36 mg·kg-1 respectively, and heavy metal compound pollution were serious, which maintaining an upward trend; significant regional characteristics was showed by the heavy metal concentration in soils among each areas because of mining activities such as smelting, mining, transportation and stacking; the content of Sb in soil samples decreased successively in residue-field, wasteland, forestland, sediment, grassland and vegetable-field, which indicated that the method of grassland ecological restoration was an effective method to control soil antimony pollution. The evaluation results of the ground accumulation index method and the potential ecological risk index method showed that Sb and Cd pollution in antimony mining areas are serious, and As and Pb have mild to moderate pollution, and have strong ecological risks comprehensively, of which Sb and Cd are the most important pollution factors.

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  • 收稿日期:2019-12-28
  • 最后修改日期:2020-03-26
  • 录用日期:2020-04-07
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