Abandoned mine sites as a source of contamination by heavy metals:: A case study in a semi-arid zone
Abandoned mine sites as a source of contamination by heavy metals:: A case study in a semi-arid zone
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DOI：
10.1016/j.gexplo.2007.04.011
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发表时间：
2008-02-01
影响因子：
3.9
通讯作者：
Bech, J.
中科院分区：
文献类型：
--
作者：
Navarro, M. C.;Perez-Sirvent, C.;Bech, J.
采矿和磨矿作业，包括磨矿、浓缩矿石和尾矿的处理，以及矿山和磨矿厂的废水，是地表环境中明显的污染源。在半干旱地区，由于土壤通常几乎没有植被，诸如暴雨事件等气候效应对金属的扩散有很大的影响。对西班牙东南部Cabezo Rajao废弃矿山材料中存在的可溶性和颗粒金属的分散和影响进行了评估。对尾矿和土壤进行了pH、EC、CaCO3、粒度、矿物组成和重金属含量的采样和分析，同时对水样进行了pH、EC、可溶性金属和盐的采样和分析。固体样品中Pb、Zn、Cd、Cu和As的平均浓度分别为8.3 g kg（-1）、12.5 g kg（-1）、40.9 mg kg（-1）、332.1 mg kg（-1）、314.7 mg kg(-1)；水样中Pb、Zn、Cd、Cu和As的平均浓度分别为1.5 mg l（-1）、50.3 mg l（-1）、13.6 g l（-1）、17.2 mg l（-1）、1.7 mg l（-1）。这些金属可以在降雨后从尾矿中被水分散到下游和下坡。对Mar Menor泻湖周围采集的土壤样本进行了分析，反映了Cabezo Rajao可溶性和颗粒物质运输的影响，特别是Pb和Zn。然而，矿区周围土壤中大量碳酸盐的存在揭示了所研究的所有金属的稳定性。(c) 2007 Elsevier B.V.版权所有
Mining and milling operations, including grinding, concentrating ores and disposal of tailings, along with mine and mill waste water, provide obvious sources of contamination in the surface environment. Climatic effects such as heavy rainfall events, have a great impact in the dispersion of metals in semi-arid areas, since soils are typically scarcely vegetated. The dispersion and influence of soluble and particulate metals present in the materials from an abandoned mine, Cabezo Rajao, in SE Spain, was evaluated. Tailings and soils were sampled and analysed for pH, EC, CaCO3, grainsize, mineralogical composition and heavy metal content, while water samples were collected and analysed for pH, EC, soluble metals and salts. The mean concentrations of Pb, Zn, Cd, Cu and As in solid samples were 8.3 g kg(-1), 12.5 g kg(-1), 40.9 mg kg(-1), 332.1 mg kg(-1), 314.7 mg kg(-1) respectively, and 1.5 mg l(-1), 50.3 mg l(-1), 13.6 g l(-1), 17.2 mg l(-1), 1.7 mg l(-1) in water samples respectively. These metals can be dispersed downstream and downslope from the tailings by water after rainfall. Soil samples collected in the surroundings of Mar Menor Lagoon were analysed, reflecting the influence of the transport of soluble and particulate materials from Cabezo Rajao, especially of Pb and Zn. However, the presence of high amounts of carbonate in the soils around the mine area revealed the stabilization of all the metals studied. (c) 2007 Elsevier B.V. All rights reserved.