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首页> 外文期刊>Chemosphere >Source identification of arsenic contamination in agricultural soils surrounding a closed Cu smelter, South Korea
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Source identification of arsenic contamination in agricultural soils surrounding a closed Cu smelter, South Korea

机译：韩国封闭式铜冶炼厂周围农业土壤中砷污染的来源鉴定

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Arsenic sources were identified in As-contaminated soils 4 km-7 km from a closed Cu smelter. Host rocks, heavy minerals in contaminated soils, ore minerals in quartz veins (geogenic sources) and bottom ash from the Cu smelter (an anthropogenic source) were investigated as potential sources. As a result, heavy minerals and bottom ash were found to contain higher As concentrations than the contaminated soils. Some of the host rock samples also showed higher As levels than the contaminated soils. Arsenopyrite was one of the frequently detected ore minerals in quartz veins. The As concentrations in soils did not decrease with soil depth or distance from the smelter. These results imply that the atmospheric emission from the smelter was not a major arsenic source. Based on the geochemical investigation and Pb isotopic analysis, the As contamination was affected by both regional ore mineralization and the host rock, and the influence of the smelter was limited. The spatial analysis of As concentrations and Pb isotopic ratios suggested that As contamination was mainly due to regional ore mineralization. The Pb-206/Pb-207 and Pb-206/Pb-204 ratios of the contaminated soils were plotted on the mixing line between background soils and ore minerals. The source apportionment results indicated a significant contribution of regional ore mineralization (average 52.9 +/- 303%) to the As contamination. The contribution of this study is that we identified that the major source of soil contamination was of geologic origin despite an anthropogenic source nearby using geochemical and Pb isotopic investigation. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在一个封闭的铜冶炼厂的4 km-7 km处，被砷污染的土壤中发现了砷源。调查了潜在岩石，宿主岩，污染土壤中的重矿物，石英脉中的矿石矿物（地质来源）和铜冶炼厂（人为来源）的底灰。结果，发现重矿物和底灰比被污染的土壤含有更高的砷浓度。一些宿主岩石样品还显示出比受污染土壤更高的砷含量。毒砂是石英脉中经常被发现的矿石矿物之一。土壤中的砷浓度不会随土壤深度或距冶炼厂的距离而降低。这些结果表明，冶炼厂的大气排放不是主要的砷源。根据地球化学调查和铅同位素分析，砷污染既受到区域矿石矿化和宿主岩的影响，也限制了冶炼厂的影响。砷浓度和铅同位素比的空间分析表明，砷污染主要是由于区域矿石矿化。在背景土壤和矿石矿物之间的混合线上绘制了被污染土壤的Pb-206 / Pb-207和Pb-206 / Pb-204比。来源分配结果表明，区域性矿石矿化（平均52.9 +/- 303％）对砷污染有重要贡献。这项研究的贡献在于，尽管使用地球化学和Pb同位素调查发现了附近的人为污染源，但我们还是发现土壤污染的主要来源是地质源。 （C）2018 Elsevier Ltd.保留所有权利。

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