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首页> 外文期刊>Environmental Science & Technology >Elevated Concentrations of U and Co-occurring Metals in Abandoned Mine Wastes in a Northeastern Arizona Native American Community
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Elevated Concentrations of U and Co-occurring Metals in Abandoned Mine Wastes in a Northeastern Arizona Native American Community

机译:亚利桑那州东北部美洲原住民社区废弃矿山废物中铀和共生金属的浓度升高

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摘要

The chemical interactions of U and co-occurring metals in abandoned mine wastes in a Native American community in northeastern Arizona were investigated using spectroscopy, microscopy and aqueous chemistry. The concentrations of U (67-169 μg L~(-1)) in spring water samples exceed the EPA maximum contaminant limit of 30 μg L~(-1). Elevated U (6,614 mg kg~(-1)), V (15,814 mg kg~(-1)), and As (40 mg kg~(-1)) concentrations were detected in mine waste solids. Spectroscopy (XPS and XANES) solid analyses identified U (Ⅵ), As (-Ⅰ and Ⅲ) and Fe (Ⅱ, Ⅲ). Linear correlations for the release of U vs V and As vs Fe were observed for batch experiments when reacting mine waste solids with 10 mM ascorbic acid (~pH 3.8) after 264 h. The release of U, V, As, and Fe was at least 4-fold lower after reaction with 10 mM bicarbonate (~pH 8.3). These results suggest that U-V mineral phases similar to camotite [K_2(UO_2)_2V_2O_8] and As-Fe-bearing phases control the availability of U and As in these abandoned mine wastes. Elevated concentrations of metals are of concern due to human exposure pathways and exposure of livestock currently ingesting water in the area. This study contributes to understanding the occurrence and mobility of metals in communities located close to abandoned mine waste sites.
机译:使用光谱学,显微镜和水化学方法研究了亚利桑那州东北部美国原住民社区废弃矿山废料中铀和共生金属的化学相互作用。泉水样品中的U(67-169μgL〜(-1))浓度超过了EPA的最大污染物限值30μgL〜(-1)。在矿山废物固体中检测到较高的U(6,614 mg kg〜(-1)),V(15,814 mg kg〜(-1))和As(40 mg kg〜(-1))浓度。光谱(XPS和XANES)固相分析鉴定出U(Ⅵ),As(-Ⅰ和Ⅲ)和Fe(Ⅱ,Ⅲ)。在264 h后,使矿山废固体与10 mM抗坏血酸(〜pH 3.8)反应时,批处理实验观察到U vs V和As vs Fe的释放呈线性关系。与10 mM碳酸氢盐(〜pH 8.3)反应后,U,V,As和Fe的释放至少低4倍。这些结果表明,类似于火山灰[K_2(UO_2)_2V_2O_8]和含As-Fe的U-V矿物相控制了这些废弃矿山废物中U和As的可用性。由于人体暴露途径和该地区目前摄入水的牲畜暴露,金属浓度升高令人关注。这项研究有助于了解位于废弃矿山废料场附近的社区中金属的发生和迁移。

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  • 来源
    《Environmental Science & Technology》 |2015年第14期|8506-8514|共9页
  • 作者单位

    Department of Chemistry, MSC03 2060, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    Department of Civil Engineering, MSC01 1070, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    Department of Chemical and Biological Engineering, MSC01 1120, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    Department of Earth and Planetary Sciences, MSC03 2040, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    Department of Earth and Planetary Sciences, MSC03 2040, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    Southwest Research and Information Center, P.O. Box 4524, Albuquerque, New Mexico 87196, United States;

    Southwest Research and Information Center, P.O. Box 4524, Albuquerque, New Mexico 87196, United States;

    Tachee Uranium Concerns Committee, Blue Gap, Arizona 86520, United States;

    Tachee Uranium Concerns Committee, Blue Gap, Arizona 86520, United States;

    Community Environmental Health Program, MSC09 5360, University of New Mexico, Albuquerque, New Mexico 87131, United States;

    CentraI New Mexico Community College, Albuquerque, New Mexico 87106, United States;

    Department of Environmental Earth System Science, Stanford University, Stanford, California 94305, United States;

    Department of Civil Engineering, MSC01 1070, University of New Mexico, Albuquerque, New Mexico 87131, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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