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Reactivity of As and U co-occurring in Mine Wastes in northeastern Arizona

机译：亚利桑那东北部矿山废物中同时存在的砷和铀的反应性

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The reactivity of co-occurring arsenic (As) and uranium (U) in mine wastes was investigated using batch reactors, microscopy, spectroscopy, and aqueous chemistry. Analyses of field samples collected in proximity to mine wastes in northeastern Arizona confirm the presence of As and U in soils and surrounding waters, as reported in a previous study from our research group. In this study, we measured As (< 0.500 to 7.77 μg/L) and U (0.950 to 165 μg/L) in waters, as well as mine wastes (< 20.0 to 40.0 mg/kg As and < 60.0 to 110 mg/kg U) and background solids (< 20.0 mg/kg As and < 60.0 mg/kg U). Analysis with X-ray fluorescence (XRF) and electron microprobe show the co-occurrence of As and U with iron (Fe) and vanadium (V). These field conditions served as a foundation for additional laboratory experiments to assess the reactivity of metals in these mine wastes. Results from laboratory experiments indicate that labile and exchangeable As(V) was released to solution when solids were sequentially reacted with water and magnesium chloride (MgCl2), while limited U was released to solution with the same reactants. The predominance of As(V) in mine waste solids was confirmed by X-ray absorption near edge (XANES) analysis. Both As and U were released to solution after reaction of solids in batch experiments with HCO3−. Both X-ray photoelectron spectroscopy (XPS) and XANES analysis determined the predominance of Fe(III) in the solids. Mössbauer spectroscopy detected the presence of nano-crystalline goethite, Fe(II) and Fe(III) in (phyllo)silicates, and an unidentified mineral with parameters consistent with arsenopyrite or jarosite in the mine waste solids. Our results suggest that As and U can be released under environmentally relevant conditions in mine waste, which is applicable to risk and exposure assessment.
机译：使用间歇反应器，显微镜，光谱学和水性化学研究了矿山废料中同时存在的砷（As）和铀（U）的反应性。根据我们研究小组先前的研究报告，对亚利桑那州东北部靠近矿山废物的现场样品进行的分析证实了土壤和周围水域中存在砷和铀。在这项研究中，我们测量了水中的As（<0.500至7.77μg/ L）和U（0.950至165μg/ L），以及矿山废物（<20.0至40.0 mg / kg As和<60.0至110 mg / L kg U）和背景固体（<20.0 mg / kg As和<60.0 mg / kg U）。 X射线荧光（XRF）和电子探针分析表明，As和U与铁（Fe）和钒（V）共存。这些田间条件为评估这些矿山废料中金属的反应性的其他实验室实验奠定了基础。实验室实验的结果表明，当固体依次与水和氯化镁（MgCl2）反应时，不稳定和可交换的As（V）释放到溶液中，而有限的U与相同的反应物释放到溶液中。 X射线吸收近边缘（XANES）分析证实了矿渣固体中砷（V）的优势。在与HCO3 -进行批处理实验中，固体反应后，As和U均释放到溶液中。 X射线光电子能谱（XPS）和XANES分析都确定了固体中Fe（III）的优势。 Mössbauer光谱仪检测到（叶状）硅酸盐中存在纳米晶状针铁矿，Fe（II）和Fe（III）以及参数与矿山废料中毒砂或黄钾铁矿一致的身份不明的矿物。我们的结果表明，砷和铀可以在与环境有关的条件下释放到矿山废物中，这适用于风险和暴露评估。

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