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Geochemical Control on Uranium(Ⅳ) Mobility in a Mining-Impacted Wetland

机译：采矿接触湿地中铀（Ⅳ）迁移的地球化学控制

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摘要

Wetlands often act as sinks for uranium and other trace elements. Our previous work at a mining-impacted wetland in France showed that a labile noncrystalline U(Ⅳ) species consisting of U(Ⅳ) bound to Al-P-Fe-Si aggregates was predominant in the soil at locations exhibiting a U- containing clay-rich layer within the top 30 cm. Additionally, in the porewater, the association of U(Ⅳ) with Fe(Ⅱ) and organic matter colloids significantly increased U(Ⅳ) mobility in the wetland. In the present study, within the same wetland, we further demonstrate that the speciation of U at a location not impacted by the clay-rich layer is a different noncrystalline U(Ⅳ) species, consisting of U(Ⅳ) bound to organic matter in soil. We also show that the day-poor location includes an abundant sulfate supply and active microbial sulfate reduction that induce substantial pyrite (FeS_2) predpitation. As a result, Fe(Ⅱ) concentrations in the porewater are much lower than those at day-impacted zones. U porewater concentrations (0.02-0.26 μM) are also considerably lower than those at the day-impacted locations (0.21-3.4 μM) resulting in minimal U mobility. In both cases, soil-associated U represents more than 99% of U in the wetland. We condude that the low U mobility reported at day-poor locations is due to the limited assodation of Fe(Ⅱ) with organic matter colloids in porewater and/or higher stability of the noncrystalline U(Ⅳ) spedes in soil at those locations.
机译：湿地经常充当铀和其他微量元素的汇。我们之前在法国的一个受采矿影响的湿地中的研究表明，不稳定的U（Ⅳ）非晶态物种由结合了Al-P-Fe-Si聚集体的U（Ⅳ）组成，主要表现在土壤中含U的粘土-顶部30厘米内的丰富层。此外，在孔隙水中，U（Ⅳ）与Fe（Ⅱ）和有机物胶体的结合显着增加了湿地中U（Ⅳ）的迁移率。在本研究中，在同一湿地中，我们进一步证明不受富粘土层影响的U的形态是不同的非晶U（Ⅳ）物种，由结合到有机质中的U（Ⅳ）组成。泥。我们还显示，日间贫瘠的地区包括大量的硫酸盐供应和活跃的微生物硫酸盐还原，这些还原导致大量的黄铁矿（FeS_2）沉淀。结果，孔隙水中的Fe（Ⅱ）浓度远低于日间影响区。 U孔隙水的浓度（0.02-0.26μM）也大大低于受日间影响的位置（0.21-3.4μM），从而导致U迁移率最小。在这两种情况下，与土壤相关的U占湿地中U的99％以上。我们认为，在较差的地点报告的U迁移率较低是由于Fe（Ⅱ）与有机物胶体在孔隙水中的沉积作用有限和/或这些位置的土壤中非结晶U（Ⅳ）种子的稳定性较高。

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  • 来源
    《Environmental Science & Technology》 |2014年第17期|10062-10070|共9页
  • 作者

    Yuheng Wang; Alexandre Bagnoud; Elena Suvorova; Eric McGivney; Lydie Chesaux; Vannapha Phrommavanh; Michael Descostes; Rizlan Bernier-Latmani;

  • 作者单位

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

    AREVA - Business Group Mines, R&D Department, BAL 0414C-2, Tour AREVA, 1, place Jean Millier, 92084 Paris La Defense Cedex, France;

    AREVA - Business Group Mines, R&D Department, BAL 0414C-2, Tour AREVA, 1, place Jean Millier, 92084 Paris La Defense Cedex, France;

    Ecole Polytechnique Federale de Lausanne (EPFL) - Environmental Microbiology Laboratory (EML) EPFL-ENAC-IIE-EML, Station 6, CH-1015 Lausanne, Switzerland;

  • 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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