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首页> 外文期刊>Environmental Science & Technology >Uranium Isotopic Fractionation Induced by U(Ⅵ) Adsorption onto Common Aquifer Minerals
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Uranium Isotopic Fractionation Induced by U(Ⅵ) Adsorption onto Common Aquifer Minerals

机译：普通含水层矿物吸附U（Ⅵ）引起的铀同位素分馏

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摘要

Uranium groundwater contamination due to U mining and processing affects numerous sites globally. Bioreduction of soluble, mobile U(Ⅵ) to U(Ⅳ)-bearing solids is potentially a very effective remediation strategy. Uranium isotopes (~(238)U/~(235)U) have been utilized to track the progress of microbial reduction, with laboratory and field studies finding a ~1‰ isotopic fractionation, with the U(Ⅳ) product enriched in ~(238)U. However, the isotopic fractionation produced by adsorption may complicate the use of ~(238)U/~(235)U to trace microbial reduction. A previous study found that adsorption of U(Ⅵ) onto Mn oxides produced a -0.2‰ fractionation with the adsorbed U(Ⅵ) depleted in ~(238)U. In this study, adsorption to quartz, goethite, birnessite, illite, and aquifer sediments induced an average isotopic fractionation of - 0.15‰ with the adsorbed U(Ⅵ) isotopically lighter than coexisting aqueous U(Ⅵ). In bicarbonate-bearing matrices, the fractionation depended little on the nature of the sorbent, with only birnessite producing an atypically large fractionation. In the case of solutions with ionic strengths much lower than those of typical groundwater, less isotopic fractionation was produced than U(Ⅵ) solutions with greater ionic strength. Studies using U isotope data to assess U(Ⅵ) reduction must consider adsorption as a lesser, but significant isotope fractionation process.
机译：由于铀的开采和加工造成的铀地下水污染影响了全球众多场所。可溶性，可移动的U（Ⅵ）到含U（Ⅳ）的固体的生物还原可能是一种非常有效的修复策略。铀同位素（〜（238）U /〜（235）U）已用于跟踪微生物还原的进展，实验室和现场研究发现〜1‰的同位素分馏，而U（Ⅳ）产品富含〜（ 238）但是，吸附产生的同位素分馏可能会使〜（238）U /〜（235）U的使用复杂化，以追踪微生物的还原过程。先前的研究发现，U（Ⅵ）在Mn氧化物上的吸附会产生-0.2‰的分馏，而所吸附的U（Ⅵ）则消耗〜（238）U。在这项研究中，对石英，针铁矿，水钠锰矿，伊利石和含水层沉积物的吸附引起的同位素平均分馏为-0.15‰，被吸附的U（Ⅵ）的同位素轻于共存的含水U（Ⅵ）。在含碳酸氢盐的基质中，分馏几乎不依赖于吸附剂的性质，只有水钠锰矿会产生非典型的分馏。对于离子强度远低于典型地下水的溶液，其同位素分馏比离子强度更高的U（Ⅵ）溶液少。使用U同位素数据评估U（Ⅵ）还原的研究必须考虑吸附是一种较小但重要的同位素分馏过程。

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  • 来源
    《Environmental Science & Technology》 |2016年第22期|12232-12240|共9页
  • 作者

    N. E. Jemison; T. M. Johnson; A. E. Shiel; C. C. Lundstrom;

  • 作者单位

    Department of Geology, University of Illinois at Urbana-Champaign, 156 Computing Applications Building, 605 E. Springfield Avenue, Champaign, Illinois 61820, United States;

    Department of Geology, University of Illinois at Urbana-Champaign, 156 Computing Applications Building, 605 E. Springfield Avenue, Champaign, Illinois 61820, United States;

    College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, 101 26th Street, Corvallis, Oregon 97322, United States;

    Department of Geology, University of Illinois at Urbana-Champaign, 156 Computing Applications Building, 605 E. Springfield Avenue, Champaign, Illinois 61820, 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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