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首页> 外文期刊>Environmental Science & Technology >Competitive Reduction of Pertechnetate (~(99)TcO_4~-) by Dissimilatory Metal Reducing Bacteria and Biogenic Fe(ll)
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Competitive Reduction of Pertechnetate (~(99)TcO_4~-) by Dissimilatory Metal Reducing Bacteria and Biogenic Fe(ll)

机译：通过异化金属还原细菌和生物Fe（II）竞争性降低高tech酸盐（〜（99）TcO_4〜-）

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摘要

The fate of pertechnetate (~(99)Tc(Ⅶ)O_4~-) during bioreduction was investigated in the presence of 2-line ferrihydrite (Fh) and various dissimilatory metal reducing bacteria (DMRB) {Geobacter, Anaewmyxobacter, Shewanella) in comparison with TcO_4~- bioreduction in the absence of Fh. In the presence of Fh, Tc was present primarily as a fine-grained Tc(Ⅳ)/Fe precipitate that was distinct from the Tc(IV)O_2-nH_2O solids produced by direct biological Tc(VII) reduction. Aqueous Tc concentrations (<0.2 μm) in the bioreduced Fh suspensions (1.7 to 3.2 x 10~(-9) mol L~(-1)) were over 1 order of magnitude lower than when TcO_4~- was biologically reduced in the absence of Fh (4.0 × 10~(-8) to 1.0 × 10~(-7) mol L~(-1)). EXAFS analyses of the bioreduced Fh-Tc products were consistent with variable chain length Tc-0 octahedra bonded to Fe-0 octahedra associated with the surface of the residual or secondary Fe(lll) oxide. In contrast biogenic TcO_2·nH_2O had significantly more Tc-Tc second neighbors and a distinct long-range order consistent with small particle polymers of TcO_2. In Fe-rich subsurface sediments, the reduction of Tc(Ⅶ) by Fe(II) may predominate over direct microbial pathways, potentially leading to lower concentrations of aqueous ~(99)Tc(Ⅳ).
机译：比较了在存在2线亚铁水合物（Fh）和各种异化金属还原细菌（DMRB）（土壤杆菌，厌氧粘杆菌，希瓦氏菌）的情况下生物还原过程中高T酸酯（〜（99）Tc（））O_4〜-）的命运。在没有Fh的情况下具有TcO_4〜-生物还原作用。在Fh存在下，Tc主要以细粒Tc（Ⅳ）/ Fe沉淀形式存在，这与通过直接生物Tc（VII）还原产生的Tc（IV）O_2-nH_2O固体不同。生物还原的Fh悬浮液（1.7至3.2 x 10〜（-9）mol L〜（-1））中的Tc水溶液浓度（<0.2μm）比在不存在TcO_4〜-的情况下被生物还原时降低了1个数量级以上Fh（4.0×10〜（-8）至1.0×10〜（-7）mol L〜（-1））。生物还原的Fh-Tc产物的EXAFS分析与链长Tc-0八面体结合到Fe-0八面体上，该残基与残留的或次生的Fe（III）氧化物表面相一致。相反，生物成因的TcO_2·nH_2O具有更多的Tc-Tc第二邻居，并且具有明显的远距离顺序，与TcO_2的小颗粒聚合物一致。在富铁的地下沉积物中，铁（II）对Tc（Ⅶ）的还原作用可能超过直接的微生物途径，可能导致〜（99）Tc（Ⅳ）水溶液的浓度降低。

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  • 来源
    《Environmental Science & Technology》 |2011年第3期|p.951-957|共7页
  • 作者

    ANDREW E. PLYMALE; JAMES K. FREDRICKSON; JOHN M. ZACHARA; ALICE C. DOHNALKOVA; STEVE M. HEALD; DEAN A. MOORE; DAVID W. KENNEDY; MATTHEW J. MARSHALL; CHONGMIN WANG; CHARLES T. RESCH; PONNUSAMY NACHIMUTHU;

  • 作者单位

    Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnArgonne National Laboratory, Argonne, Illinois 60439, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, 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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