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首页> 外文期刊>Environmental Science & Technology >Influence of Uranium Concentration and pH on U-Phosphate Biomineralization by Caulobacter OR37
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Influence of Uranium Concentration and pH on U-Phosphate Biomineralization by Caulobacter OR37

机译：铀浓度和pH对U-磷酸盐杆菌的影响

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摘要

Uranium contamination of soils and groundwater in the United States represents a significant health risk and will require multiple remediation approaches. Microbial phosphatase activity coupled to the addition of an organic P source has recently been studied as a remediation strategy that provides an extended release of inorganic P (Pi) into U-contaminated sites, resulting in the precipitation of meta- autunite minerals. Previous laboratory- and field-based biomineralization studies have investigated environments with relatively high U concentrations (＞20 μM). However, most contaminated sites have much lower U concentrations (＜2 μM). The Environmental Protection Agency (EPA) limit for U in drinking water is 0.126 μM. Reaching this regulatory limit becomes challenging as U concentrations approach autunite solubility. We studied the precipitation of U(Ⅵ)-phosphate minerals by an environmental isolate of Caulobacter sp. (strain OR37) from an Oak Ridge, Tennessee, U-contaminated site. Abiotic U(Ⅵ) solubility experiments reveal that U(Ⅵ)-phosphate minerals do not form in the presence of excess Pi (500 μM) when U(Ⅵ) concentrations are ＜1 μM and pH is ＜5. When OR37 cells are reacted under the same conditions with Pi or glycerol-2- phosphate, U(Ⅵ)-phosphate mineral formation was observed, along with the formation of intracellular polyphosphate granules. These results show that bacteria provide supersaturated microenvironments needed for U(Ⅵ)-phosphate mineralization while hydrolyzing organic P sources. This provides a pathway to lower U concentrations to below EPA limits for drinking water.
机译：在美国的土壤和地下水的污染铀代表显著的健康风险并需要多个补救办法。耦合到所述加入有机P源的微生物的磷酸酶活性，最近被研究作为一个补救策略，提供了无机P（PI）的延长释放到U形受污染场地，导致间 - 钙铀云母矿物质的沉淀。以前laboratory-和场基生物矿化研究已经调查环境具有相对高ù浓度（>20μM）。然而，大多数污染场地具有低得多的ù浓度（<2微米）。在饮用水环境保护署（EPA）限制U是0.126微米。要达到这一监管限制成为挑战当U浓度接近钙铀云母的溶解度。我们通过柄杆菌属的环境分离研究U（Ⅵ）磷酸矿物质的沉淀。从田纳西州橡树岭，U-污染场地（菌株OR37）。非生物U（Ⅵ）的溶解性实验显示，U（Ⅵ）磷酸的矿物不超过PI（500μM）当U（Ⅵ）的浓度是<1μM和pH <5的存在下形成。当OR37细胞与PI或甘油-2-磷酸的相同条件下进行反应，观察到U（Ⅵ）磷酸矿物形成，与细胞内多磷酸盐颗粒的形成沿。这些结果表明，细菌提供所需的过饱和Ü微环境（Ⅵ）磷酸矿化而水解有机磷源。这提供了一个通路，以降低û浓度至低于EPA限制了饮用水。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|1626-1636|共11页
  • 作者

    Keith D. Morrison; Mavrik Zavarin; Annie B. Kersting; James D. Begg; Harris E. Mason; Enrica Balboni; Yongqin Jiao;

  • 作者单位

    Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Glenn T. Seaborg Institute Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Director's Office Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Atmospheric Earth and Energy Division Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Biosciences and Biotechnology Division Lawrence Livermore National Laboratory Livermore California 94550 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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