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Biomineralization associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals

机译：生物矿化与固体矿物质中微生物还原Fe3 +和氧化Fe2 +有关

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摘要

Iron-reducing and oxidizing microorganisms gain energy through reduction or oxidation of iron, and by doing so play an important role in the geochemical cycling of iron. This study was undertaken to investigate mineral transformations associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals. A fluid sample from the 2450 m depth of the Chinese Continental Scientific Drill­ing project was collected, and Fe3+-reducing and Fe2+-oxidizing microorganisms were enriched. The enrichment cultures displayed reduction of Fe3+ in nontronite and ferric citrate, and oxidation of Fe2+ in vivianite, siderite, and monosulfide (FeS). Additional experiments verified that the iron reduction and oxidation was biological. Oxidation of FeS resulted in the formation of goethite, lepidocrocite, and ferrihydrite as products. Although our molecular microbiological analyses detected Thermoanaerobacter ethanolicus as a predominant organism in the enrichment culture, Fe3+ reduction and Fe2+ oxidation may be accomplished by a consortia of organisms. Our results have important environmental and ecological implications for iron redox cycling in solid minerals in natural environments, where iron mineral transformations may be related to the mobility and solubility of inorganic and organic contaminants.
机译：还原铁和氧化微生物通过铁的 还原或氧化获得能量，从而在铁的地球化学循环中起重要的作用。 进行了这项研究，以研究与微生物 还原Fe 3 + 和氧化Fe 2 + 相关的矿物转化在固体矿物质中。收集了中国大陆科学钻探项目2450 m深度的流体样品，并进行了Fe 3 + 还原 和Fe 2 + 的微生物。富集 培养物在囊脱石和柠檬酸铁 中减少了Fe 3 + ，并在其中氧化了Fe 2 + 。白铁矿，菱铁矿和一硫化物 （FeS）。其他实验证明铁还原 和氧化是生物的。 FeS的氧化导致形成针铁矿，纤铁矿和水铁矿的 形成。 尽管我们的分子微生物学分析检测到嗜热厌氧菌 乙醇是主要生物。在富集培养中， Fe 3 + 的还原和Fe 2 + 的氧化可以通过生物体的财团 完成。我们的研究结果对自然环境中固体矿物质中铁矿的氧化还原循环具有重要的环境和生态意义，其中铁矿物质的转化可能与迁移率有关 和无机污染物的溶解度和溶解度。

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  • 来源
    《American Mineralogist》 |2009年第7期|1049-1058|共10页
  • 作者

    Gengxin Zhang; Hailiang Dong; Hongchen Jiang; Ravi K. Kukkadapu; Jinwook Kim; Dennis Eberl; Zhiqin Xu;

  • 作者单位

    Department of Geology, Miami University, Oxford, Ohio 45056, U.S.A.;

    Department of Geology, Miami University, Oxford, Ohio 45056, U.S.A.;

    Geomicrobiology Laboratory, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;

    Pacific Northwest National Laboratory, MSIN K8-96, Richland, Washington 99352, U.S.A.;

    Department of Earth System Sciences, Yonsei University, Seoul, Korea;

    U.S. Geological Survey, Boulder, Colorado 80303, U.S.A.;

    Chinese Academy of Geological Sciences, Institute of Geology, Beijing 10037, China;

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