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首页> 外文期刊>The American mineralogist >Biomineralization associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals
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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还原或氧化铁获得能量，并在铁的地球化学循环中起重要作用。进行这项研究以研究与固体矿物质中微生物还原Fe3 +和氧化Fe2 +有关的矿物转化。收集了中国大陆科学钻探项目2450 m深度的流体样品，并还原了还原Fe3 +和氧化Fe2 +的微生物。富集培养物显示了还原脱铝石和柠檬酸铁中Fe3 +的还原，以及在堇青石，菱铁矿和一硫化物（FeS）中Fe2 +的氧化。其他实验证明铁的还原和氧化是生物的。 FeS的氧化导致生成针铁矿，纤铁矿和水铁矿。尽管我们的分子微生物学分析检测到乙醇嗜热厌氧菌为富集培养中的主要生物，但Fe3 +的还原和Fe2 +的氧化可能是由生物体联合体完成的。我们的结果对于自然环境中固体矿物质中铁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无机和有机污染物的迁移率和溶解度有关。

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