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Electron Donor Utilization and Secondary Mineral Formation during the Bioreduction of Lepidocrocite by Shewanella putrefaciens CN32

1
Biosciences Division, Argonne National Laboratory, Lemont, IL 60439-4843, USA
2
Department of Civil and Environmental Engineering, University of Iowa, Iowa City, IA 52242-1527, USA
3
Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802-7304, USA
4
California Department of Water Resources, 3500 Industrial Blvd, West Sacramento, CA 96691, USA
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(7), 434; https://doi.org/10.3390/min9070434
Received: 30 April 2019 / Revised: 12 June 2019 / Accepted: 4 July 2019 / Published: 14 July 2019
(This article belongs to the Special Issue Bio-Transformation and Mineralization Induced by Microorganisms)
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Abstract

The bioreduction of Fe(III) oxides by dissimilatory iron reducing bacteria (DIRB) may result in the production of a suite of Fe(II)-bearing secondary minerals, including magnetite, siderite, vivianite, green rusts, and chukanovite; the formation of specific phases controlled by the interaction of various physiological and geochemical factors. In an effort to better understand the effects of individual electron donors on the formation of specific Fe(II)-bearing secondary minerals, we examined the effects of a series of potential electron donors on the bioreduction of lepidocrocite (γ-FeOOH) by Shewanella putrefaciens CN32. Biomineralization products were identified by X-ray diffraction, Mössbauer spectroscopy, and scanning electron microscopy. Acetate, citrate, ethanol, glucose, glutamate, glycerol, malate, and succinate were not effectively utilized for the bioreduction of lepidocrocite by S. putrefaciens CN32; however, substantial Fe(II) production was observed when formate, lactate, H2, pyruvate, serine, or N acetylglucosamine (NAG) was provided as an electron donor. Carbonate or sulfate green rust was the dominant Fe(II)-bearing secondary mineral when formate, H2, lactate, or NAG was provided, however, siderite formed with pyruvate or serine. Geochemical modeling indicated that pH and carbonate concentration are the key factors determining the prevalence of carbonate green rust verses siderite. View Full-Text
Keywords: green rust; siderite; dissimilatory iron reduction; iron oxide green rust; siderite; dissimilatory iron reduction; iron oxide
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O’Loughlin, E.J.; Gorski, C.A.; Flynn, T.M.; Scherer, M.M. Electron Donor Utilization and Secondary Mineral Formation during the Bioreduction of Lepidocrocite by Shewanella putrefaciens CN32. Minerals 2019, 9, 434.

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