Magnetite as a precursor for green rust through the hydrogenotrophic activity of the iron-reducing bacteriaShewanella putrefaciens

Autor: Frédéric Jorand, Marjorie Etique, Christian Ruby
Přispěvatelé: Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)
Rok vydání: 2015
Předmět:
Bioreduction
Fe(II) oxidation
Iron
Inorganic chemistry
Electron donor
Shewanella putrefaciens
010501 environmental sciences
engineering.material
010502 geochemistry & geophysics
Ferric Compounds
01 natural sciences
Transformation
chemistry.chemical_compound
Ferrihydrite
Siderite
Nitrate reduction
Iron bacteria
Lepidocrocite gamma-feooh
[CHIM]Chemical Sciences
Lepidocrocite
Mineral formation
Ecology
Evolution
Behavior and Systematics
0105 earth and related environmental sciences
General Environmental Science
Magnetite
biology
Chemistry
Metallurgy
Microbial reduction
Hematite
biology.organism_classification
Ferrosoferric Oxide
Hydroxy-carbonate
13. Climate action
visual_art
engineering
visual_art.visual_art_medium
General Earth and Planetary Sciences
Organic-matter
Oxidation-Reduction
Biogenic magnetite
Zdroj: Geobiology
Geobiology, Wiley, 2016, 14 (3), pp.237-254. ⟨10.1111/gbi.12170⟩
ISSN: 1472-4677
1472-4669
DOI: 10.1111/gbi.12170
Popis: International audience; Magnetite ((FeFe2O4)-Fe-II-O-III) is often considered as a stable end product of the bioreduction of Fe-III minerals (e.g., ferrihydrite, lepidocrocite, hematite) or of the biological oxidation of Fe-II compounds (e.g., siderite), with green rust (GR) as a mixed Fe-II-Fe-III hydroxide intermediate. Until now, the biotic transformation of magnetite to GR has not been evidenced. In this study, we investigated the capability of an iron-reducing bacterium, Shewanella putrefaciens, to reduce magnetite at circumneutral pH in the presence of dihydrogen as sole inorganic electron donor. During incubation, GR and/or siderite ((FeCO3)-C-II) formation occurred as secondary iron minerals, resulting from the precipitation of Fe-II species produced via the bacterial reduction of Fe-III species present in magnetite. Taking into account the exact nature of the secondary iron minerals and the electron donor source is necessary to understand the exergonic character of the biotic transformation of magnetite to GR, which had been considered to date as thermodynamically unfavorable at circumneutral pH. This finding reinforces the hypothesis that GR would be the cornerstone of the microbial transformations of iron-bearing minerals in the anoxic biogeochemical cycle of iron and opens up new possibilities for the interpretation of the evolution of Earth's history and for the understanding of biocorrosion processes in the field of applied science.
Databáze: OpenAIRE
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