Biotic Fe(III) reduction of magnetite coupled to H2 oxidation: Implication for radioactive waste geological disposal - Archive ouverte HAL Access content directly
Journal Articles Chemical Geology Year : 2015

Biotic Fe(III) reduction of magnetite coupled to H2 oxidation: Implication for radioactive waste geological disposal

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Abstract

We report the first results on microbial Fe (III) reduction of magnetite in the presence of H2 (4 per cent, 10 per cent, or 60 per cent H2) as the sole electron donor. The H2 concentration is the parameter likely to control both chemical and biological dissolution of magnetite, and a direct correlation between H2 concentration, bacterial activity, and the extent of Fe(III) bioreduction was observed. Vivianite was identified as a secondary mineral phase as a consequence of the increase in dissolved Fe(II) and the presence of phosphate in the experimental solutions. In the context of metal corrosion, Fe(III) bioreduction coupled to H2 oxidation may affect the passivating properties of oxide layers made of magnetite.
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cea-02383215 , version 1 (27-11-2019)

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Marta K Schütz, Olivier Bildstein, Michel L Schlegel, Marie Libert. Biotic Fe(III) reduction of magnetite coupled to H2 oxidation: Implication for radioactive waste geological disposal. Chemical Geology, 2015, 419, pp.67-74. ⟨10.1016/j.chemgeo.2015.10.039⟩. ⟨cea-02383215⟩
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