Abstract
We report the first results on microbial Fe(III) reduction of magnetite in the presence of H2 (4%, 10%, or 60% 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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