Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.

S. Bonneville, T. Behrends, P. van Cappellen, C. Hyacinthe, W.F.M. Roling

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    Abstract

    A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M
    Original languageEnglish
    Pages (from-to)5842-5854
    Number of pages13
    JournalGeochimica et Cosmochimica Acta
    Volume70
    DOIs
    Publication statusPublished - 2006

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