Role of Humic-Bound Iron as an Electron Transfer Agent in Dissimilatory Fe(III) Reduction |
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Authors: | Derek R. Lovley and Elizabeth L. Blunt-Harris |
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Abstract: | The dissimilatory Fe(III) reducer Geobacter metallireducens reduced Fe(III) bound in humic substances, but the concentrations of Fe(III) in a wide range of highly purified humic substances were too low to account for a significant portion of the electron-accepting capacities of the humic substances. Furthermore, once reduced, the iron in humic substances could not transfer electrons to Fe(III) oxide. These results suggest that other electron-accepting moieties in humic substances, such as quinones, are the important electron-accepting and shuttling agents under Fe(III)-reducing conditions. |
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