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Applied and Environmental Microbiology, September 1999, p. 4252-4254, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Role of Humic-Bound Iron as an Electron Transfer Agent in Dissimilatory Fe(III) Reduction

Derek R. Lovley* and Elizabeth L. Blunt-Harris

Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01337

Received 9 March 1999/Accepted 15 June 1999

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.

* Corresponding author. Mailing address: Department of Microbiology, University of Massachusetts, Amherst, MA 01337. Phone: (413) 545-9651. Fax: (413) 545-1578. E-mail: dlovley{at}microbio.umass.edu.

Applied and Environmental Microbiology, September 1999, p. 4252-4254, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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