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A Comparison of the Rates of Fe(III) Reduction in Synthetic and Bacteriogenic Iron Oxides by Shewanella putrefaciens CN32

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The susceptibility of various bacteriogenic iron oxides (BIOS) to bacterial Fe(III) reduction was examined. Reduction resulted in complete dissolution of the iron mineral from the surfaces of the Fe-oxidizing consortium. Reduction rates were compared to that of synthetic ferrihydrite (HFO). The reduction rate of HFO (0.162 day- 1) was significantly lower than that of Aspo (Gallionella dominated) BIOS (0.269 day- 1). Two Canadian (Leptothrix dominated) BIOS samples showed statistically equivalent rates of reduction (0.541 day-1 and 0.467 day- 1), which were higher than both Aspo BIOS and HFO. BIOS produced by different iron-oxidizing genera have different susceptibilities to microbial reduction.
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Keywords: BIOS; Shewanella putrefaciens; ferrihydrite; iron reduction

Document Type: Research Article

Affiliations: 1: Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada 2: Environmental Technologies Branch, Chalk River Laboratories, Atomic Energy of Canada Ltd., Ontario, Canada 3: Department of Geology, Earth Sciences Centre, Toronto, Ontario, Canada

Publication date: 2009-03-01

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