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Published January 2009 | Accepted Version
Journal Article Open

Phototrophic Fe(II) oxidation in an atmosphere of H_2: implications for Archean banded iron formations

Croal, L. R.
Jiao, Y.1 ORCID icon
Kappler, A.2
Newman, D. K.3 ORCID icon
  • 1. ROR icon Lawrence Livermore National Laboratory
  • 2. ROR icon University of Tübingen
  • 3. ROR icon Howard Hughes Medical Institute
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Abstract

The effect of hydrogen on the rate of phototrophic Fe(II) oxidation by two species of purple bacteria was measured at two different bicarbonate concentrations. Hydrogen slowed Fe(II) oxidation to varying degrees depending on the bicarbonate concentration, but even the slowest rate of Fe(II) oxidation remained on the same order of magnitude as that estimated to have been necessary to deposit the Hamersley banded iron formations. Given the hydrogen and bicarbonate concentrations inferred for the Archean, our data suggest that Fe(II) phototrophy could have been a viable process at this time.

Additional Information

© 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd. Received 15 February 2008; accepted 25 November 2008. Article first published online: 19 Dec. 2008. We thank the reviewers for constructive comments and the members of the Newman laboratory for helpful discussion. This work was supported by grants from the Packard Foundation and Howard Hughes Medical Institute to D.K.N. and an NSF graduate fellowship to L.R.C. Authors Croal and Jiao contributed equally to this work.

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