Microbial reduction of manganese oxides - Interactions with iron and sulfur

Details Microbial reduction of manganese oxides - Interactions with iron and sulfur Microbial reduction of manganese oxides - Interactions with iron and sulfur

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2727m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Nov. 1988, p. 2727-2732.

Computer Science

10

Biochemistry, Iron, Manganese Oxides, Microorganisms, Reduction (Chemistry), Sulfur, Anaerobes, Metabolism, Sulfides

Scientific paper

Alteromonas putrefaciens (strain MR-1) is capable of rapid Mn(IV) reduction under conditions of neutral pH and temperatures characteristic of the Oneida Lake, New York, sediments from which it was isolated. MR-1 also reduces Fe(3+) to Fe(2+), and disproportionates thiosulfate to sulfide and sulfite; independently, the Fe(2+) and sulfide act as rapid reductants of Mn. The addition of Fe(3+) or thiosulfate to cultures of MR-1 in the presence of oxidized Mn increases the rate and the extent of Mn reduction relative to that observed in the absence of Fe(3+) or thiosulfate. Furthermore, when Fe(3+) and Mn oxides are present conjointly, Fe(2+) does not appear until the reduction of the oxidized Mn is complete. These results demonstrate that the observed rates of Fe(2+) and sulfide production may underestimate the total rates of Fe and sulfate reduction in those environments containing oxidized Mn. These results also demonstrate the potential impact that a single microbe can exert on sediment geochemistry, and provide the basis for preliminary models of the complexity of microbial and geochemical interactions that occur.

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