Aerobic Reduction of Chromium(VI) by Pseudomonas corrugata 28: Influence of Metabolism and Fate of Reduced Chromium

Pseudomonas corrugata 28 represents a microorganism that can potentially be applied for in situ bioremediation of Cr(VI) contaminated sites. This strain combines a high resistance toward toxic Cr(VI) with the ability to reduce Cr(VI) to Cr(III) under oxic conditions. In this study, the aerobic reduc...

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Bibliographic Details
Published in:Geomicrobiology journal 2012-03, Vol.29 (2), p.173-185
Main Authors: Christl, Iso, Imseng, Martin, Tatti, Enrico, Frommer, Jakob, Viti, Carlo, Giovannetti, Luciana, Kretzschmar, Ruben
Format: Article
Language:English
Subjects:
aerobic conditions
hexavalent chromium
microbial reduction
organic metal complexes
Pseudomonas corrugata 28
scanning transmission X-ray microscopy (STXM)
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Summary:Pseudomonas corrugata 28 represents a microorganism that can potentially be applied for in situ bioremediation of Cr(VI) contaminated sites. This strain combines a high resistance toward toxic Cr(VI) with the ability to reduce Cr(VI) to Cr(III) under oxic conditions. In this study, the aerobic reduction of Cr(VI) by Pseudomonas corrugata 28 was examined under different carbon and sulfur supply conditions to assess the influence of microbial carbon and sulfur metabolism on Cr(VI) reduction. The fate of reduced chromium was elucidated by investigating the speciation of chromium in solution as well as the interaction of chromium with bacterial surfaces. Reduction of Cr(VI) was found to be a metabolic process resulting mainly in the formation of dissolved organic Cr(III)-complexes. Small amounts of reduced chromium were weakly associated with bacterial surfaces. The formation of inorganic Cr(III)-precipitates was not indicated.
ISSN:0149-0451
1521-0529
DOI:10.1080/01490451.2010.539662