Reduction of ferric green rust by Shewanella putrefaciens.
OBJECTIVE
To reduce carbonated ferric green rust (GR*) using an iron respiring bacterium and obtain its reduced homologue, the mixed Fe(II)-Fe(III) carbonated green rust (GR).


RESULTS
The GR* was chemically synthesized by oxidation of the GR and was incubated with Shewanella putrefaciens cells at a defined [Fe(III)]/[cell] ratio. Sodium methanoate served as the sole electron donor. The GR* was quickly transformed in GR (iron reducing rate = 8.7 mmol l(-1) h(-1)).


CONCLUSIONS
Ferric green rust is available for S. putrefaciens respiration as an electron acceptor. The reversibility of the GR redox state can be driven by bacterial activity.


CONCLUSIONS
This work suggests that GRs would act as an electronic balance in presence of bacteria. It provides also new perspectives for using iron reducing bacterial activity to regenerate the reactive form of GR during soil or water decontamination processes.
Jorand
F
F
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), UMR 7564 CNRS-UHP, 405 rue de Vandoeuvre, Villers-lès-Nancy, France. jorand@pharma.uhp-nancy.fr
Zegeye
A
A
Landry
F
F
Ruby
C
C
D005290:Ferric Compounds / Q000378:metabolism*; D008903:Minerals / Q000378:metabolism; D010084:Oxidation-Reduction; D020614:Shewanella putrefaciens / Q000378:metabolism*
D005290:Ferric Compounds; D008903:Minerals