Biogenic hydroxysulfate green rust, a potential electron acceptor for SRB activity

Abstract : Microbiological reduction of a biogenic sulfated green rust (GR2(SO42-)), was examined using a sulfate reducing bacterium (Desulfovibrio alaskensis). Experiments investigated whether GR2(SO42-) could serve as a sulfate source for D. alaskensis anaerobic respiration by analyzing mineral transformation. Batch experiments were conducted using lactate as the electron donor and biogenic GR2(SO42-) as the electron acceptor, at circumneutral pH in unbuffered medium. GR2(SO42-) transformation was monitored with time by X-ray diffraction (XRD), Transmission Mössbauer Spectroscopy (TMS), Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). Thus, the results presented in this study indicate that D. alaskensis cells were able to use GR2(SO42-) as an electron acceptor. GR1(CO32-), vivianite and an iron sulfur compound were formed as a result of GR2(SO42-) reduction by D. alaskensis. Hence, in environments where geochemical conditions promote biogenic GR2(SO42-) formation, this mineral could stimulate the anaerobic respiration of sulfate reducing bacteria.
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Contributor : Mustapha Abdelmoula <>
Submitted on : Thursday, September 30, 2010 - 3:18:33 PM
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Asfaw Zegeye, Lucie Huguet, Mustapha Abdelmoula, Cédric Carteret, M. Mullet, et al.. Biogenic hydroxysulfate green rust, a potential electron acceptor for SRB activity. Geochimica et Cosmochimica Acta, Elsevier, 2007, 71 (22), pp.5450-5462. ⟨10.1016/jgca.2007.08.025⟩. ⟨hal-00522385⟩



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