Formation of Hydroxysulphate Green Rust 2 as a Single Iron(II-III) Mineral in Microbial Culture. - Archive ouverte HAL Access content directly
Journal Articles Geomicrobiology Journal Year : 2005

Formation of Hydroxysulphate Green Rust 2 as a Single Iron(II-III) Mineral in Microbial Culture.

(1) , (2) , (1) , (1) , (1) , (1)
1
2

Abstract

Although GR2(SO 4 2- ) can be easily formed by abiotic synthesis, the biotic formation of hydroxysulphate as a single iron(II-III) mineral in microbial culture and its characterization was not achieved. This study was carried out to investigate the sole formation of GR2(SO 4 2- ) during the reduction of gamma-FeOOH by a dissimilatory iron-respiring bacterium, Shewanella putrefaciens CIP 8040 T . Reduction experiments were performed in a non-buffered medium devoid of organic compounds, with 25 mM of sulphate and with a range of lepidocrocite concentrations with H 2 as the electron donor under nongrowth conditions. The resulting biogenic solids, after iron-respiring activity, were characterized by X-ray diffraction (XRD), transmission Mössbauer spectroscopy (TMS) and electron microscopy (SEM and TEM). The sulphate has been identified as the intercalated anion by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In addition, the structure of this sulphate anion was discussed. Our experimental study demonstrated that, under H 2 atmosphere, the biogenic solid was a GR2(SO 4 2- ), as the sole iron(II-III) bearing mineral, whatever the initial lepidocrocite concentration. The crystals of the biotically formed GR2(SO 4 2- ) are significantly larger than those observed for GR2(SO 4 2- ) obtained through abiotic preparation.
Not file

Dates and versions

hal-00021559 , version 1 (22-03-2006)

Identifiers

Cite

Asfaw Zegeye, Georges Ona-Nguema, Cédric Carteret, Lucie Huguet, Mustapha Abdelmoula, et al.. Formation of Hydroxysulphate Green Rust 2 as a Single Iron(II-III) Mineral in Microbial Culture.. Geomicrobiology Journal, 2005, 22 (7-8), pp.389-399. ⟨10.1080/01490450500248960⟩. ⟨hal-00021559⟩
116 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More