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Effect of the presence of bacterial surfaces during the synthesis of Fe oxides by oxidation of ferrous ions

Xavier Chatellier, Danielle Fortin, Marcia M. West, Gary G. Leppard and F. Grant Ferris
Effect of the presence of bacterial surfaces during the synthesis of Fe oxides by oxidation of ferrous ions (in Biogenic iron minerals, Mihaly Posfai (prefacer))
European Journal of Mineralogy (August 2001) 13 (4): 705-714

Abstract

Natural iron-oxides are often found in close association with bacterial cells in aquatic environments, but the effect of bacteria on their formation is still under investigation. The present study was undertaken to assess the effect of two common bacteria, Bacillus subtilis and Escherichia coli, on the morphology and mineralogy of Fe oxides. All Fe oxides were synthesised by oxidation of Fe(II) (2X10 (super -4) M) at pH = 7. Three systems were studied, i.e., abiotic Fe oxides, Fe oxides formed in the presence of bacteria (which we call "biogenic" Fe oxides) and abiotic Fe oxides mixed with bacterial cells. Samples were analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Fe oxide particles in all systems showed a needle-like morphology, with many needles seeming to be attached to a sheet, and were identified as lepidocrocite. However, the biogenic lepidocrocite crystals were generally shorter than the abiotic ones, and the crystals were found in association with the bacterial cell-wall, especially with B. subtilis, a Gram-positive bacterium. Biogenic lepidocrocite crystals also displayed an attenuation of the XRD 120 line, which is indicative of a low crystallinity. Growth limitation and poor crystalline order are then likely to affect the surface area of Fe oxides and indirectly, their sorptive capacity.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 4
Title: Effect of the presence of bacterial surfaces during the synthesis of Fe oxides by oxidation of ferrous ions
Title: Biogenic iron minerals
Affiliation: University of Ottawa, Department of Earth Sciences, Ottawa, ON, Canada
Affiliation: University of Veszprem, Hungary
Pages: 705-714
Published: 200108
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Biogenic iron minerals symposium and workshop
Meeting location: Tihany, HUN, Hungary
Meeting date: 20000520May 20-23, 2000
References: 29
Accession Number: 2001-065624
Categories: Mineralogy of non-silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: McMaster University, CAN, CanadaNational Water Research Institute, CAN, CanadaUniversity of Toronto, CAN, Canada
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute.
Update Code: 200120
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