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J Hazard Mater. 2010 Mar 15;175(1-3):1062-7. doi: 10.1016/j.jhazmat.2009.10.119. Epub 2009 Nov 10.

Formation of Fe-sulfides in cultures of sulfate-reducing bacteria.

Author information

1
Department of Microbiology, Ohio State University, 484 W. 12th Avenue, Columbus, OH 43210, USA.

Abstract

The purpose of this study was to synthesize Fe-sulfides produced with sulfate-reducing bacteria under experimental laboratory conditions. Fe-sulfides were precipitated with biologically produced sulfide in cultures growing at 22, 45, and 60 degrees C for up to 16 weeks. Abiotic controls were prepared by reacting liquid media with Na(2)S solutions. Precipitates were collected anaerobically, freeze-dried and analyzed by X-ray diffraction. Additional analyses included total Fe and S content, magnetic susceptibility, specific surface area, and scanning electron microscopy. Mackinawite (FeS) and greigite (Fe(3)S(4)) were the dominant iron sulfide phases formed in sulfate-reducing bacterial cultures. An increase in the incubation temperature from 22 to 60 degrees C enhanced the crystallinity of the Fe-sulfides. Generally, greigite was more prevalent in abiotic samples and mackinawite in biogenic materials. Pyrite (FeS(2)) was also found in abiotic precipitates. Abiotic samples had a higher magnetic susceptibility because of the greigite and displayed improved crystallinity compared to biotic materials.

PMID:
19962824
DOI:
10.1016/j.jhazmat.2009.10.119
[Indexed for MEDLINE]

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