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Article: Reduction of iron oxides enhanced by a sulfate-reducing bacterium and biogenic H2S

TitleReduction of iron oxides enhanced by a sulfate-reducing bacterium and biogenic H2S
Authors
KeywordsEnzymatic iron reduction
Iron oxides
Iron sulfide
Sulfate-reducing bacteria
Issue Date2006
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/01490451.asp
Citation
Geomicrobiology Journal, 2006, v. 23 n. 2, p. 103-117 How to Cite?
AbstractInteractions between bacteria and minerals at low temperatures often lead to accelerated alteration and transformation of mineral phases through dissolution and precipitation. Here we report the reductive dissolution of ferrihydrite, goethite, hematite, and magnetite by the sulfate-reducing bacterium Desulfovibrio desulfuricans strain G-20. The goal of this study was: (1) To investigate iron reduction by G-20 using iron as the sole electron acceptor and (2) to determine whether iron reduction could be enhanced during bacterial sulfate reduction. In the absence of sulfate, G-20 was capable of enzymatically reducing structural Fe3+ from different iron-oxide phases including ferrihydrite (4.6% of total iron reduced), goethite (5.3%), hematite (3.7%), magnetite (8.8%) and ferric citrate (23.0%). Enzymatic reduction of goethite and hematite was comparable to abiotic reduction by N2S using the same medium. Within 3 weeks, the maximum cells-density increased 13-fold in the magnetite culture and 5-fold in the ferric-citrate culture compared to cell densities at the beginning. In the presence of sulfate, iron reduction was significantly enhanced in all bacterial cultures. The amount of reduced iron was 64.3% of total iron for hematite, 73.9% for goethite, 97.3% for magnetite, and nearly 100% for ferric citrate and ferrihydrite after incubation for 156 hours. The accelerated dissolution of the iron oxides under sulfate-reducing conditions was due to strong interplay between cell growth and redox-reactions between ferric iron and biogenic sulfides. Analysis by transmission electron microscopy and electron-dispersion spectroscopy indicated extensive alteration of the crystals of goethite, hematite, and magnetite, and revealed changes in stoichiometry of iron sulfides after 1 year's incubation. Copyright © Taylor & Francis Group, LLC.
Persistent Identifierhttp://hdl.handle.net/10722/91301
ISSN
2015 Impact Factor: 1.402
2015 SCImago Journal Rankings: 0.589
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, YLen_HK
dc.contributor.authorVali, Hen_HK
dc.contributor.authorYang, Jen_HK
dc.contributor.authorPhelps, TJen_HK
dc.contributor.authorZhang, CLen_HK
dc.date.accessioned2010-09-17T10:16:36Z-
dc.date.available2010-09-17T10:16:36Z-
dc.date.issued2006en_HK
dc.identifier.citationGeomicrobiology Journal, 2006, v. 23 n. 2, p. 103-117en_HK
dc.identifier.issn0149-0451en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91301-
dc.description.abstractInteractions between bacteria and minerals at low temperatures often lead to accelerated alteration and transformation of mineral phases through dissolution and precipitation. Here we report the reductive dissolution of ferrihydrite, goethite, hematite, and magnetite by the sulfate-reducing bacterium Desulfovibrio desulfuricans strain G-20. The goal of this study was: (1) To investigate iron reduction by G-20 using iron as the sole electron acceptor and (2) to determine whether iron reduction could be enhanced during bacterial sulfate reduction. In the absence of sulfate, G-20 was capable of enzymatically reducing structural Fe3+ from different iron-oxide phases including ferrihydrite (4.6% of total iron reduced), goethite (5.3%), hematite (3.7%), magnetite (8.8%) and ferric citrate (23.0%). Enzymatic reduction of goethite and hematite was comparable to abiotic reduction by N2S using the same medium. Within 3 weeks, the maximum cells-density increased 13-fold in the magnetite culture and 5-fold in the ferric-citrate culture compared to cell densities at the beginning. In the presence of sulfate, iron reduction was significantly enhanced in all bacterial cultures. The amount of reduced iron was 64.3% of total iron for hematite, 73.9% for goethite, 97.3% for magnetite, and nearly 100% for ferric citrate and ferrihydrite after incubation for 156 hours. The accelerated dissolution of the iron oxides under sulfate-reducing conditions was due to strong interplay between cell growth and redox-reactions between ferric iron and biogenic sulfides. Analysis by transmission electron microscopy and electron-dispersion spectroscopy indicated extensive alteration of the crystals of goethite, hematite, and magnetite, and revealed changes in stoichiometry of iron sulfides after 1 year's incubation. Copyright © Taylor & Francis Group, LLC.en_HK
dc.languageengen_HK
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/01490451.aspen_HK
dc.relation.ispartofGeomicrobiology Journalen_HK
dc.subjectEnzymatic iron reductionen_HK
dc.subjectIron oxidesen_HK
dc.subjectIron sulfideen_HK
dc.subjectSulfate-reducing bacteriaen_HK
dc.titleReduction of iron oxides enhanced by a sulfate-reducing bacterium and biogenic H2Sen_HK
dc.typeArticleen_HK
dc.identifier.emailLi, YL:yiliang@hkucc.hku.hken_HK
dc.identifier.authorityLi, YL=rp01354en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/01490450500533965en_HK
dc.identifier.scopuseid_2-s2.0-33644808434en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33644808434&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume23en_HK
dc.identifier.issue2en_HK
dc.identifier.spage103en_HK
dc.identifier.epage117en_HK
dc.identifier.eissn1521-0529-
dc.identifier.isiWOS:000235709900004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, YL=27171876700en_HK
dc.identifier.scopusauthoridVali, H=7004175757en_HK
dc.identifier.scopusauthoridYang, J=15039112900en_HK
dc.identifier.scopusauthoridPhelps, TJ=35509444300en_HK
dc.identifier.scopusauthoridZhang, CL=7405489900en_HK
dc.identifier.citeulike527116-

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