Microbial oxidation of Fe2+ and pyrite exposed to flux of micromolar H2O2 in acidic media

Ma, Yingqun and Lin, Chuxia (2013) Microbial oxidation of Fe2+ and pyrite exposed to flux of micromolar H2O2 in acidic media. Scientific Reports, 3. pp. 1-10.

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Abstract

At an initial pH of 2, while abiotic oxidation of aqueous Fe2+ was enhanced by a flux of H2O2 at micromolar concentrations, bio-oxidation of aqueous Fe2+ could be impeded due to oxidative stress/damage in Acidithiobacillus ferrooxidans caused by Fenton reaction-derived hydroxyl radical, particularly when the molar ratio of Fe 2+ to H2O2 was low. When pyrite cubes were intermittently exposed to fluxes of micromolar H2O2, the reduced Fe2+-Fe 3+ conversion rate in the solution (due to reduced microbial activity) weakened the Fe 3+-catalyzed oxidation of cubic pyrite and added to relative importance of H2O2-driven oxidation in the corrosion of mineral surfaces for the treatments with high H 2O2 doses. This had effects on reducing the build-up of a passivating coating layer on the mineral surfaces. Cell attachment to the mineral surfaces was only observed at the later stage of the experiment after the solutions became less favorable for the growth of planktonic bacteria.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Macmillan Publishers Limited. Article can be copied, distributed, transmitted under the following conditions: - You must attribute the work in the manner specified by the author or licensor - You may not use this work for commercial purposes - You may not alter, transform, or build upon this work. Licence details: http://creativecommons.org/licenses/by-nc-nd/3.0/
Faculty / Department / School: Current - USQ Other
Date Deposited: 10 Jul 2013 23:38
Last Modified: 13 Jan 2014 01:10
Uncontrolled Keywords: geochemistry; pollution; remediation; soil microbiology; spectroscopy
Fields of Research : 04 Earth Sciences > 0402 Geochemistry > 040299 Geochemistry not elsewhere classified
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
05 Environmental Sciences > 0503 Soil Sciences > 050303 Soil Biology
Socio-Economic Objective: D Environment > 96 Environment > 9614 Soils > 961404 Mining Soils
Identification Number or DOI: 10.1038/srep01979
URI: http://eprints.usq.edu.au/id/eprint/23685

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