Biotic and Abiotic Reduction of Goethite (α-FeOOH) by Subsurface Microorganisms in the Presence of Electron Donor and Sulfate

Title
Biotic and Abiotic Reduction of Goethite (α-FeOOH) by Subsurface Microorganisms in the Presence of Electron Donor and Sulfate
Authors
권만재양중석심무준이승학Maxim BoyanovKenneth KemnerEdward O'Loughlin
Keywords
Goethite; Acetate; Glucose; Sulfate; Microorganisms
Issue Date
2014-02
Publisher
한국지하수토양환경학회지
Citation
VOL 19, NO 1, 54-62
Abstract
To better understand dissimilatory iron and sulfate reduction (DIR and DSR) by subsurface microorganisms, we investigated the effects of sulfate and electron donors on the microbial goethite (α-FeOOH) reduction. Batch systems were created 1) with acetate or glucose (donor), 2) with goethite and sulfate (acceptor), and 3) with aquifer sediment (microbial source). With 0.2 mM sulfate, goethite reduction coupled with acetate oxidation was limited. However, with 10 mM sulfate, 8 mM goethite reduction occurred with complete sulfate reduction and x-ray absorption fine-structure analysis indicated the formation of iron sulfide. This suggests that goethite reduction was due to the sulfide species produced by DSR bacteria rather than direct microbial reaction by DIR bacteria. Both acetate and glucose promoted goethite reduction. The rate of goethite reduction was faster with glucose, while the extent of goethite reduction was higher with acetate. Sulfate reduction (10 mM) occurred only with acetate. The results suggest that glucose-fermenting bacteria rapidly stimulated goethite reduction, but acetate-oxidizing DSR bacteria reduced goethite indirectly by producing sulfides. This study suggests that the availability of specific electron donor and sulfate significantly influence microbial community activities as well as goethite transformation, which should be considered for the bioremediation of contaminated environments.
URI
http://pubs.kist.re.kr/handle/201004/48076
ISSN
15986438
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KIST Publication > Article
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