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Enzymatic versus nonenzymatic mechanisms for Fe(III) reduction in aquatic sediments

Environmental Science and Technology

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Abstract

The potential for nonenzymatic reduction of Fe(III) either by organic compounds or by the development of a low redox potential during microbial metabolism was compared with direct, enzymatic Fe(III) reduction by Fe(III)-reducing microorganisms. At circumneutral pH, very few organic compounds nonenzymatically reduced Fe(III). In contrast, in the presence of the appropriate Fe(IH)-reducing microorganisms, most of the organic compounds examined could be completely oxidized to carbon dioxide with the reduction of Fe(III). Even for those organic compounds that could nonenzymatically reduce Fe(III), microbial Fe(III) reduction was much more extensive. The development of a low redox potential during microbial fermentation did not result in nonenzymatic Fe(III) reduction. Model organic compounds were readily oxidized in Fe(III)-reducing aquifer sediments, but not in sterilized sediments. These results suggest that microorganisms enzymatically catalyze most of the Fe(III) reduction in the Fe(III) reduction zone of aquatic sediments and aquifers.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Enzymatic versus nonenzymatic mechanisms for Fe(III) reduction in aquatic sediments
Series title:
Environmental Science and Technology
Volume
25
Issue:
6
Year Published:
1991
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1062
Last page:
1067
Number of Pages:
6