Role of organic matter in framboidal pyrite oxidation

Rigby, Portia A., Dobos, Steve, Cook, Freeman J., & Goonetilleke, Ashantha (2006) Role of organic matter in framboidal pyrite oxidation. Science of the Total Environment, 367(2-3), pp. 847-854.

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An experimental system has been set up to investigate the reaction kinetics of framboidal pyrite oxidation in real, reactive acid sulfate soil assemblages. This study was undertaken to determine the degree to which pyrite oxidation rates are reduced by bacteriological reactions and organic matter, which both modify the net reaction mechanisms and compete for available oxygen. The results from these experimental runs not only confirm the role of organic matter in mitigating pyrite oxidation, but indicate that, at least initially, the acidity produced is consumed or otherwise ameliorated by parallel reactions. Tracking pH or [H+] in both a reactor and in soil does not accurately reflect reaction progress, and may not correctly indicate the true level of risk. In comparison, the tracking of pyrite oxidation with the concentration of sulfate in solution is not affected by side reactions or precipitation, and is therefore a better indicator for the rate of pyrite destruction.

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17 citations in Scopus
16 citations in Web of Science®
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ID Code: 8629
Item Type: Journal Article
Refereed: Yes
Keywords: acid sulfate soils, framboidal pyrite oxidation, organic matter
DOI: 10.1016/j.scitotenv.2004.10.011
ISSN: 0048-9697
Subjects: Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300) > Soil Chemistry (excl. Carbon Sequestration Science) (050304)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700) > Environmental Engineering not elsewhere classified (090799)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 13 Jul 2007 00:00
Last Modified: 29 Feb 2012 13:30

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