Journal
GEOCHIMICA ET COSMOCHIMICA ACTA
Volume 70, Issue 6, Pages 1388-1401Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2005.11.020
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Iron is the most abundant redox-active metallic element on the earth's surface. Quinones, a term that encompasses dihydroxybenzenes (catechol and hydroquinone), semiquinone radicals, and benzoquinones, are abundant moieties within natural organic matter. Separately or in concert, iron species (both dissolved and precipitated) and quinones are believed to be key participants in a wide range of environmental redox reactions. Here, we investigate how pH, quinone structure, and iron speciation impose thermodynamic constraints oil possible reactions. The steps outlined in this work must be followed to evaluate whether postulated redox processes involving iron and quinones are energetically feasible. (c) 2005 Elsevier Inc. All rights reserved.
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