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Modeling iron binding to organic matter

Weber, Tiphaine; Allard, TThierry; Tipping, Edward; Benedetti, Marc F.. 2006 Modeling iron binding to organic matter. Environmental Science & Technology, 40. 7488-7493. 10.1021/es0607077

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Abstract/Summary

The aim of the present work is to model iron speciation during its interaction with natural organic matter. Experimental data for iron speciation were achieved with an insolubilised humic acid used as an organic matter analogue for 30 M to 1.8 mM total iron concentrations and 2 pH 5.5. IHA was found to be able to impose its redox potential to the solution and therefore the Fe(II)/Fe(III) ratio. Model VI and the NICA-Donnan model have been adjusted to experimental results of acid-base titrations, total iron measurements, and redox speciation in solution. They both describe well pH and concentration dependence of iron adsorption. For high iron concentration, Fe(III) solution activity is limited by precipitation of a poorly ordered Fe oxyhydroxide with a higher solubility (log Ks = 5.6-5.7) than ferryhydrite described in the litterature.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1021/es0607077
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: _ Environmental Chemistry & Pollution
ISSN: 0013-936X
NORA Subject Terms: Ecology and Environment
Chemistry
Date made live: 15 May 2008 09:07
URI: http://nora.nerc.ac.uk/id/eprint/2940

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