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Transformation of Fe(II)-Fe(III) Hydroxysulphite into Hydroxysulphate Green Rusts

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Abstract

Fe(II)-Fe(III) hydroxysulphite Green Rust 1, GR1(SO3 2−), can be obtained by oxidation of Fe(OH)2 precipitates in aqueous solution and characterised by X-ray diffraction and Mössbauer spectroscopy. In contrast to other Green Rusts (GRs) which then oxidise directly into ferric oxyhydroxides and magnetite, GR1(SO3 2−) first oxidises into a Green Rust two compound, as identified by X-ray diffraction. Mössbauer analysis reveals that this GR2 is the Fe(II)-Fe(III) hydroxysulphate, GR2(SO4 2−). Such an oxidation process, GR1(SO3 2−) → GR2(SO4 2−) confirms that the average oxidation number of Fe increases according to the chemical formulae previously proposed, [FeII 6FeIII 2(OH)16]2+[SO3 · mH2O]2−, and [FeII 4FeIII 2(OH)12]2+[SO4 · nH2O]2− for GR1(SO3 2−) and GR2(SO4 2−) with oxidation numbers of 2.25 and 2.33, respectively. The process implies likely the presence of sulphate ions inherent to the oxidation of sulphite in the solution.

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  1. Laboratoire de Chimie Physique pour l'Environnement, UMR 9992 CNRS - Université Henri Poincaré-Nancy 1., 405 rue de Vandoeuvre, F-54600, Villers-lès-Nancy, France

    L. Simon, Ph. Refait & J.-M.R. Génin

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  1. L. Simon
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  2. Ph. Refait
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  3. J.-M.R. Génin
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Simon, L., Refait, P. & Génin, JM. Transformation of Fe(II)-Fe(III) Hydroxysulphite into Hydroxysulphate Green Rusts. Hyperfine Interactions 112, 217–222 (1998). https://doi.org/10.1023/A:1010845107110

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