A revised scheme for the reactivity of iron (oxyhydr)oxide minerals towards dissolved sulfide |
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| Authors: | Simon W Poulton Michael D Krom |
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| Institution: | 1 Danish Center for Earth System Science, Institute of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense, Denmark
2 Earth and Biosphere Institute, School of Earth Sciences, University of Leeds, Leeds, LS2 9JT, UK |
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| Abstract: | The reaction between dissolved sulfide and synthetic iron (oxyhydr)oxide minerals was studied in artificial seawater and 0.1 M NaCl at pH 7.5 and 25°C. Electron transfer between surface-complexed sulfide and solid-phase Fe(III) results in the oxidation of dissolved sulfide to elemental sulfur, and the subsequent dissolution of the surface-reduced Fe. Sulfide oxidation and Fe(II) dissolution kinetics were evaluated for freshly precipitated hydrous ferric oxide (HFO), lepidocrocite, goethite, magnetite, hematite, and Al-substituted lepidocrocite. Reaction kinetics were expressed in terms of an empirical rate equation of the form:
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