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Iron Oxidation and Precipitation of Ferric Hydroxysulfates by Resting Thiobacillus ferrooxidans Cells by Norman Lazaroff; Warren Sigal; Andrew Wasserman is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The oxidation of ferrous ions, in acid solution, by resting suspensions of __Thiobacillus ferrooxidans__ produced sediments consisting of crystalline jarosites, amorphous ferric hydroxysulfates, or both. These products differed conspicuously in chemical composition and infrared spectra from precipitates formed by abiotic oxidation under similar conditions. The amorphous sediments, produced by bacterial oxidation, exhibited a distinctive fibroporous microstructure when examined by scanning electron microscopy. Infrared spectra indicated outer-sphere coordination of Fe(III) by sulfate ions, as well as inner-sphere coordination by water molecules and bridging hydroxo groups. In the presence of excess sulfate and appropriate monovalent cations, jarosites, instead of amorphous ferric hydroxysulfates, precipitated from bacterially oxidized iron solutions. It is proposed that the jarositic precipitates result from the conversion of outer-sphere (T ~d~ ) sulfate, present in a soluble polymeric Fe(III) complex, to inner-sphere (C ~3 __v__~ ) bridging sulfate. The amorphous precipitates result from the further polymerization of hydroxo-linked iron octahedra and charge stabilized aggregation

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Author

Norman Lazaroff; Warren Sigal; Andrew Wasserman

Publisher

American Society for Microbiology

Published

1982

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)