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A mechanism for the oxidation of ferrous iron in hydroxylated silicates

Published online by Cambridge University Press:  14 March 2018

W. E. Addison  and
J. H. Sharp
W. E. Addison
Affiliation:
Chemistry Department, The University, Nottingham
J. H. Sharp
Affiliation:
Chemistry Department, The University, Nottingham
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Abstract

A theoretical mechanism for the oxidation of ferrous iron in hydroxylated silicates is described. The reaction is represented by the general equation 4Fe2+ + 2nOH− + O2→4Fe3+ + (n + 2)O2− + nH2O, where n can vary. Oxidation occurs only at the surface of the mineral and is sustained by the migration of protons and electrons through the crystal. Non-oxidizable ions, such as Mg2+, and water formed during oxidation inhibit the reaction. The experimental evidence for the theory is derived, from a study of the oxidation of amphiboles.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 5 , Issue 28 , December 1962 , pp. 73 - 79
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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References

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