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Reactions catalysed by minerals. IV. The mechanism of the benzidine blue reaction on silicate minerals

Published online by Cambridge University Press:  09 July 2018

D. H. Solomon ,
B. C. Loft  and
Jean D. Swift
D. H. Solomon
Affiliation:
Division of Applied Mineralogy, C.S.I.R.O., Melbourne, Australia
B. C. Loft
Affiliation:
Division of Applied Mineralogy, C.S.I.R.O., Melbourne, Australia
Jean D. Swift
Affiliation:
Division of Applied Mineralogy, C.S.I.R.O., Melbourne, Australia
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Abstract

The oxidation of benzidine to benzidine-blue on silicate minerals is shown to occur at aluminium atoms exposed at crystal edges and at transition metal atoms in the higher valency state present in the silicate lattices. The transition metals in the silicate lattice undergo chemical oxidation-reduction reactions.

Changes in the colour of the benzidine-blue radical cation with the conditions of reaction are discussed in terms of the solvent used for the reaction and its influence on the pH of the mineral surface.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 4 , December 1968 , pp. 389 - 397
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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