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Amorphous Clay Minerals in Some Scottish Soil Profiles

Published online by Cambridge University Press:  14 March 2018

B. D. Mitchell  and
V. C. Farmer
B. D. Mitchell
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
V. C. Farmer
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
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Abstract

Examination of clays from surface and basal horizons of four Scottish soils by differential thermal analysis, before and after heating to 600°C and by infra-red spectroscopy indicates that these contain a proportion of highly hydrated amorphous material, resembling allophane in its properties, and that this component is particularly high in clays from the surface horizons with the greatest organic matter content. This conclusion is consistent with the cation-exchange capacities of the clays and with the amounts of silica and alumina extractable from them by hot sodium carbonate solutions. The ratio of silica to alumina in these extracts indicates that the amorphous material is highly siliceous.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 5 , Issue 28 , December 1962 , pp. 128 - 144
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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