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Characterization of X-ray amorphous material in a Scottish soil by selective chemical techniques

Published online by Cambridge University Press:  09 July 2018

B. F. L. Smith  and
B. D. Mitchell
B. F. L. Smith
Affiliation:
Department of Mineral Soils, The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland, UK
B. D. Mitchell
Affiliation:
Department of Mineral Soils, The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland, UK
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Abstract

Mixed SiO2-Al2O3-Fe2O3 gel systems are a feature of many Scottish soils. They are usually associated with the surface of primary soil particles and consequently when present even in small amounts can have an effect on soil properties incommensurate with the proportion present. Currently, chemical dissolution methods provide the most satisfactory means of assessment. A range of chemical techniques, including dissolution by alkali, dithionite, acid oxalate and pyrophosphate, trimethylsilylation and fluoride exchange, have been used to examine the inorganic gel in a Scottish brown forest soil developed on glacial till derived from epidiorite. The reactivity of the gel, as determined by fluoride exchange, is similar to that reported for Japanese and New Zealand allophanic soils.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 5 , December 1984 , pp. 737 - 744
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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