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Chemical dissolution techniques in the study of soil clays: Part II

Published online by Cambridge University Press:  09 July 2018

E. A. C. Follett ,
W. J. McHardy ,
B. D. Mitchell  and
B. F. L. Smith
E. A. C. Follett
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
W. J. McHardy
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
B. D. Mitchell
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
B. F. L. Smith
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
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Abstract

The removal of the alkali-soluble fraction from soil clays has been found to influence markedly the efficiency with which iron oxides can be removed from such clays. In clays pretreated with 5% Na2CO3, up to 40% more iron oxide was extracted by dithionite (Na2S2O4) than from soil clays treated with this reagent alone. Chemical analysis, electron microscopy, X-ray and differential thermal examination, and specific surface area and cation-exchange capacity measurements indicated an improved dispersion brought about by the removal of aluminosilicate binding material by Na2CO3. The electron-optical studies also showed that the dithionite-soluble iron was principally in the form of small granules. These were amorphous to X-rays and electrons and chemical analysis of the dithionite-soluble fraction suggested that they were ferruginous complexes containing considerable quantities of silica and alumina.

Type
Research Article
Information
Clay Minerals , Volume 6 , Issue 1 , July 1965 , pp. 35 - 43
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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