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A comparison of methods for the extraction of smectites from calcareous rocks by acid dissolution techniques

Published online by Cambridge University Press:  09 July 2018

R. J. Cook
R. J. Cook*
Affiliation:
Postgraduate Research Institute for Sedimentology, The University, PO Box 227, Whiteknights, Reading RG6 2AB, UK
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Abstract

Four methods of extracting clays from calcite-rich samples were compared: (i) sodium acetate buffer solution; (ii) lithium acetate buffer solution; (iii) hydrochloric acid; (iv) liquid cation-exchange acid. The methods were tested on mixtures consisting of 80% calcite, 10% quartz and 10% hectorite. Potassium had previously been exchanged on to the interlayer sites of the clay. XRD traces of the extracted clays appeared identical with those of the original clays except for a sharpening of the 001 reflection. The bulk chemistry of the clay was unchanged except by the HCl extraction, which appeared to cause a stripping of the octahedral cations. With all of the methods the exchangeable cation content was altered; the sodium acetate method, for example, retained only 17% of the original exchangeable K+, the other methods all retaining <10%.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 1 , March 1992 , pp. 73 - 80
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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