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Quantitative X-ray diffraction analysis using clay mineral standards extracted from the samples to be analysed

Published online by Cambridge University Press:  09 July 2018

Ronald J. Gibbs
Ronald J. Gibbs*
Affiliation:
Department of Geology, University of California, Los Angeles
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Abstract

In the quantitative X-ray diffraction analysis of a series of samples, the problems arising from the variable compositions and degrees of crystallinity of clay minerals were overcome to a great extent by the use of standards extracted from the samples. Procedures are given for separation of the montmorillonite standard by differential settling of Na-montmorillonite solvated in an ethanol solution and for isolation of the kaolinite, mica, and chlorite standards by density separation of their Na-forms in thallous formate.

Calibration curves were prepared from the X-ray diffractograms obtained for series of known mixtures of Ca-forms of the standards and the internal standard boehmite using both powder and smear-oriented mounting techniques.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 1 , July 1967 , pp. 79 - 90
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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