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The use of RbCl disks for the infrared spectroscopy detection of hydrated and dehydrated halloysite in mixtures with kaolinite

Published online by Cambridge University Press:  09 July 2018

E. Mendelovici  and
A. Sagarzazu
E. Mendelovici
Affiliation:
Laboratorio Físicoquimica de Materiales, IVIC, Apartado 1827, Caracas 1010-A, Venezuela
A. Sagarzazu
Affiliation:
Laboratorio Físicoquimica de Materiales, IVIC, Apartado 1827, Caracas 1010-A, Venezuela
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Abstract

A simple IR spectroscopy method for detecting hydrated and dehydrated halloysite in artificial mixtures with kaolinite is described. The method is based on the exclusive ability of RbCl among the alkali halides to form a complex with halloysite but not with kaolinite. This complex absorbs at 3500 cm−1 when hydrated halloysite or admixed halloysite is examined in RbCl disks, the limit of detection being 15% in the kaolin admixture. Heating the clay powders or corresponding RbCl disks at 110°C affects the 3500 cm−1 frequency. The development of this absorption band together with a decrease in the intensity ratio of the 3690/3620 cm−1 frequencies is proportional to increasing amounts of halloysite in the kaolin admixtures. This method has an analytical applicability and is relatively rapid.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 4 , December 1985 , pp. 493 - 498
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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