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A method for determining the CEC and chemical composition of clays via XRF

Published online by Cambridge University Press:  09 July 2018

S. Battaglia ,
L. Leoni  and
F. Sartori
S. Battaglia*
Affiliation:
Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Area S. Cataldo, Via Moruzzil, 56124 Pisa, Italy
L. Leoni
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, 56126 Pisa, Italy
F. Sartori
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, 56126 Pisa, Italy
*
*E-mail: [email protected]
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Abstract

A new method for determining the cation exchange capacity (CEC) of clays is proposed. The method is based on X-ray fluorescence analysis of natural and Ba-exchanged clays following the analytical procedure suggested by Franzini et al. (1975). This procedure, which utilizes powder pellets and is based on a full matrix correction method, is frequently applied in Earth Sciences laboratories for the routine analysis of minerals and rocks. For the analysis of Ba-exchanged clays, Franzini's procedure has been modified slightly to account for the contribution of Ba to matrix effects.

The new method, which furnishes both the CEC and the chemical compositions of the whole natural clay samples, has been tested on the eight ‘Source Clays’ of The Clay Minerals Society. The results compare well with data reported in the literature and confirm the accuracy and precision of the method and make it a valid alternative to techniques based on wet chemistry, execution of which is usually more time-consuming and which often requires greater analytical skill.

Keywords

cation exchange capacitychemical compositionclayBa2+-exchangeX-ray fluorescence analysis
Type
Research papers
Information
Clay Minerals , Volume 41 , Issue 3 , September 2006 , pp. 717 - 725
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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