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The chemical modelling of clay/electrolyte interactions for montmorillonite

Published online by Cambridge University Press:  09 July 2018

P. Fletcher  and
G. Sposito
P. Fletcher
Affiliation:
Schlumberger Cambridge Research, PO Box 153, Cambridge CB3 0HG, UK
G. Sposito
Affiliation:
Department of Plant and Soil Biology, The University of California, Berkeley, Ca 94720, USA
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Abstract

A study of the ion-exchange properties of montmorillonite has been performed in order to facilitate computer predictions of the chemical properties of natural fluids and mineral assemblies. Clay/electrolyte interactions can be described using a technique based on the concept of hypothetical surface complex formation. This technique, which is compatible with ion-association models such as GEOCHEM, can be used to simulate simultaneous ion-exchange, hydrolysis of clay edges and anion adsorption on clay surfaces. Effects such as variable cation-exchange capacity and compositionally dependent exchange constants, normally indicating non-ideal behaviour, can be simulated using different combinations of ideal reactions involving charged surfaces and complexing groups representing clay edges. The modelling procedures are flexible and thermodynamically self-consistent. The techniques were applied to data on the ion-exchange characteristics of Wyoming bentonite to yield thermodynamic data for the reactivity of this clay with alkali metals, alkaline earths and a range of first-row transition metals at 25°C.

Type
Research Article
Information
Clay Minerals , Volume 24 , Issue 2 , June 1989 , pp. 375 - 391
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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