Adsorbed ion activities and other thermodynamic parameters of ion-exchange defined by mole or equivalent fractions

A - Papers appearing in refereed journals

Goulding, K. W. T. 1983. Adsorbed ion activities and other thermodynamic parameters of ion-exchange defined by mole or equivalent fractions. Journal of Soil Science. 34 (1), pp. 69-74.

AuthorsGoulding, K. W. T.
Abstract

The ‘Gaines and Thomas’ method for calculating the thermodynamic parameters of a cation exchange process has been criticized because equivalent rather than mole fractions were used in the definition of adsorbed ion activity coefficients. Although such coefficients are thus not theoretically correct, comparison with directly measured enthalpies of exchange shows that they indicate heterogeneity in the exchange process correctly. They also differ little from coefficients defined in terms of mole fractions. Such a re‐definition alters values of the thermodynamic equilibrium constant, and free energy and entropy of exchange by a constant factor, independent of cations and exchanger. Comparisons of series of cations, soils or clays using these parameters are therefore not affected.

KeywordsSoil Science
Year of Publication1983
JournalJournal of Soil Science
Journal citation34 (1), pp. 69-74
Digital Object Identifier (DOI)doi:10.1111/j.1365-2389.1983.tb00813.x
Open accessPublished as non-open access
Output statusPublished
Publication dates
Print01 Mar 1983
Copyright licensePublisher copyright
PublisherWiley
ISSN0022-4588

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