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This article in SSSAJ

  1. Vol. 36 No. 1, p. 30-34
    Received: May 18, 1971



Hydration of Cations Adsorbed on a Clay Surface from the Effect of Water Activity on Ion Exchange Selectivity1

  1. H. Laudelout,
  2. R. Van Bladel and
  3. J. Robeyns2



Ion exchange equilibria for four pairs of singly charged ions in a montmorillonite clay were carried out at different total normalities of the equilibrium solution at 25C. Only the trace region for the preferred ion was investigated. The effect of solvent activity aw on the selectivity coefficient Kc was established. In each case the expected linear relationship between ln Kc and ln aw was observed. The values for the differences of the ion hydration numbers, nwA - nwB, calculated from this purely thermodynamic relationship, were consistent and were comparable with values that could be deduced from basal spacings or anion exclusion volume data.

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