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  • Ideal Behavior in Na+-Trace Metal Cation Exchange on Camp Berteau Montmorillonite

  • Garrison Sposito, Shas V. Mattigod
  • Journal:
    Clays and Clay Minerals / Volume 27 / Issue 2 / April 1979
    Published online by Cambridge University Press:
    01 July 2024, pp. 125-128
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  • The conditions under which an exchanger phase will behave as an ideal mixture are established from thermodynamic principles. It is shown that, if a stoichiometric cation-exchange reaction is reversible, the exchanger phase will exhibit ideal behavior if the Vanselow selectivity coefficient is independent of the exchanger composition. This criterion is applied to some recently published data for Na+-trace metal cation exchange on Camp Berteau montmorillonite. An analysis of the data suggests that, so long as the exchange process is reversible, Na+-trace metal cation exchange produces an exchanger phase that behaves as an ideal mixture.