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Cation Exchange Equilibria in a Mixed Soil System Containing Three Heterovalent Cations
Author(s) -
Wiedenfeld R. P.,
Hossner L. R.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200050010x
Subject(s) - chemistry , ion exchange , phase (matter) , thermodynamics , binary system , soil water , binary number , cation exchange capacity , inorganic chemistry , equilibrium solution , ion , mathematics , geology , soil science , organic chemistry , physics , arithmetic
Cation exchange equations used with soils have been suitable only for systems containing two cations. Theoretical exchange equilibria relationships for a mixed soil system containing three heterovalent cations; Ca 2+ , Mg 2+ , and Na + ; are presented. Predictive equations for this tertiary system are derived using solid phase activity coefficients and thermodynamic equilibrium constants for the three binary systems obtained from experimental data. Theoretical cation exchange equilibria described for this tertiary system are in agreement with recognized exchange properties for these three cations. Interactions between two cations as they affect the exchange behavior of a third cation are also predicted. The methods presented are applicable to systems containing any number of heterovalent cations.