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Pure Appl. Chem.,
Vol. 69, No. 7, pp.1481-1487, 1997
COMMISSION ON SEPARATION METHODS IN ANALYTICAL CHEMISTRY
Classification and Characterization
of Stationary Phases for Liquid Chromatography
Part II: Characterization of Ion Exchange Chromatographic Stationary
(IUPAC Recommendations 1997)
Abstract: In order to characterise ion exchange chromatographic
stationary phases the thermodynamic exchange constant and the free energy
interaction parameters are recommended. These parameters are calculated
from the experimentally available corrected selectivity coefficient
vs. exchanger phase composition functions. The equations used for the
calculations have been obtained by introducing the Friedman equation
(developed for the calculation of the excess free energy change) into
the thermodynamic derivation. The suggested parameters also make possible
the estimation of the value of the selectivity coefficient at an arbitrary
exchanger phase composition. The characteristic parameters of the ion
exchange resins and the equations in a directly suitable form for the
estimation of the selectivity coefficient are calculated and presented
for several systems.
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