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Pure Appl. Chem., Vol. 69, No. 7, pp.1481-1487, 1997

ANALYTICAL CHEMISTRY DIVISION

COMMISSION ON SEPARATION METHODS IN ANALYTICAL CHEMISTRY

Classification and Characterization of Stationary Phases for Liquid Chromatography
Part II: Characterization of Ion Exchange Chromatographic Stationary Phases

(IUPAC Recommendations 1997)

A. Marton

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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