DEPENDENCE OF RETENTION OF IONIC SOLUTES ON THE COMPOSITION OF THE MOBILE-PHASE ELECTROLYTES IN PARTITION CHROMATOGRAPHY

On the basis of the model for partition chromatography of ionic solute s in the presence of background electrolytes, theoretical equations ar e developed to describe the retention dependence of ionic solutes on t he composition of electrolytes in the mobile phase. The theoretical eq uations were tested by calculating the expected capacity factors of va rious inorganic ions in the presence of two or three background electr olytes using experimental values obtained in a single electrolyte syst em. The predictions from the equations agreed well with experimental r etention data on hydrophilic polymer packings for both binary (acetone -water) and single solvent (water) systems.