ION CHROMATOGRAPHY OF ANIONS - ION-EXCHANGE OF WEAK ACIDS ON STRONGLYBASIC ANION-EXCHANGERS

A physicochemical and mathematical model of ion exchange in the system of an aqueous solution of a salt of a weak dibasic acid and a strongl y basic anion exchanger is proposed. Numerical calculations are carrie d out with an example of carbonate solutions, which are commonly used as eluents in ion chromatography, Parameters characterizing the compos ition of the solution and the ion-exchanger are introduced. It is demo nstrated that as the ion exchanger is filled with the dissociation pro ducts of a dibasic acid, the fraction of the single-charged ion in the adsorbent varies monotonically, and the fraction of the double-charge d anion goes through a maximum.