Mo. Nicolassimonnot et al., CONSEQUENCES OF ION-EXCHANGE AND SORPTION EFFECTS ON PH WAVES PROPAGATING IN A STRONG-BASE ANION-EXCHANGE COLUMN, Journal of liquid chromatography, 18(3), 1995, pp. 463-487
When pH buffers are used in frontal anion exchange chromatography, it
is known that important transient pH variations may occur, even if pi-
Is are identical in preequilibration and feed. This effect was earlier
studied with the aid of equilibrium theory extended to the case where
dissociation reactions are involved. In the present paper, the sodium
acetate/acetic acid system has been revisited but accounting for sorp
tion effects. Sorption experiments were performed to determine the rat
io between stationary and mobile phases as a function of ionic concent
ration. Column experiments with respectively alkaline and acid acetate
buffers have been performed and modelled (computer program Impact). S
orption effects have been taken into account; a good prediction of pH
and acetate breakthrough curves has thus been achieved.