Abstract
Mixed ionic-nonionic surfactant mobile phases for ion-exclusion chromatography of carboxylic acids permitted the analysis time to be reduced by partitioning the analytes could be determined without interference even when they eluted near the void volume. These advantages result from the formation of mixed micelles of the two surfactants. The partition behaviour of both neutral and charged analytes to a nonionic micellar phase was evaluated on the basis of a retention model that included dissociation equilibria of analytes. In addition, the partition coefficients to mixed micellar phases were also determined by using this model.
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