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- W2023202240 abstract "The mechanism of “ion-pair” chromatography that employs a non-polar stationary phase and an amphiphilic ion in the eluent to augment the retention of oppositely charged sample components is investigated. Examination of literature data indicates that neither of the simple limiting mechanisms, “ion pairing” or “dynamic ion exchange”, can account for the observed dependence of the retention factor on the concentration of the amphiphilic ion over a sufficiently wide range of conditions. According to the ion-pairing mechanism the analyte traverses the column in the form of an ion pair whereas the dynamic ion-exchange mechanism implies that the interaction of the analyte with the hydrophobic counter-ion adsorbed on the stationary phase surface is responsible for retention. Results of the present study indicate that a mechanistic model based on the assumption that both phenomena take place concurrently does not give adequate agreement with experimental findings either. Therefore, a so-called dynamic complex exchange model is proposed that assumes a metathetical exchange of the analyte between the amphiphilic ion bound to the stationary phase and the ion pairs formed in the mobile phase. Re-examination: of earlier experimental data and the results of computer simulation suggest that this model appropriately reflects the experimentally observed hyperbolic dependence of the retention factor on the concentration of the “ion-pairing” agent as long as the retention-attenuating effect of micelle formation is negligible." @default.
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- W2023202240 date "1980-11-01" @default.
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- W2023202240 title "Mechanistic study on ion-pair reversed-phase chromatography" @default.
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- W2023202240 doi "https://doi.org/10.1016/s0021-9673(00)83876-5" @default.
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