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Retention model for ion-pair chromatography based on double-layer ionic adsorption and exchange.
1Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada.
Journal of Pharmaceutical and Biomedical Analysis
|January 1, 1984
Summary
This study validates an electrical double-layer model for ion sorption in chromatography. The model accurately describes ion retention in reversed-phase ion-pair chromatography by accounting for surface potential and ion interactions.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Separation Science
Background:
- Electrical double-layer models are established for ion sorption on low-capacity ion exchangers.
- Reversed-phase ion-pair chromatography involves mobile phase additives influencing retention.
Purpose of the Study:
- To demonstrate the applicability of the electrical double-layer model to reversed-phase ion-pair chromatography.
- To explain chromatographic retention mechanisms using this model.
Main Methods:
- Application of the Stern-Gouy-Chapman theory to calculate surface electrical potential (ψ(o)).
- Modeling ion exchange and surface adsorption of sample counterions.
- Comparison of model predictions with established literature phenomena in ion-pair chromatography.
Main Results:
- The electrical double-layer model successfully describes ion sorption and chromatographic retention.
- The model accounts for the role of pairing ions sorbed on the reversed-phase sorbent.
- Calculated surface potential (ψ(o)) influences sample counterion adsorption.
Conclusions:
- The electrical double-layer model provides a comprehensive framework for understanding reversed-phase ion-pair chromatography.
- The model predicts key retention phenomena observed in ion-pair chromatography.
- This approach enhances the theoretical basis of ion-pair chromatographic separations.