Excess Adsorption of Organic Eluent Components from Mobile Phases Containing Electrolytes

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Abstract

The excess adsorption isotherms of organic eluent components from solutions containing electrolytes on a C18-bonded stationary phase are investigated by frontal analysis in staircase mode. The excess adsorption of acetonitrile increases when NaHSO4, NaH2PO4, NaCl, or NaOAc is added to the eluent, but decreases upon addition of NaBr or NaClO4. The excess adsorption of acetonitrile increases in the order of NaCl, NaHSO4, NaH2PO4 > NaOAc > NaBr, NaClO4. On the other hand, the effect of electrolyte addition on the excess adsorption of methanol is not significant. The effect of electrolytes on the retention of alkylbenzenes in reversed-phase liquid chromatography is discussed on the basis of the excess adsorption of organic eluent components. The retention of alkylbenzenes shows negative correlation with the excess adsorption of acetonitrile. This indicates that the acetonitrile layer on the stationary phase does not act as a part of the stationary phase. A developed acetonitrile layer reduces the retention of alkylbenzenes by the competitive adsorption at the interface between the organic layer and the stationary phase.

Keywords

Reversed-phase liquid chromatography Excess adsorption Retention mechanism Electrolyte 

Notes

Acknowledgements

The authors are grateful to Ms. T. Oata, Ms. A. Eto, Ms. S. Oguma and Dr. N. Suzuki (Daiichi Sankyo, Japan) for their continuous encouragement.

Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest in relation to this research.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

10337_2018_3552_MOESM1_ESM.pdf (275 kb)
Supplementary material 1 (PDF 275 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ChemistryTokyo Institute of TechnologyTokyoJapan
  2. 2.Analytical and Quality Evaluation Research LaboratoriesDaiichi Sankyo Co., Ltd.HiratsukaJapan

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