Study of ion exchange selectivity of organic ions by using 31P NMR spectroscopy

A. Marton, H. Sakashita, Y. Miura, E. Hiramatsu, Y. Miyazaki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Ion exchange distribution of the phenylphosphoric acid has been studied on various types of chloride form strong base resins as a function of pH at 25 °C, at 0.1 M ionic strength. Equilibrium measurements were supplemented by the study of pH dependence of the 31P NMR spectra of the resin-phase phenylphosphate species. Equations were derived to describe the pH dependence of the overall distribution coefficient and the chemical shift of the resin-phase solute species. Experimental data were evaluated by using these model equations and the values of the individual distribution coefficients, ion exchange selectivity coefficients and the resin-phase 31P chemical shifts of the mono- and divalent ions have been calculated. Comparison of distribution data of the individual species corroborated the significance of the role of hydrophobic interaction in the selectivity of organic ion exchange processes. A well-defined correlation between the ion exchange selectivity and the resin-phase 31P NMR chemical shift data has been pointed out.

Original languageEnglish
Pages (from-to)217-227
Number of pages11
Issue number2
Publication statusPublished - Feb 6 2003

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry


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