Studies on the phase boundaries and the significance of ionic sites of liquid membrane ion‐selective electrodes

Philippe Bühlmann, Setsuko Yajima, Koji Tohda, Kayoko Umezawa, Seiichi Nishizawa, Yoshio Umezawa

Research output: Contribution to journalReview articlepeer-review

97 Citations (Scopus)


Attenuated total reflectance infrared spectroscopy (ATR‐IR) has been used to study the cation permselectivity of liquid‐membrane ion‐selective electrodes (ISEs). All spectroscopic evidence was found to agree with the interpretation of permselectivity as being due to complete exclusion of counter‐ions from the boundary phase. Compared to ATR‐IR, optical second harmonic generation (SHG) has an even more pronounced surface sensitivity. It has been demonstrated to be a promising new technique for the study of ISE response mechanisms, as it allows one to observe the actual phase boundary. On the other hand, further potentiometric evidence for the influence of ionic sites on the emf response was found, both by a study of membranes free of ionic sites as well as by the investigation of leaching processes at poly(viny1 chloride) membranes. Finally, the use of a photoresponsive crown ether ionophore allowed the determination of emf response characteristics in relation to the ionophore concentration without any changes in the membrane composition.

Original languageEnglish
Pages (from-to)811-816
Number of pages6
Issue number9
Publication statusPublished - 1995 Sep
Externally publishedYes


  • ATR‐IR
  • Ionic sites
  • Ion‐selective electrodes
  • Optical second harmonic generation
  • Photoresponsive ionophore

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry


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