Use of marker ion and cationic surfactant plastic membrane electrode for potentiometric titration of cationic polyelectrolytes

Takashi Masadome, Toshihiko Imato

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8 Citations (Scopus)


A plasticized poly (vinyl chloride) (PVC) membrane electrode sensitive to stearyltrimethylammonium (STA) ion is applied to the determination of cationic polyelectrolytes such as poly (diallyldimethylammonium chloride) (Cat-floc) by potentiometric titration, using a potassium poly (vinyl sulfate) (PVSK) solution as a titrant. The end-point of the titration is detected as the potential change of the plasticized PVC membrane electrode caused by decrease in the concentration of STA ion added to the sample solution as a marker ion due to the ion association reaction between the STA ion and PVSK. The effects of the concentration of STA ion, coexisting electrolytes in the sample solution and pH of the sample on the degree of the potential change at the end-point were examined. A linear relationship between the concentration of cationic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 2 × 10-5 to 4 × 10-4 N for Cat-floc, glycol chitosan, and methylglycol chitosan.

Original languageEnglish
Pages (from-to)663-668
Number of pages6
Issue number4
Publication statusPublished - 2003 Jul 4



  • Cationic polyelectrolyte
  • Colloidal titration
  • Glycol chitosan
  • Methylglycol chitosan
  • Poly (diallyldimethylammonium chloride)
  • Potentiometric titration
  • Surfactant-ISE

ASJC Scopus subject areas

  • Analytical Chemistry

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