End-point detection of the potentiometric titration of anionic polyelectrolytes using an anionic surfactant-selective plasticized poly (vinyl chloride) membrane electrode and an anionic surfactant as a marker ion

Takashi Masadome, Toshihiko Imato, Yasukazu Asano

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

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

    Original languageEnglish
    Pages (from-to)241-245
    Number of pages5
    JournalFresenius' Journal of Analytical Chemistry
    Volume363
    Issue number3
    DOIs
    Publication statusPublished - 1999

    All Science Journal Classification (ASJC) codes

    • Biochemistry

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