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

研究成果: Contribution to journalArticle

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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.

元の言語英語
ページ(範囲)241-245
ページ数5
ジャーナルFresenius' Journal of Analytical Chemistry
363
発行部数3
DOI
出版物ステータス出版済み - 1 1 1999

All Science Journal Classification (ASJC) codes

  • Biochemistry

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