Flow injection analysis of potassium using an all-solid-state potassium-selective electrode as a detector

Shinichi Komaba, Junko Arakawa, Michiko Seyama, Tetsuya Osaka, Ikuo Satoh, Sadako Nakamura

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The concentration of potassium was determined by a combination of flow injection analysis (FIA) with an all-solid-state potassium sensor detection. The all-solid-state potassium-selective electrode possessing long-term potential stability was fabricated by coating an electroactive polypyrrole/poly(4-styrenesulfonate) film electrode with a plasticized poly(vinyl chloride) membrane containing valinomycin. The simple FIA system developed in this laboratory demonstrated sensitivity identical to that in the batch system and achieved considerably rapid assay (150 samples h -1). Analyses of soy sauce and control serum samples by this FIA system yielded results in good agreement with those obtained by conventional measurements.

Original languageEnglish
Pages (from-to)1293-1297
Number of pages5
Issue number6
Publication statusPublished - 1998 Aug



  • Flow injection analysis
  • Ion selective electrode
  • Potassium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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