Evaluation of selectivity-determining factors for membrane electrodes based on naphtho-15-crown-5 by liquid-liquid extraction

Masaru Yamauchi, Toshihiko Imato, Masahiro Katahira, Yasuhiro Inudo, Nobuhiko Ishibashi

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Liquid-liquid extractions of sodium and potassium picrates with naphtho-15-crown-5 (N15C5) into 1,2-dichloroethane are studied, in order to clarify the factors governing the high potassium ion selectivity of the N15C5-based membrane electrode. The distribution coefficient of N15C5 between water and 1,2-dichloroethane was 1800 at 15°C. The formation constants of the complexes of N15C5 with the sodium ion and the potassium ion in the aqueous phase were less than unity and there was no remarkable difference between their values. Potassium picrate was mainly extracted into 1,2-dichloroethane by forming the 2:1 N15C5-potassium complex, while sodium picrate was extracted by forming the 1:1 complex. The extraction constants for sodium picrate and potassium picrate were 103.86 and 107.61, respectively, The high potassium selectivity is concluded to be due to the high extractability of the 2:1 potassium complex.

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalAnalytica Chimica Acta
Volume169
Issue numberC
DOIs
Publication statusPublished - 1985

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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