Magnesium Ion Selective Electrodes Based On β-Diketone Compounds

Hitoshi Nagashima, Koji Tohda, Yasunori Matsunari, Yukihiro Tsunekawa, Kazuhiko Watanabe, Hidenari Inoue, Koji Suzuki

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The ion selectivities for poly(vinyl chloride) (PVC)-matrix membrane ion-selective electrodes based on seven lipophilic diketone compounds were examined. All the electrodes based on the tested five β-diketone cdmpounds exhibited clear Mg2. - selectivity under high pH conditions(pH10). Especially, the electrode based on 2-acetyl-l-tetralone shows excellent Mg2. -se1ectivity, and the selectivity coefficients of the Mg2+ -electrode to Ca2+, K+ and Na+(log [formula omitted] log [formula omitted] and log [formula omitted]) in pH 10 solution were -2.2, -1.9 and -2.7, respectively. This electrode gave a response slope of about 60 mV/pMg2+ ranging from 1 Χ 10-4 to 2 Χ 10-2 M Mg2+, which corresponds to twice the usual Nernstian theoretical response slope for the divalent cation. This phenomenon is advantageous for the accurate determination of Mg2+.

Original languageEnglish
Pages (from-to)1993-2004
Number of pages12
JournalAnalytical Letters
Issue number11
Publication statusPublished - 1990 Nov


  • diketone
  • ion-selective electrode
  • magnesium
  • selectivity

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy
  • Clinical Biochemistry
  • Biochemistry, medical
  • Electrochemistry


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