Preparation of a Liquid Membrance Type Ion-Selective Electrode and Its Application to the Potentiometric Titration

액체막형 구리이온 선택성 전극의 제작과 전위차적정에의 응용

  • Heung Lark Lee (Department of Chemistry, College of Natural Sciences, Kyungpook University) ;
  • Seung Tae Yang (Department of Chemistry, College of Natural Sciences, Kyungpook University)
  • 이흥낙 (경북대학교 자연과학대학 화학과) ;
  • 양승태 (경북대학교 자연과학대학 화학과)
  • Published : 1985.04.20

Abstract

Construction of a liquid membrane type of cupric ion selective electrode and its application to the potentiometric titration have been studied. A liquid ion-exchange membrance was prepared by extracting Cu(II) in aqueous solution into 1-(2-pyridylazo)-2-naphthol/nitrobenzene. A Ag/AgCl internal reference electrode was dipped into the aqueous reference solution of $1.00 {\times} 10^{-3}M\;Cu(NO_3)_2$ buffered with HAc-NaAc buffer solution, which was in contact with the nitrobenzene extract. The electrode showed the nernstian response to Cu(II) in the concentration range from $1.00{\times} 10^{-6}$ to $1.00{\times} 10^{-3}$M. The most suitable ion-exchanger concentration in the liquid membrane was $1.00{\times} 10^{-4}$M. The selectivity coefficients of the electrode for the various metal cations were investigated. The electrode was applied to the potentiometric titration of Cu(II) with EDTA.

Keywords

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