Tallium(I) Ion-Selective Electrodes Based on Crown Ethers

크라온에테르를 이용한 탈륨(I) 이온 선택성 전극

  • Sung Min Kim (Department of Chemistry, Gyeongsang National University) ;
  • Sung Uk Jung (Department of Chemistry, Gyeongsang National University) ;
  • Jineun Kim (Department of Chemistry, Gyeongsang National University) ;
  • Jae Sang Kim (Department of Chemistry, Gyeongsang National University)
  • 김성민 (경상대학교 자연과학대학 화학과) ;
  • 정성욱 (경상대학교 자연과학대학 화학과) ;
  • 김진은 (경상대학교 화학과및 자연과학연구소) ;
  • 김재상 (경상대학교 자연과학대학 화학과)
  • Published : 1993.08.20

Abstract

Poly(vinyl chloride)(PVC) membrane electrodes based on the lipophilic neutral carrier, dibenzo-18-crown-6(DB18C6) and benzo-15-crown-5 (B15C5) as the active sensors for Tl$^+$ ion have been prepared and tested in different content of the potassium tetrakis(4-chlorophenyl)borate (KTClPB) as lipophilic salt. Dioctyl adipate (DOA), 2-nitrophenyl phenyl ether (NPPE) and o-nitrophenyl actyl ether (NPOE) were used as plasticizing solvent mediators. Electrodes exhibited good linear responses of 40∼55 mV decade$^{-1}$ for Tl$^+$ ion within the concentration ranges 10$^{-1}$∼10$^{-5}$M TlNO$_3$. Selectivity coefficients of interfering ions (alkali metal, alkaline earth metal and some transition metal ions) for Tl$^+$-ISE were determined by separate solution method and were sufficiently small for most of them. These crown ether type ion-selective electrodes are suitable for use with aqueous solution at pH > 3.

Keywords

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