Ion-selective electrodes in organic analysis: Primary amine selective polymeric membrane electrodes based on a calix[6]arene ionophore

Wing Hong CHAN*, Kwok Keung SHIU, Xiao Hong Gu

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

64 Citations (Scopus)

Abstract

Primary alkylamine selective electrodes were designed based on the host - guest interaction between calixarene ionophore and alkylammonium ions. The poly(vinyl chloride) (PVC) membrane electrode contains 1-3% m/m of an ester derivative of calix[6]arene as the neutral carrier and dioctyl phthalate as the plasticizer. At pH 3.2, the electrode exhibits a Nernstian response in the range 1 × 10-1-3 × 10-4 mol l-1 hexylamine with a slope of 57.5 ± 0.8 mV per concentration decade. The electrode. The electrode has a fast response time of less than 1 min and a constant Nernstian response after 1 month of continuous measurement. In contrast to the traditional PVC ion-exchange membrane electrode, the present electrode system was found to be highly selective to primary amines. Hence, the primary amine content of a mixture of amines can be determined using the electrode with good accuracy and precision.

Original languageEnglish
Pages (from-to)863-867
Number of pages5
JournalAnalyst
Volume118
Issue number7
DOIs
Publication statusPublished - 1993

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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