Potassium ion-selective optodes based on the Calix[6]arene hexaester and application in human serum assay

Wing Hong CHAN*, Albert W M LEE, Daniel W J KWONG, Wing Leong Tam, Ke Min Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

11 Citations (Scopus)

Abstract

Plasticized PVC membranes incorporating the hexaester of calix[6]arene, potassium tetrakis (4-chlorophenyl) borate and a neutral H+-selective chromo-ionophore (ETH 5294) have been used as reversible sensing devices for optical determination of potassium ion in pH-buffer solutions. At pH 9.0, the absorbance response of the optode shows a good correlation with the theoretically derived formula in the range from 1 x 10-6 to 1 x 10-2 mol l-1 potassium ion. Typical response times (t95) in the samples are 3 min, the relative standard deviation for repeated measurements being within 0.5%. The selectivity of this potassium-selective membrane allows its application for the reversible optical detection of potassium concentration in human serum samples.

Original languageEnglish
Pages (from-to)531-534
Number of pages4
JournalThe Analyst
Volume121
Issue number4
DOIs
Publication statusPublished - Apr 1996

Scopus Subject Areas

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

User-Defined Keywords

  • Calixarene ionophore
  • Ion-selective membrane
  • Optode membrane
  • Potassium concentration in serum
  • Potassium determination

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