Chronoamperometric and coulometric analysis with ionophore-based ion-selective electrodes: A modified theory and the potassium ion assay in serum samples

Research output

4 Citations (Scopus)

Abstract

The behavior of the same ion-selective electrode (ISE) under three measurement modes: potentiometric, chronoamperometric and coulometric is compared using valinomycin-based K+-ISE as model system. The ISE response to decrease and to increase of the K+ ion activity is studied systematically. It is shown that the theoretical description of the time dependencies of current and of charge must take the concentration polarization in consideration, and the respective equations are presented. The concentration of K+ ion in blood serum samples is measured in the potentiometric, in the chronoamperometric and in the coulometric mode, and satisfactory results are obtained in all three cases.
Original languageEnglish
Article number127894
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume310
Early online date20 Feb 2020
DOIs
Publication statusPublished - 1 May 2020

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Metals and Alloys
  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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