The water uptake of plasticized poly(vinyl chloride) solid-contact calcium-selective electrodes

Tom Lindfors, Fredrik Sundfors, Lajos Höfler, R. Gyurcsányi

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A hyphenated method based on FTIR-ATR and electrochemical impedance spectroscopy has been applied to simultaneously measure the water uptake, changes in the bulk resistance and potential of plasticized poly(vinyl chloride) (PVC) based Ca2+-selective coated-wire (CaCWE) and solid-contact electrodes (CaSCISEs). Most of the water uptake of the ion-selective membranes (ISMs) used in both electrode types took place within the first 9h in 10-3M CaCl2 showing good correlation with the stabilization of the individual electrode potentials. The bulk resistance of the ISMs of the CaCWEs and the CaSCISEs with poly(3-octylthiophene) (POT) as the solid-contact (SC) increased most during the first 18h in 10-3M CaCl2. The increase in the resistance was found to be related to the exchange of K+ for Ca2+ in the ISM and the formation of the Ca2+-ionophore (ETH 5234) complex having a lower diffusivity than the free K+ ions. In contrary to previously published results on silicone rubber based SCISEs and poly(methyl methacrylate):poly(n-decyl methacrylate) membranes containing POT, the plasticized PVC-based CaSCISEs with POT as the SC had a higher water uptake than the CaCWEs. The CaSCISEs had a detection limit of 2×10-8M Ca2+ and a good potential reproducibility of 148.9±1.0mV in 10-4M CaCl2.

Original languageEnglish
Pages (from-to)2156-2163
Number of pages8
JournalElectroanalysis
Volume23
Issue number9
DOIs
Publication statusPublished - Sep 2011

Fingerprint

Vinyl Chloride
Calcium
Polyvinyl Chloride
Polyvinyl chlorides
Ion selective membranes
Electrodes
Water
Wire
Ionophores
Silicone Elastomers
Methacrylates
Polymethyl Methacrylate
Polymethyl methacrylates
Electrochemical impedance spectroscopy
Silicones
Ion exchange
Rubber
Stabilization
Ions
Membranes

Keywords

  • Electrochemical impedance spectroscopy
  • FTIR-ATR spectroscopy
  • Plasticized poly(vinyl chloride)
  • Poly(3-octylthiophene)
  • Potential stability
  • Solid-contact ion-selective electrode
  • Water uptake

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

Cite this

The water uptake of plasticized poly(vinyl chloride) solid-contact calcium-selective electrodes. / Lindfors, Tom; Sundfors, Fredrik; Höfler, Lajos; Gyurcsányi, R.

In: Electroanalysis, Vol. 23, No. 9, 09.2011, p. 2156-2163.

Research output: Contribution to journalArticle

Lindfors, Tom ; Sundfors, Fredrik ; Höfler, Lajos ; Gyurcsányi, R. / The water uptake of plasticized poly(vinyl chloride) solid-contact calcium-selective electrodes. In: Electroanalysis. 2011 ; Vol. 23, No. 9. pp. 2156-2163.
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