Analytical Sciences

Abstract − Analytical Sciences, 19(2), 217 (2003).

Hydrogen Ion-Selective Poly(vinyl chloride) Membrane Electrode Based on a Calix[4]arene
Demet KURUOGLU,* Esin CANEL,* Shahabuddin MEMON,** Mustafa YILMAZ,** and Esma KILIÇ* 
*Department of Chemistry, Faculty of Science, Ankara University, Ankara, Turkey
**Department of Chemistry, Selçuk University, Konya, Turkey
A hydrogen ion-selective poly(vinyl chloride) membrane electrode was constructed using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracyanomethoxycalix[4]arene as a neutral carrier. The electrode showed an apparent Nernstian response in the 2 - 11.5 pH range with a slope of 54.0±0.2 mV/pH at 20±1°C. This electrode showed a rapid response of the emf to changes in the pH, high ion selectivity with respect to lithium, sodium and potassium, and characteristics similar to those reported for the conventional pH glass membrane electrode. It can be used as a potentiometric indicator electrode in hydrofluoric acid solutions. The effects of iodide, thiocyanate, perchlorate and bromide on the characteristics of the electrode were also considered.