A Hydrogen Ion-Selective Poly(Vinyl Chloride) Membrane Electrode Based on Calix[4]arene as a Perchlorate Ion-Selective Electrode

A hydrogen ion-selective electrode was prepared using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracya-nometoxy-calix[4]arene and the possibility of its use as a perchlorate ion-selective electrode was inves-tigated using its characteristic of becoming perchlorate sensitive in acidic regions. The electrode of the optimum characteristic had a composition of 1 % ionophore, 66 % o-NPOE, and 33 % PVC. This electrode exhibited a linear response over the range 1.0 × 10−1-1.0 × 10−5 M of perchlorate with a slope of 48.7 ± 0.5 mV per p[ClO4]. The effects of the pH and the membrane composition were also investigated. The lifetime of the electrode was at least 4 months and its response time was 10-15 s. The selectivity coefficients of some anions were calculated by the matched potential method. Key Words: Calix[4]arene, perchlorate, PVC membrane ion-selective electrode, potentiometry