20757

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

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A hydrogen ion-selective electrode was prepared using 5,11,17,23-tetra -tert-butyl-25,26,27,28-tetracyanometoxy-calix[4]arene and the possibility of its use as a perchlorateion- selective electrode was investigated using its characteristic of becoming perchlorate sensitive in acidic regions. The electrode of the optimum characteristic had a composition of 1% ioriophore, 66% o-NPOE, and 33% PVC. This electrode exhibited a linear response over the range 1.0 x 10^-1 -1.0X 10^-5 M of perchlorate with a slope of 48.7 ± 0.5 mV per p[ClO14]. 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 a nions were calculated by the matched potential method .

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