%0 Journal Article
%T A New Composition for Co(II)-porphyrin-based Membranes Used in Thiocyanate-selective Electrodes
%A Dana Vlascici
%A Eugenia Fagadar-Cosma
%A Otilia Bizerea-Spiridon
%J Sensors
%D 2006
%I MDPI AG
%R 10.3390/s6080892
%X In the present paper, the potentiometric response characteristics of ametalloporphyrin-based electrode in o-nitrophenyloctylether (o-NPOE) plasticizedpolyvinyl chloride (PVC) membrane are presented for a set of monovalent anions. Asmembrane ionophore, 5,10,15,20-tetrakis-(4-methoxyphenyl)-porphyrin-Co(II)(CoTMeOPP) was used. To establish the optimum composition of the membrane, differentmolar percents of cationic derivative (mol.% relative to ionophore) were used. Electrodesformulated with membranes containing 1 wt.% ionophore, 66 wt.% o-NPOE, 33 wt.% PVC(plasticizer: PVC = 2:1) and the lipophilic cationic derivative (35 mol%) are shown toexhibit high selectivity for thiocyanate with a near-Nernstian slope in the workingconcentration range of 1.0¡Á10£¿1¨C1.0¡Á10£¿5 M, with a good stability in time.
%K metalloporphyrins
%K thiocyanate
%K anion-selective electrode
%K near-Nernstian slope.
%U http://www.mdpi.com/1424-8220/6/8/892