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A New Composition for Co(II)-porphyrin-based Membranes Used in Thiocyanate-selective Electrodes
West University of Timisoara, Faculty of Chemistry-Biology-Geography, Inorganic Chemistry Department, 16 Pestalozzi Str., Timisoara-300115 (Romania)
Institute of Chemistry Timisoara of Romanian Academy, 24 M. Viteazul Ave., Timisoara-300223 (Romania)
* Author to whom correspondence should be addressed.
Received: 22 April 2006; Accepted: 26 July 2006 / Published: 24 August 2006
Abstract: 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 1.0×10−1–1.0×10−5 M, with a good stability in time.
Keywords: metalloporphyrins; thiocyanate; anion-selective electrode; near-Nernstian slope.
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Vlascici, D.; Fagadar-Cosma, E.; Bizerea-Spiridon, O. A New Composition for Co(II)-porphyrin-based Membranes Used in Thiocyanate-selective Electrodes. Sensors 2006, 6, 892-900.
Vlascici D, Fagadar-Cosma E, Bizerea-Spiridon O. A New Composition for Co(II)-porphyrin-based Membranes Used in Thiocyanate-selective Electrodes. Sensors. 2006; 6(8):892-900.
Vlascici, Dana; Fagadar-Cosma, Eugenia; Bizerea-Spiridon, Otilia. 2006. "A New Composition for Co(II)-porphyrin-based Membranes Used in Thiocyanate-selective Electrodes." Sensors 6, no. 8: 892-900.