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DETERMINATION OF THIOCYANATE USING AN IRONPORPHYRIN-BASED SENSOR
Abstract:
In the present paper, the potentiometric response characteristics of a metalloporphyrin-based electrode in plasticized polyvinyl chloride (PVC) membranes are presented for a set of monovalent anions. As membrane ionophore, 5,10,15,20-tetrakis-(3,4-dimethoxyphenyl)-porphyrin-Fe(III) (FeMeOPP) was used. To establish the optimum composition of the membrane, different ionic additives (mol.% relative to ionophore) were used. Electrodes formulated with membranes containing 1 wt.% ionophore, 66 wt.% o-NPOE, 33 wt.% PVC (plasticizer: PVC = 2:1) and the lipophilic cationic derivative TDMACl (20mol%) are shown to exhibit high selectivity for thiocyanate with a near-Nernstian slope in the working concentration range of 1.0×10−1–5.0×10-6 M, with a good stability in time.

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