Thiocyanate-selective electrode based on rhodium porphyrin derivates

The potentiometric response properties of an anion-selective electrode based on meso-tetraphenylporphyrin-rhodium(ill) chloride as a novel ionophore incorporated into plasticized polyvinyl chloride (PVC) membranes were investigated. The effects of lipophilic cationic and anionic additives on the res...

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Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2006-04, Vol.8 (2), p.883-887
Main Authors: Vlascici, D, Bizerea, O Spiridon, Fagadar-Cosma, E
Format: Article
Language:English
Online Access:Get full text
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Summary:The potentiometric response properties of an anion-selective electrode based on meso-tetraphenylporphyrin-rhodium(ill) chloride as a novel ionophore incorporated into plasticized polyvinyl chloride (PVC) membranes were investigated. The effects of lipophilic cationic and anionic additives on the response characteristics were investigated. The testing of the electrode shows that the sensitivity, selectivity, detection limit and working range are strongly dependent of the type and concentration of the used additives. Membrane electrodes with added lipophilic cationic sites exhibit reversible and nearNernstian response toward thiocyanate ions in the concentration range of 10- -10-1 M, with a good stability in time. The electrodes were successfully applied to the potentiometric determination of thiocyanate in human biological samples (urine and saliva).
ISSN:1454-4164