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Thiocyanate-selective electrode based on rhodium porphyrin derivates

D. VLASCICI1, O. SPIRIDON BIZEREA1, E. F GDAR-COSMA2,*

Affiliation

  1. West University of Timisoara, Faculty of Chemistry – Biology – Geography, Inorganic Chemistry Department, Pestalozzi Street, No. 16, 300115 - Timisoara, Romania
  2. Institute of Chemistry –Timioara of Romanian Academy, M. Viteazul Ave, No. 24, 300223-Timisoara, Romania

Abstract

The potentiometric response properties of an anion-selective electrode based on meso−tetraphenylporphyrin−rhodium(III) 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 near Nernstian response toward thiocyanate ions in the concentration range of 10-5–10-1 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)..

Keywords

Ion-selective electrodes, Rhodium tetraphenylporphyrin, Thiocyanate, Human biological samples.

Submitted at: Aug. 22, 2005
Accepted at: March 23, 2006

Citation

D. VLASCICI, O. SPIRIDON BIZEREA, E. F GDAR-COSMA, Thiocyanate-selective electrode based on rhodium porphyrin derivates, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 883-887 (2006)