An electrochemical sensor for dipyrone determination based on nickel-salen film modified electrode

• Published in: Procedia chemistry Vol. 1; no. 1; pp. 297 - 300
• Main Authors: Teixeira, Marcos F.S., Dadamos, Tony R.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2009
• Subjects: amperometric detection; dipyrone analysis; modified electrode; nickel-salen polymer; amperometric detection; modified electrode; nickel-salen polymer; dipyrone analysis
• ISSN: 1876-6196; 1876-6196
• DOI: 10.1016/j.proche.2009.07.074

An amperometric dipyrone sensor based on a polymeric nickel-salen (salen = N,N´-ethylenebis(salicydeneiminato)) film coated platinum electrode was developed. The sensor was constructed by electropolymerization of nickel-salen complex at a platinum electrode in acetonitrile/tetrabuthylamonium perchlorate by cyclic voltammetry. After cycling the modified electrode in a 0.50 mol L-1 KCl solution, the estimated surface concentration was found to be equal to 1.29 x 10-9 mol cm-2. This is a typical behavior of an electrode surface immobilized with a redox couple that can usually be considered as a reversible single-electron reduction/oxidation of the nickel(II)/nickel(III) couple. A plot of the anodic current versus the dipyrone concentration for chronoamperometry (potential fixed = +0.50 V) at the sensor was linear in the 4.7 x 10-6 to 1.1 x 10-4 mol L-1 concentration range and the concentration limit was 1.2 x 10-6 mol L-1. The proposed electrode is useful for the quality control and routine analysis of dipyrone in pharmaceutical formulations.