Abstract
Catalytic oxidation of thiourea has been studied at alumina modified Pt electrode using cyclic voltammetry. The results indicate the suitability of alumina modified Pt electrode for voltammetric determination of thiourea. The catalytic peak currents are linearly dependent on the thiourea concentration in the range 2.5 x 10-5 – 7.0 x 10-3 M. The usefulness of the method was tested in determination of thiourea in real samples. Moreover, in this work the heterogeneous electron transfer rate constants of thiourea at the surface of modified and unmodified Pt electrodes were estimated by comparing the experimental cyclic voltammetric responses with the digital simulated results.
Highlights
Thiourea and its derivatives are widely used in the rubber industry as accelerators, in photography as fixing agents and to remove stains from negatives, and in agriculture as fungicides, herbicides and rodenticides
In this work the heterogeneous electron transfer rate constants of thiourea at the surface of modified and unmodified platinum electrodes were estimated by comparing the experimental cyclic voltammetric responses with the digital simulated results
The electrochemical oxidation of thiourea at unmodified Pt electrode tested by digital simulation, and the heterogeneous electron transfer rate constant has been estimated by comparison of the simulation result with experimental cyclic voltamogram (Fig. 1, curve b)
Summary
Thiourea and its derivatives are widely used in the rubber industry as accelerators, in photography as fixing agents and to remove stains from negatives, and in agriculture as fungicides, herbicides and rodenticides. We present a very simple catalytic method for the analysis of thiourea based on the oxidation of it at the surface of alumina modified Pt electrode with very facile modification procedure. Electrochemical study of 0.75 mM thiourea in acetate buffer solution (C = 0.15 M, pH = 4.5) at bare Pt electrode has been studied using cyclic voltammetry (Fig. 1, curve a).
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