%0 Journal Article
%T Electrochemical Study of Iodide in the Presence of Phenol and o-Cresol: Application to the Catalytic Determination of Phenol and o-Cresol
%A Lida Fotouhi
%A Mahsa Ganjavi
%A Davood Nematollahi
%J Sensors
%D 2004
%I MDPI AG
%R 10.3390/s41100170
%X The electrochemical oxidation of iodide in the presence of phenol and o-cresol was investigated at a glassy carbon electrode in buffered media by cyclic voltammetry, linear sweep voltammetry and controlled¨Cpotential coulometry. The experimental results indicate that the phenol and o-cresol convert to their derivatives after participating in a halogenation coupled reaction (quasi-catalytic reaction) following the oxidation of iodide to iodine. The concentrations of phenol and o-cresol have been determined in aqueous solutions according to the linear dependence of quasi-catalytic peak currents with the concentration. The calibration graphs show two linear sections of 0.0 to 1.0¡Á10-4 M and 2.0¡Á10-4 to 1.0 ¡Á10-3 M for phenol and 4.2¡Á10-5 to 1.0¡Á10-4 M and 2.0¡Á10-4 to 1.0¡Á10-3 M for o-cresol. The theoretical detection limits and the relative standard deviations for ten measurements of phenol and o-cresol are 1.125¡Á10-5 M, 1.06% and 4.201¡Á10-5 M, 1.44%, respectively.
%K Electrochemical study
%K determination
%K phenol
%K o-cresol
%U http://www.mdpi.com/1424-8220/4/11/170