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Sensors 2004, 4(11), 170-180; doi:10.3390/s41100170
Article

Electrochemical Study of Iodide in the Presence of Phenol and o-Cresol: Application to the Catalytic Determination of Phenol and o-Cresol

1,* , 1 and 2
1 Department of Chemistry, Faculty of Science, Al-Zahra University, P.O. Box 1993891176, Tehran, Iran 2 Department of Chemistry, Faculty of Science, Bu-Ali-Sina University, Hamadan, Iran
* Author to whom correspondence should be addressed.
Received: 10 May 2004 / Accepted: 25 October 2004 / Published: 30 November 2004
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Abstract

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–potential 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 1.0×10-4 M and 2.0×10-4 to 1.0 ×10-3 M for phenol and 4.2×10-5 to 1.0×10-4 M and 2.0×10-4 to 1.0×10-3 M for o-cresol. The theoretical detection limits and the relative standard deviations for ten measurements of phenol and o-cresol are 1.125×10-5 M, 1.06% and 4.201×10-5 M, 1.44%, respectively.
Keywords: Electrochemical study; determination; phenol; o-cresol Electrochemical study; determination; phenol; o-cresol
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Fotouhi, L.; Ganjavi, M.; Nematollahi, D. Electrochemical Study of Iodide in the Presence of Phenol and o-Cresol: Application to the Catalytic Determination of Phenol and o-Cresol. Sensors 2004, 4, 170-180.

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