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.
Highlights
Phenol and related compounds are used extensively in industry in the manufacture of a large variety of aromatic compounds including rubber, fertilizer, paints, drug preparations, petroleum, and agricultural industries [1,2,3]
We describe the electrochemical behavior of iodide in the presence of phenol and o-cresol
0.537 V to 0.559 V) in the presence of phenol, which is due to the deposition of the product on the surface of the electrode inhibiting to a certain extent the performance of the electrode process [33]
Summary
Phenol and related compounds are used extensively in industry in the manufacture of a large variety of aromatic compounds including rubber, fertilizer, paints, drug preparations, petroleum, and agricultural industries [1,2,3]. Some typical phenols as atmospheric pollutants are phenol, o-cresol, m-cresol, and p-cresol; phenols are noted more as water pollutants than as air pollutants [5]. It is frequently pollutant in industrial waste and occurs in soil and drinking water supplies [6]. As the manufacture and use of phenols requires qualitative and quantitative control, a wide variety of methods have been developed to determine phenolic compounds. The range of available methods extends from distillation [11], membrane extraction [12], liquid-liquid extraction [13, 14] and gas chromatography [15, 16] to more sophisticated techniques such as microwave-assisted extraction [17, 18], ultra sonication and supercritical fluid extraction [19, 20]
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