Micellar Media in Cyclic Voltammetry of Di-, Trihydroxybenzenes and Their Derivatives

Voltammetric behavior of di-, trihydroxybenzenes and their derivatives on glassy carbon electrode in micellar media has been investigated. Addition of surfactants leads to shifts of anodic and cathodic peaks and increase of their currents. The best results have been observed in presence of cationic surfactant cetylpyridinium bromide. The minimal anodic to cathodic peak potential separation and highest currents for dihydroxybenzenes have been observed in this case. Oxidation of propyl gallate as well as catechol and pyrogallol derivatives goes irreversibly in water and micellar media. Effect of substitutes in molecular structure of compounds on their voltammetric characteristics has been evaluated. There is a linear dependence between oxidation currents of analytes and their concentration in the range of 5-1570 mu M with the detection limits of 2-15 mu M. Determination of analytes in model solutions has been performed. The relative standard deviation does not exceed 5%. The possibility of simultaneous determination of catechol and pyrogallol derivatives in mixtures has been shown.