Resumo

RADI, A.-E.; MOSTAFA, M.; HEGAZY, T.  e  ELSHAFEY, R.. Electrochemical Determination of Cibacron Red FN-R at Glassy Carbon Electrode. Port. Electrochim. Acta [online]. 2010, vol.28, n.6, pp.417-424. ISSN 0872-1904.

The electrochemical oxidation of cibacron red FN-R (CB) has been studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) at a glassy carbon electrode (GCE) in phosphate buffer solutions of pH (2.54-11.79) used as supporting electrolytes. The voltammetric behaviour showed that the electro-oxidation process gave rise to a single peak at 0.692 V vs. Ag-AgCl using DPV in phosphate buffer solution at (pH 3.34). The oxidation process was shown to be irreversible and adsorption-controlled. An analytical method was developed for the determination of cibacron red FN-R in phosphate buffer solution at (pH 3.34) as supporting electrolyte. The anodic peak current varied linearly with cibacron red FN-R concentration in the range 2.0´10⁻⁶ mol L^-1 to 1.0´10⁻⁵ mol L⁻¹ of cibacron red FN-R with a limit of detection (LOD) of 4.49´10⁻⁷ mol L⁻¹ and limit of quantification (LOQ) of 1.49´10^-6 mol L⁻¹. Validation parameters, such as accuracy, precision and recovery were evaluated. The proposed method was successfully applied to the determination of cibacron red FN-R in synthetic industrial effluents and the analytical results compared well with those obtained by the spectrophotometric method.

Palavras-chave : differential pulse voltammetry; glassy carbon electrode; electrochemical oxidation; cibacron red FN-R; reactive red 238.

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