Electrochemical Determination of Cibacron Red FN-R at Glassy Carbon Electrode

Abstract

The electrochemical oxidation of c ibacron 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 .