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

 

A.-E. Radi,^1,* M. Mostafa,¹ T. Hegazy,² R. Elshafey¹

¹ Department of Chemistry, Faculty of Science (Dumyat), Mansoura University, 34517 Dumyat, Egypt

² Department of Environment Sciences, Faculty of Science (Dumyat), Mansoura University, 34517 Dumyat, Egypt

 

DOI: 10.4152/pea.201006417

 

Abstract

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.

Keywords: differential pulse voltammetry, glassy carbon electrode, electrochemical oxidation, cibacron red FN-R, reactive red 238.

 

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* Corresponding author. E-mail address: abdradi@yahoo.com

Received 28 August 2010; accepted 26 November 2010