Derivative cathodic stripping voltammetry in the simultaneous determination of three textile dyes in aqueous solutions

Reactive dyes, such as Procion Yellow, Procion Red, and Procion Blue, were simultaneously determined in aqueous ternary solutions using derivative cathodic stripping voltammetry following adsorption on a hanging mercury drop electrode. An electrochemical cell containing Britton–Robinson buffer solution at pH 8 was used as the supporting electrolyte. The following experimental conditions were established: −0.100 V deposition potential, 80 s deposition time, 50 mV pulse amplitude, 50 mV s⁻¹ scan rate, and 0.40 mm² maximum mercury drop size. A linear response was observed over the 0.630 × 10⁻³ to 1.050, 1.441 × 10⁻³ to 1.572, and 0.198 to 1.570 mg l⁻¹ ranges for Procion Yellow, Procion Red, and Procion Blue respectively. The detection limits were 0.210 × 10⁻³, 0.480 × 10⁻³, and 0.066 mg l⁻¹ respectively, with a relative standard deviation (n = 3) of 1.22%. The accuracy of the method was evaluated by derivative spectrophotometry, certifying the results as a function of proximity. All results were similar, indicating that derivative cathodic stripping voltammetry may be efficiently applied for the simultaneous determination of textile dyes in aqueous ternary solutions.