Poly(Acid Chrome Blue K) Modified Glassy Carbon Electrode for the Determination of Vanillin

Poly(acid chrome blue K) modified glassy carbon electrode (GCE) was electropolymerized by cyclic voltammetric sweep in the potential range from –0.2 to 0.9 V. The characteristic of Poly(acid chrome blue K) film was studied by different methods such as electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. This modified electrode showed excellent electrocatalytic response to vanillin with the increase of the electrochemical responses. Under the optimal conditions a good linear voltammetric response could be obtained over the range of 1.0×10 -7 ~ 7.0×10 -5 mol dm -3 and the detection limit was got as 3.2×10 -8 mol dm -3 (3σ). The proposed method was successfully applied to biscuits and dark-chocolate samples with satisfactory results.