Determination of tartrazine and sunset yellow in drinks by using glassy carbon electrode.

[Objective] To establish a simple and environmental friendly electrochemical method in determination of tartrazine and sunset yellow in drinks. [Methods] The tartrazine and sunset yellow was determination by differential pulse voltammetry (DPV) and the glass carbon electrode as working electrode. [Results] In 0.10 mol / L KNO3 solution, the peak current had a linear relationship with the concentration of the two colorants at the range of 0.10 to 0.80μg / ml, r (tartrazine) =0.989 and r (sunset yellow) =0.994. The detection limit of them was 0.05μg / ml. [Conclusion] The method is simple and rapid, which is suitable for determination of tartrazine and sunset yellow in drinks.