利用循环伏安法在0.5 mol/L H2SO4溶液中制备了活化玻碳电极并对苏丹红Ⅰ在该电极上的电化学行为进行了研究。结果表明:活化玻碳电极对苏丹红Ⅰ的电化学氧化具有明显的催化作用。利用此催化性能,建立了一种新的测定苏丹红Ⅰ的电化学方法。在pH=4.0磷酸盐缓冲溶液中,对检测条件进行了优化,利用差分脉冲伏安法进行测定,苏丹红Ⅰ在活化玻碳电极上的氧化峰峰电流与其浓度在4.00×10-8~1.00×10-5mol/L内呈良好线性关系;相关系数为0.998 9;检出限为9.00×10-9mol/L。其回归方程为:ipa(A)=0.70c+5.91×10-7。该电极具有良好的灵敏性、选择性和稳定性,可用于食品中苏丹红Ⅰ的检测。

An activated glassy carbon electrode was fabricated by cyclic voltammetry in 0. 5 mol /L H2SO4solution. Electrochemical behavior of Sudan I at the fabricated electrode was studied and the experimental results showed that the fabricated electrode exhibited excellent electrocatalytic effect on the oxidation of Sudan I. Utilizing the catalytic effect,an electrochemical method for the determination of Sudan I was developed. Further,analysis parameters were optimized in pH 4. 0 phosphate buffer solution. Differential pulse voltammetry was used for the analysis,the oxidation peak current of Sudan I increases linearly in a range from 4. 00 × 10- 8to 1. 00 × 10- 5mol/L and the linear regression equation can be expressed as ipa( A) = 0. 70c +5. 91 ×10- 7,r =0. 998 9,with a detection limit of 9. 00 × 10- 9mol/L. The activated glassy carbon electrode showed good sensitivity,selectivity and stability,and was applied to analysis of Sudan I in food products.