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以壳聚糖作为石墨烯分散剂,将壳聚糖分散的石墨烯滴涂于玻碳电极表面,晾干后通过循环伏安法共沉积银离子和对氨基苯磺酸单体制备了银/聚对氨基苯磺酸/石墨烯复合膜修饰电极。实验研究了环境激素双酚A在该修饰电极上的电化学行为,优化了测定双酚A的实验条件。结果表明,该修饰电极对双酚A有良好的电催化作用,在pH6.0的磷酸盐缓冲溶液中,双酚A在0.643 V处有1个灵敏的氧化峰,峰电流与双酚A浓度在2×10-5~5×10-4mol/L范围内呈良好的线性关系。线性方程为:I(μA)=0.2793+4790.3 c(μmol/L),R2=0.9942,检出限为2×10-7mol/L(S/N=3),加标回收率在97.3%~107.4%之间,结果满意。据此建立了用石墨烯-L-氨基酸复合膜修饰电极测定食品包装材料中双酚A的快速分析方法。该修饰电极具有良好的选择性和灵敏度。
Chitosan as graphene dispersant, chitosan dispersed graphene droplets coated glassy carbon electrode surface, after drying by cyclic voltammetry co-deposition of silver ions and sulfanilic acid monomer prepared silver / Poly (aminophenyl) sulfonic acid / graphene composite film modified electrode. The electrochemical behavior of the environmental hormone bisphenol A at the modified electrode was experimentally studied, and the experimental conditions for the determination of bisphenol A were optimized. The results showed that the modified electrode had good electrocatalytic activity for bisphenol A. In the phosphate buffer solution of pH 6.0, bisphenol A had a sensitive oxidation peak at 0.643 V, the peak current was significantly correlated with the concentration of bisphenol A In the range of 2 × 10-5 ~ 5 × 10-4mol / L, there is a good linear relationship. The linear equation was: I (μA) = 0.2793 + 4790.3 c (μmol / L), R2 = 0.9942 with the detection limit of 2 × 10-7mol / L (S / N = 3) 107.4%, with satisfactory results. A rapid method for the determination of bisphenol A in food packaging materials by graphene-L-amino acid composite membrane modified electrode was established. The modified electrode has good selectivity and sensitivity.