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制备了一种新型复合膜修饰电极[GdL3(HL)]·H2O(HL=1-对甲苯基-3-甲基-4-(α-呋喃甲酰基)-5-吡唑啉酮)/聚2,2-联吡啶(Pbpy)/玻碳电极(GCE)。运用循环伏安法(CV)和脉冲伏安法(DPV),研究了电极对食品添加剂2,6-二叔丁基-4-甲基苯酚(BHT)的电化学反应与机理。与裸电极和Pbpy/GCE相比,新修饰电极测定BHT的氧化峰电流和灵敏度均显著提高。在pH=5.0,该修饰电极测试的CV曲线于Ep=0.212V处出现一个灵敏的氧化峰。峰电位差△Ep较GCE、Pbpy/GCE分别降低400mV、42mV,峰电流明显增加。在最佳条件下,氧化峰电流与BHT浓度于6.0×10-6~2.0×10-4mol·L-1范围内呈现良好的线性关系,检出限为1×10-8mol/L。
A novel composite membrane modified electrode [GdL3 (HL)] · H2O (HL = 1-p-tolyl-3-methyl-4- (α-furoyl) 2,2-bipyridyl (Pbpy) / glassy carbon electrode (GCE). The electrochemical reaction and mechanism of the electrode on 2,6-di-tert-butyl-4-methylphenol (BHT) were studied by cyclic voltammetry (CV) and pulse voltammetry (DPV). Compared with the bare electrode and Pbpy / GCE, the newly modified electrode measured BHT oxidation peak current and sensitivity were significantly increased. At pH = 5.0, the CV curve of the modified electrode showed a sensitive oxidation peak at Ep = 0.212V. Ep potential difference Ep than GCE, Pbpy / GCE decreased 400mV, 42mV, peak current increased significantly. Under the optimal conditions, the oxidation peak current showed a good linear relationship with the concentration of BHT in the range of 6.0 × 10-6 ~ 2.0 × 10-4mol·L-1 with a detection limit of 1 × 10-8mol / L.