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采用电聚合方法制备三聚氰胺(MA)膜修饰玻碳电极(GCE),然后采用原位恒电位沉积法制备金纳米颗粒(Au),并将其修饰于膜电极表面,制得纳米金/三聚氰胺修饰玻碳电极(Au/MA/GCE)。用扫描电子显微镜(SEM)对修饰电极进行表面形貌和元素成分分析。用循环伏安法研究亚硝酸根(NO2-)在该修饰电极上的电化学行为发现,NO2-在0.85 V出现一灵敏的氧化峰。在优化的实验条件下,NO2-在1.0×10-5～1.0×10-3mol/L浓度范围内与其氧化峰电流成线性关系,检测下限为8.9×10-7mol/L。将修饰电极用于实际样品中NO2-的检测,效果良好。
Melamine (MA) film modified glassy carbon electrode (GCE) was prepared by electropolymerizing method. Gold nanoparticles (Au) were prepared by in situ potentiostatic deposition and were modified on the surface of the membrane electrode to prepare gold / melamine modified Glassy carbon electrode (Au / MA / GCE). The surface morphology and elemental composition of the modified electrode were analyzed by scanning electron microscopy (SEM). The electrochemical behavior of nitrite (NO2-) on the modified electrode was investigated by cyclic voltammetry. It was found that NO2- showed a sensitive oxidation peak at 0.85V. Under the optimal experimental conditions, NO2- linearly correlated with the oxidation peak current in the concentration range of 1.0 × 10-5 ~ 1.0 × 10-3 mol / L with the detection limit of 8.9 × 10-7mol / L. The modified electrode for the actual sample NO2- detection, the effect is good.