中文摘要：

将3-氨丙基-三乙氧基硅烷（ATS）修饰在玻碳电极表面，再自组装一层纳米金，制备了一种新型NO2^-的电化学传感器。该修饰电极对NO2^-有较好的催化作用。在pH为3时，NO2^-的氧化峰电流与其浓度在5．0×10^-7～1．0×10^-3mol／L范围内呈良好的线性关系，检出限可达2．0×10^-7mol／L。方法具有较高的灵敏度和较好的重现性。

英文摘要：

Sol-gel film modified electrodes were fabricated by （3-aminopropyl）- trimethoxysilane on glass carbon electrode（GCE）. Colloidal gold particles were then chemisorbed onto the amine groups of the solgel. The prepared modified electeodes showed good electrocatalytic activities for nitrite and were used as sensors for nitrite. The oxidation peak current of nitrite is proportional to the concentration of nitrite over the range of 5.0 × 10^-7 -1.0 × 10^-3 mol/L with the detection limit of 2.0 × 10^-7 mol/L estimated at a signal-to-noise ratio of 3. The proposed method exhibited good reproducibility and high sensitivity.