中文摘要：

通过在Nafion膜修饰玻碳电极表面电沉积铂微粒制备了甲醛电化学传感器（Pt／Nafion／GCE）。利用循环伏安法研究了甲醛在该传感器上的电化学行为，优化了实验参数，在此基础上建立了用伏安法直接测定甲醛的新方法。在酸性溶液中，甲醛的氧化峰电流与其浓度在1．0×10^-6～1．0×10^-3mol／L的范围内呈良好的线性关系（r=0．9995），检出限为5．0×10^-7mol／L。本文所提出的测定甲醛的方法具有较高的灵敏度和较好的重现性。

英文摘要：

Platinum particles were electrode to prepare a sensor electrochemically deposited on a Nafion film coated glassy carbon for determing formaldehyde. The electrochemical behaviors of formaldehyde at the sensor based on platinum particles and Nation film modified glassy carbon electrodes （Pt/Nafion/GCE） were studied by cyclic voltammetry. The experimental parameters were optimized, and a voltammetric method for determining formaldehyde was developed. The oxidation peak current of formaldehyde was proportional to the concentration of formaldehyde over the range of 1.0× 10^-6 -1.0× 10 ^-3 mol/L with the detection limit of 5.0×10^- 7 mol/L （r=0. 9995）. The presented method has been applied to determing formaldehyde in real waters and exhibited high sensitivity and good reproducibility.