【摘要】 本文介绍一种测定大气中SO2的电流型传感器。它包括一个全氟离子交换膜（Nafion417cafionicperfluorinatedmembrane）支持的电极，膜的一面镀上一层铂黑，与样品接触的铂黑作为工作电极，膜的另一面和1mol·dm－3HClO4溶液接触，电解质溶液中插入参比电极和对电极。该装置嵌入流动电池中。实验时选择工作电压为0．650V。利用此传感器装置反复做了单扫描伏安、恒电位电解试验。结果表明，本传感器具有较高的电流敏感性和短的响应时间（小于1秒），检测下限可达200ppb，在5～4500ppm之间呈良好的线性关系，信噪比大于3，稳定性好，有广阔的应用前景。更多还原

【Abstract】 The paper introduces an amperometric sensor used for determination of sulphur dioxide in a tmospheres.The sensor is composed of a perfluoro ion-exchange membrane (nafion 417) supported electrode. On one side of the membrane is plated a thin Iayer of platinum black which faces the sample and acts as working electrode, the other side of it faces an internal electrolyte solution (1 mo1. dm-3 a queous perchloric acid) containing the counter and reference electrodes. This device is inserted into a flow cell. Selected work volt for experiment is 0. 650V (versus reference electrode). We have used the sensor to repeat experiments of single-sweep voltammetry and constant potential electrolysis. The results show that the sensor possesses a high current sensitivity, a short response time (less than 1 second), and a detection lower limits of 200ppb, satisfactory linearity relationship between 5~4500ppm and singnal-to-noise of 3, good stability and versatile application更多还原