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以金属铅为基体电极，用电化学氧化手段修饰铅电极表面，制备了铅基ＰｂＳＯ４化学修饰的电极。实验表明，该修饰电极在选定条件下，对ＳＯ离子有近似能斯特响应，是一种的ＳＯ电化学传感器，并将该电极用于水泥试样中ＳＯ３的测定。
Lead as substrate electrode was modified by electrochemical oxidation of lead electrode surface, Pb Pb chemical modified electrode was prepared. Experiments show that the modified electrode has a nearly Nernst response to SO2 ions under selected conditions and is an SO electrochemical sensor. The electrode is used for the determination of SO3 in cement samples.