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用铅离子选择电极作指示电极电位滴定法测定硫酸根的方法已有不少报导,但多用于水质分析方面或无机体系中硫酸根的测定,我们应用该法对农药制备工艺中间产物里的硫酸根(SO_4~(2-))测定条件进行了选择和研究,为了便于对产品质量的控制,生产中常需对三氯杀螨醇的中间产品——对氯苯磺酸中的硫酸含量进行测定,但目前国家并无统一的分析标准,工厂中常用的是 Bacl_2—K_2cro_4滴定法,这种方法是外指示剂法,不仅手续繁索而且精度也不够。我们的研究结果表明,采用铅离子选择电极电位滴定法测定该体系的硫酸根,不仅能满足工艺中间控制的要求,而且操作简单,省时,省力,费用也低,扩大
Lead ion selective electrode as the indicator electrode potential titration method for the determination of sulfate has been reported, but more for water quality analysis or inorganic sulfate system determination, we apply the method of pesticide intermediate in the production of sulfuric acid (SO_4 ~ (2-)) were selected and studied. In order to control the quality of the products, the content of sulfuric acid in p-chlorobenzene sulfonic acid, which is the intermediate product of dicofol, was often determined in production. However, There is no uniform analytical standards, the factory is commonly used Bacl_2-K_2cro_4 titration method, this method is the external indicator method, not only the complicated procedures and the accuracy is not enough. Our results show that the determination of sulfate with lead ion selective electrode potentiometric titration not only meets the requirements of process control, but also has the advantages of simple operation, time saving, labor saving, low cost and widening