电位滴定法测定对甲基苯磺酸中硫酸  

Determination of sulfuric acid in p-toluenesulfonic acid by potentiometric titration

作　　者：王立芹 邢伶 王艳[1] 刘友彬 王瑞菲 岳涛 WANG Liqin;XING Ling;WANG Yan;LIU Youbin;WANG Ruifei;YUE Tao(Shandong Chemical Technology Academy,Qingdao University of Science&Technology,Jinan 250014,China)

机构地区：[1]青岛科技大学山东化工研究院,济南250014

出　　处：《化学分析计量》2023年第3期22-25,共4页Chemical Analysis And Meterage

基　　金：山东省政府“泰山学者”建设工程资金项目(编号20130918)。

摘　　要：建立了一种电位滴定仪测定对甲基苯磺酸中硫酸含量的方法。采用氯化钡-氯化镁沉淀硫酸根,将沉淀过滤后,以铬黑T为指示剂,用光度电极做指示电极,于640 nm波长下,用乙二胺四乙酸二钠(EDTA)滴定过量的氯化钡-氯化镁,测定结果与模拟样品理论值一致,测定结果的相对标准偏差小于3%(n=6)。当硫酸质量分数不小于1%时,该方法的重复性和准确性均优于HG/T 5623—2019手动滴定方法。A potentiometric titration for the determination of sulfuric acid in p-toluenesulfonic acid was established by optimizing the instrument parameters and sample pretreatment methods.The sulfate was precipitated by barium chloridemagnesium chloride solution,and the precipitation was filtered.Chromium black T was used as the indicator,coupled with photometric electrode,and the excess barium chloride-magnesium chloride was titrated with ethylenediaminetetraacetic acid disodium(EDTA)standard solution at a working wavelength of 640 nm.The measured results were consistent with the theoretical values of simulated samples,and the relative standard deviation of determination results was less than 3%(n=6).The repeatability and accuracy of this method were better than those of manual titration in HG/T 5623—2019 when the mass fraction of sulfuric acid was not less than 1%.

关 键 词：电位滴定法 光度电极 硫酸 对甲基苯磺酸 

分 类 号：O657.1[理学—分析化学]