第31卷第2期精细与专用化学品Feb.20232023年2月FineandSpecialtyChemicals自动电位滴定法测量牙膏中的二价锡含量张海鸿(高露洁棕榄(中国)有限公司,广东广州510730)摘要:建立了电位滴定法自动测定牙膏中二价锡(Sn2+)的方法。在酸性溶液中Sn2+与碘(I2)进行氧化还原反应,过量的I2用硫代硫酸钠标准溶液滴定,从而测定Sn2+的含量。该方法操作简便,能准确测定牙膏中的Sn2+含量,相对标准偏差(RSD)为0.85%~1.07%,回收率为96.9%~99.3%,满足测试要求。关键词:自动电位滴定法;牙膏;二价锡;还原性锡中图分类号:TQ075文献标志码:A文章编号:1008-1100(2023)02-0029-03DOI:10.19482/j.cn11-3237.2023.02.07DeterminationofdivalenttinintoothpastebyautomaticpotentiometrictitrationZHANGHai-hong(ColgatePalmolive(China)Co.,Ltd.,Guangzhou510730,China)Abstract:Anautomaticpotentiometrictitrationmethodwasdevelopedtodeterminethedivalenttinintoothpaste.DuringtheredoxreactionbetweenSn2+andI2inacidicsolution,theexcessiveI2wastitratedwithNa2S2O3standardsolutiontodeterminetheassayofdivalenttin.Themethodoperationwaseasy.Itcanaccuratelydeterminetheassayofdivalenttinintoothpastewiththerelativestandarddeviation0.85%~1.07%,andtherecoveryrate96.9%~99.3%,whichcanmeetthetestingrequirements.Keywords:automaticpotentiometrictitration;toothpaste;divalentt...