电位滴定法测定苯乙烯中的总醛含量  

Determination of total aldehyde in styrene by potentiometric titration

作　　者：凡瑞红 FAN Ruihong(Analysis and Test Center of Baling Petrochemical Company,SINOPEC Assets Management Corporation,Yueyang 414014)

机构地区：[1]中国石化集团资产经营管理有限公司巴陵石化分公司分析检验中心,湖南岳阳414014

出　　处：《合成纤维工业》2020年第4期84-87,共4页China Synthetic Fiber Industry

摘　　要：根据GB/T 12688.5—2019标准,使用T-50全自动电位滴定仪测定苯乙烯中总醛含量,探讨了实验操作条件对测定结果的影响。结果表明:在确保分析的标准溶液及有关试剂的准确有效的前提下,滴定过程中滴定杯中的溶液搅拌速率为30%,搅拌时间为30 min,滴定终点电位为295 mV时,采用电位滴定法测定苯乙烯中总醛含量,其加标回收率为97.14%~103.33%,相对标准偏差为0.000~0.477%;该分析方法具有分析速度快、灵敏度高、操作简便等优点。According to GB/T 12688.5—2019 standard,T-50 automatic potentiometric titrator was used to determine the total aldehyde content in styrene.The influence of experimental operation conditions on the determination results was discussed.The results showed that the recovery rate of standard addition was 97.14%-103.33%and the relative standard deviation was 0.000-0.477%when the determination of the total aldehyde content in styrene by potentiometric titration were performed under the conditions as followed:the solution stirring rate in the titration cup of 30%,stirring time 30 min,and titration end point potential 295 mV under the premise of ensuring the accuracy and effectiveness of the standard solution and related reagents;the method had the advantages of fast analysis,high sensitivity and simple operation.

关 键 词：苯乙烯 电位滴定法 第一等当点 总醛 苯甲醛 含量 测定 

分 类 号：TQ241.2+1[化学工程—有机化工]