水解反滴定法测定乙烯/乙酸乙烯酯中VA含量方法的优化  

Determination of Vinyl Acetate Content in Ethylene /Vinyl Acetate by Hydrolysis and Back Titration Method

作　　者：王敏[1] 

机构地区：[1]中国石油化工股份有限公司北京燕山分公司质量监督检验中心,北京102500

出　　处：《塑料工业》2014年第6期93-96,共4页China Plastics Industry

摘　　要：通过对ISO 8985:1998(E)水解反滴定法测定乙烯/乙酸乙烯酯(EVA)中乙酸乙烯酯(VA)含量(质量分数)的研究,发现该方法存在指示剂颜色不易判断、分析数据平行性差等问题。拟采用电位滴定法取代ISO8985:1998(E)回流反滴定法中颜色指示剂法测定EVA中VA含量,利用电位突跃点判断滴定终点,并对该方法的测定条件进行优化。结果表明,电位滴定法克服了指示剂不能准确判断滴定终点的问题,与颜色指示剂法相比,电位滴定法具有精密度高,操作简便、快捷等优点。This paper using ISO 8985：1998 （E） to determinate the vinyl acetate （VA） content in ethylene/vinyl acetate （EVA）,and found that this color-indicator titration method had lots of defects,including color determination and bad parallelism.This paper tried to use the electrometric titration to determinate the vinyl acetate （VA） content,the endpoint indicated by a sudden change in cell potential,the result showed that electrometric titration can perfectly solve all the problems of color-indicator titration method,it was more accurate and simpler,rapid than the traditional color-indicator titration method.

关 键 词：乙烯 乙酸乙烯酯 水解反滴定法 电位滴定 精密度 

分 类 号：O655.2[理学—分析化学]