易熔玻璃中B_2O_3的EDTA掩蔽测定方法  

EDTA Masking Method to Determine B_2O_3 in Low-melting Glasses

作　　者：葛荣田 张蓉凤 

机构地区：[1]中国红光电子管厂玻璃分厂

出　　处：《玻璃与搪瓷》1991年第1期18-22,共5页Glass & Enamel

摘　　要：易熔玻璃中含有大量的氧化铅及部分氧化锌,铅锌元素的存在对用酸碱滴定法测定三氧化二硼有影响。因为在滴定过程中Pb^++和Zn^++会生成氢氧化物沉淀消耗碱液,所以必须分离。而一般控制pH值的方法又很难将铝铅锌三者同时沉淀完全。Low molting glasses contain a great amount of lead oxide and zinc oxide which interfere in the determination of B2O3 by neutralization titration. Based on the complexometric titra-tion principle, a method was proposed to determine B2O3 in low melting glasses using Ga-BDTA as a screening agent at pH=7. The B2O3 value measured by this method is in agreement with that by ion-exchange method. The result indicates that the method of determining boric oxide by using Ca-EDTA to mask lead and zinc ions is successful.

关 键 词：易熔玻璃 三氧化二硼 测定 EDTA 

分 类 号：TQ171.737[化学工程—玻璃工业]