摘要
建立了一种测定硼酸锌中三氧化二硼 (B2 O3)含量的新方法 ,即以溴甲酚绿 甲基红混合指示剂来确定硼酸的滴定起点。已有方法以甲基橙为指示剂来确定硼酸的滴定起点 ,溶液颜色由橙色变为黄色 ,变化不明显 ,因而不易掌握 ,误差大。以溴甲酚绿 甲基红混合指示剂指示时 ,溶液的颜色由绿色变为暗红色 ,变色明显 ,准确率及精密度高 。
A novel approach to analyze the content of boron trioxide in zinc borate was established using bromocresol green-methyl red mixture as indicator to determine the titration starting point. This new approach was more accurate and easier to be mastered than that of previous approach for the color change of solution in the former was from green to dark red and thus obvious, while that in the later was from orange to yellow and thus indistinct.
出处
《弹性体》
CAS
2004年第6期61-63,共3页
China Elastomerics
