容量法测定磷酸中五氧化二磷的方法改进  

Improvement of the Method of Volumetric Analysis for the Determination of Di-phosphorus Pentoxide in Phosphoric Acid

作　　者：高粉华 

机构地区：[1]云南云峰化学工业公司质监处,云南宣威655426

出　　处：《云南化工》2000年第2期39-40,共2页Yunnan Chemical Technology

摘　　要：研究了以百里香酚蓝 -酚酞为指示剂 ,直接用碱滴定磷酸中五氧化二磷的新方法。相对标准偏差小于 0 .6 % ,回收率为 99.5%～ 10 1.5%。本方法用于测定磷酸中五氧化二磷的含量 ,获得满意结果。A new method has been studied in which thymol blue-phenolpthalein was used as indicators and alkali was directly used to titrate di-phosphorus pentoxide in phosphoric acid.RSD was less than 0.6% and the recovery was 99.5%～101.5%.The method was used to determine the content of di-phosphorus pentoxide in phosphoric acid and the result was satisfactory.

关 键 词：磷酸 直接碱滴定 五氧化二磷 容量法 

分 类 号：TQ126.34[化学工程—无机化工] TQ126.35