滴定法测定聚醚多元醇中的羟基值

Titration polyether alcohol the hydroxyl value

本法主要是通过称取定量的聚醚多元醇,与定量且过量的乙酰化试剂反应,后加入定量的砒啶溶液,用酚酞作指示剂,以氢氧化钾标准溶液滴定。本法的回收率达99.8%,标定和测定时的极差分别是0.75‰和1.2‰,方法结果快速、简便,准确度和精密度都比较高。实验证明用滴定法测定聚醚多元醇中的羟基值是一种较理想的分析方法。

This is mainly to pick through say: take quantitative polyether alcohol,and quantitative and excessive acylation agent reaction after joining the quantitative and Pi cefotaximes solution,make,use phenolphthalein titration with potassium hydroxide standard solution.The recovery of calibration and determination,99.8 per cent respectively,the poor is 1.2 per 1,000 0.75,methods and results of simple,rapid,accuracy and precision is higher.Experiments with titrimetry polyether alcohol the hydroxyl value is a kind of ideal analysis method.