Abstract:

A method for determining urea in polyacrylamide(PAM) is established. After polyacrylamide is precipitated by potassium ferrocyanide and zinc acetate, the urea in the filtrate is reacted with 4-dimethylaminobenzaldehyde (4-DMAB) to create yellow substance, and then spectrophotometry is applied to determine the urea content. A series of polyacrylamide samples with different urea contents are synthesized. The results from precision and recovery experiments show that RSD of the 6 tests is less than 3%, and the relative deviations are less than 4.73%. The method is simple and rapid, and can provide an accurate and reliable detection method for the quality control of polyacrylamide.

Key words: polyacrylamide, urea, 4-dimethylaminobenzaldehyde, polymer

摘要：

建立了聚丙烯酰胺中尿素的测定方法。用亚铁氰化钾和乙酸锌将样品中的聚丙烯酰胺沉淀后，滤液中的尿素与4-二甲基氨基苯醛（4-DMAB）显色剂反应生成黄色物质，用分光光度法对尿素含量进行测定。合成了一系列不同含量尿素的聚丙烯酰胺样品，精密度和回收率实验显示，6次测定结果的RSD < 3%，相对测量误差均≤4.73%。方法简便、快速，为聚丙烯酰胺的质量控制提供了一种准确可靠的检测方法。

关键词: 聚丙烯酰胺, 尿素, 4-二甲基氨基苯醛, 聚合物

CLC Number: 

• TQ326.4