有机元素分析仪测定丙烯腈-衣康酸共聚物中衣康酸的含量

Determination of itaconic acid content in acrylonitrile-itaconic acid copolymer by organic element analyzer

建立有机元素分析仪测定丙烯腈-衣康酸共聚物中衣康酸含量的方法。采用二甲基甲酰胺溶解、甲醇沉降纯化和灼烧的方法验证了样品纯度,用有机元素分析仪测定样品中氧的含量,通过计算氧含量得到了衣康酸的含量。采用苯甲酸建立标准工作曲线,氧的质量在30~1570μg范围内与响应信号成良好的线性关系,线性相关系数为0.999,测定结果的相对标准偏差为1.9%(n=6),加标回收率为99.1%~100.5%。该方法简单快速,准确度和精密度高,适合丙烯腈-衣康酸共聚物中衣康酸含量的快速测定。

A method based on organic element analyzer was developed for determination of itaconic acid content in acrylonitrile-itaconic acid copolymer.The purity of samples was verified with methanol precipitation of sample dimethylformamide solution and burning,and the oxygen content was determined by useing organic element analyzer.Itaconic acid content of acrylonitrile-itaconic acid copolymer was calculated through oxygen content.The standard working curve was established by using benzoic acid,the mass of oxygen had good linear relationship with the response signal in the range of 30-1570μg,the linear correlation coefficient was 0.999.The relative standard deviation of determination results was 1.9%(n=6),the standard recovery rate was 99.1%-100.5%.The method is simple,fast,high accurate and precise,which is suitable for determination of itaconic acid content in acrylonitrile-itaconic acid copolymer.