皂化价测定方法的分析比较  

Comparative Analysis on Method of Detecting Saponification Value

作　　者：季萍[1] 孙楠[1] 陈溢华[1] 

机构地区：[1]上海工程技术大学化学化工学院,上海200065

出　　处：《上海工程技术大学学报》2003年第3期163-166,共4页Journal of Shanghai University of Engineering Science

摘　　要：分别采用国标法、电导滴定法、电位滴定法测定废油、大豆油、脂肪酸的皂化价,并对测定结果进行分析比较。结果表明,电导滴定法、电位滴定法能有效地克服有色油脂自身颜色的干扰,测定结果的相对平均偏差在5‰以下,精密度相当高。国标法的精密度在1%以下,基本符合要求。经F检验与t检验,三种分析方法间不存在显著性的精密度差异和系统误差,一致性较好,均适用于皂化价的测定。This paper studies the saponification value of waste oil,soybean oil and fatty acid with nation-standard method,conductimetric titration and potentiometric titration,making comparisons among experimental results.The results show that the conductimetric titration and the potentiometric titration can keep the colorful oils away from color disturbance effectively.The relative mean deviations of the measured values with high precision are below 5‰;The relative mean deviations of nation-standard method are below 1%,and the precision of the result is correspondent with the requirement of detection.According to F-check and t-check,there are no obvious precision differences and systematic errors among the three methods,which are suitable to the measurement of the saponification value.

关 键 词：皂化价 国标法 电导滴定法 电位滴定法 

分 类 号：TQ014[化学工程]