醋酸镍催化法快速测定油脂碘值  

Nickel acetate catalytic method for rapid determination of oil iodine value

作　　者：彭阳[1] 施文健[1] 刘毅[1] 蒋方圆 闻海峰[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《中国油脂》2017年第12期130-132,136,共4页China Oils and Fats

基　　金：国家自然科学基金项目(51208299)

摘　　要：建立了以醋酸镍为催化剂快速测定油脂碘值的方法,并与韦氏法进行比较。结果表明:20℃下,以大豆油为试样,韦氏法反应30 min时碘值(I)为125.8 g/100 g,反应转化率为99.2%。以醋酸镍作为催化剂,反应10 min碘值(I)即可达到125.9 g/100 g,反应转化率为99.8%。8次平行实验中,韦氏法和醋酸镍催化法的标准偏差分别为0.299和0.456,两种方法的相对误差仅为0.81%。因此,醋酸镍催化法测定油脂碘值具有方法准确、操作简便、毒性小等优点,是一种良好的油脂碘值快速测定方法。A method for rapid determination of oil iodine value with nickel acetate as catalyst was established, and it was compared with Wijs method. The results showed that at 20℃, the iodine value of soybean oil was 125.8 gI/100 g after reaction for 30 min and the conversion rate was 99.2% with Wijs method, while the iodine value was 125.9 gI/100 g after reaction for 10 min and the conversion rate was 99.8% with nickel acetate as catalyst. In the eight parallel experiments, the standard deviations of the two methods were 0.299 and 0.456, respectively, and the relative error of the two methods was only 0.81%. So the nickel acetate catalytic method was a good method for rapid determination of oil iodine value with advantages of accuracy, simpleness and mild toxicity.

关 键 词：油脂 碘值 醋酸镍 催化 韦氏法 

分 类 号：TQ646.4[化学工程—精细化工]