碘量法测定坚果油的碘值——推荐一个分析化学综合实验

Iodometry-Based Standardization of Iodine Value of Nut Oil:An Introduction of a Comprehensive Analytical Chemistry Experiment

介绍一个综合性的定量分析化学实验。实验以核桃和花生等坚果为研究对象,采用有机溶剂萃取坚果中的油脂,并利用间接碘量法测定油脂的"碘值",以衡量不同坚果油的不饱和度高低。学生通过该实验不仅能掌握液相萃取、减压过滤、旋转蒸发等样品前处理方法,更好地理解和掌握间接碘量法的工作原理、实验操作和数据处理方法,源于生活的实验素材还能进一步激发学生的学习兴趣。建议将本实验纳入本科定量分析化学综合实验课。

A comprehensive analytical chemistry experiment was introduced: oil in nuts like walnuts and peanuts was extracted by organic solvent and the iodine value of these oil was standardized via indirect iodometry to evaluate the degree of unsaturation of nut oil. By using purification techniques like extraction, filtration and distillation, as well as typical titrimetry like iodimetric method, students can interpret the experimental principles with their basic theoretical knowledge. Furthermore, life-based problem solving enhances their ability to solve problems and arouses their interest in chemistry.