以实际检测为导向的仪器分析实验教学实践

Teaching Practice of Actual Testing-oriented Instrumental Analysis Experiment

为了实现学在课堂用于课外的仪器分析训练目标,以实际检测为导向,设计了一个仪器分析实验项目——市售食盐中不同形态碘的含量测定。通过精密度和加标回收率实验,验证了自动电位滴定法的准确性和替代传统国标手动滴定法的可行性。教学实践结果表明,滴定实验现象明显,项目内容充实,检测报告可自动生成以供量值溯源,极大地激发了学生的学习兴趣。

In order to achieve the instrumental analysis training goal of practicing the skills learned in the classroom for extracurricular use,an instrumental analysis experiment is designed to determine the content of iodine in different forms in commercially available table salts with the orientation of actual testing.The accuracy of the automatic potentiometric titration method and the feasibility of replacing the traditional manual titration of the national standard method are verified through the precision and spiking recovery experiments.The teaching practice shows that the titration phenomenon is obvious,the workload of the project is substantial,and the test report is automatically generated by the instrument to realize the traceability of the measurable value,which greatly stimulates the students’interest in learning.