大学化学 >> 2020, Vol. 35 >> Issue (9): 76-82.doi: 10.3866/PKU.DXHX201908025

化学实验 上一篇    下一篇

论如何通过设计性实验提升学生的综合创新能力——以分光光度法同时测定维生素C和维生素E为例

王靖宇1,*(), 王蘅1, 熊辉1, 陈志飞1, 原弘2   

  1. 1 华中科技大学化学与化工学院, 武汉 430074
    2 华中师范大学化学学院, 国家级化学实验教学示范中心(华中师范大学), 武汉 430079
  • 收稿日期:2019-08-17 录用日期:2019-09-24 发布日期:2019-10-31
  • 通讯作者: 王靖宇 E-mail:wangjingyu@hust.edu.cn
  • 基金资助:
    中央高校基本科研业务费(2018KFYYXJJ120);湖北高校省级教学研究项目(2017095)

Discussions on How to Improve the Comprehensive Innovation Abilities of Students by Designed Experiments: An Example of Simultaneous Determination of Vitamin C and E by Spectrophotometry

Jingyu Wang1,*(), Heng Wang1, Xiong Hui1, Zhifei Chen1, Hong Yuan2   

  1. 1 School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
    2 National Demonstration Center for Experimental Chemistry Education, College of Chemistry (Central China Normal University), Wuhan 430079, P. R. China
  • Received:2019-08-17 Accepted:2019-09-24 Published:2019-10-31
  • Contact: Jingyu Wang E-mail:wangjingyu@hust.edu.cn

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摘要：

分光光度法同时测定维生素C和维生素E是一个典型的多组分同时测定实验，但是目前的测试体系对维生素C测定的误差较大（13.65%）。本文基于维生素C和维生素E的分子结构特征，剖析了影响维生素C测试准确度的原因，通过对测试体系进一步优化设计与改进，将测试误差降低至1.98%，实验证明改进后的方法准确度高、重现性好、结果更可靠。以此设计性实验为例，可多方面训练学生针对实际问题并结合理论知识优化实验设计方案，提高综合创新能力。

关键词: 同时测定, 维生素C, 维生素E, 分光光度法, 综合创新能力

Abstract:

Simultaneous determination of vitamin C and vitamin E by spectrophotometry is a typical experiment of simultaneous determination of multiple components. However, the current experimental method has a large relative error (13.7%) in the determination of vitamin C. In this paper, according to the molecular structural characteristics of vitamin C and vitamin E, we studied the factors affecting the measurement accuracy of vitamin C and improve the experimental method by optimization pf design, and the error is reduced to 1.98%. Results proved that the improved method achieved higher accuracy, better reproducibility, more reliable results and better teaching responses. Through this designed experiment, the students are guided from many aspects such as aiming at practical problems and using theoretical knowledge to optimize the experimental scheme, therefore their comprehensive innovation abilities are improved.

Key words: Simultaneous determination, Vitamin C, Vitamin E, Spectrophotometry, Comprehensive innovation ability