大学化学 >> 2022, Vol. 37 >> Issue (5): 2111041.doi: 10.3866/PKU.DXHX202111041

所属专题: 第2届全国大学生化学实验创新设计竞赛

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离子选择性电极法测定茶叶及茶水中的氟含量

王小燕, 戴冬梅, 刘润泽, 卜弘凯, 王彦杰, 李会平, 李明华, 高洪涛()   

  • 收稿日期:2021-11-14 录用日期:2021-11-22 发布日期:2022-04-02
  • 通讯作者: 高洪涛 E-mail:gaohtao@qust.edu.cn
  • 作者简介:高洪涛, Email: gaohtao@qust.edu.cn
  • 基金资助:
    山东省本科教学改革研究项目重点项目(Z2020029);山东省本科教学改革研究项目重点项目(Z2021020);教育部2019年第二批产学合作协同育人项目(201902051006);青岛科技大学教学研究重点项目

Determination of Fluoride Content in Tea Leaves and Tea Water by Ion-Selective Electrode Method

Xiaoyan Wang, Dongmei Dai, Runze Liu, Hongkai Bu, Yanjie Wang, Huiping Li, Minghua Li, Hongtao Gao()   

  • Received:2021-11-14 Accepted:2021-11-22 Published:2022-04-02
  • Contact: Hongtao Gao E-mail:gaohtao@qust.edu.cn

摘要:

将经典基础化学实验“离子选择性电极法测定水中微量的氟”实验改进为“离子选择性电极法测定茶叶及茶水中的氟含量”。实验内容由自来水中氟含量测定,拓展到茶叶及茶水氟含量、茶叶氟浸出率的测定;并增加了茶水比、冲泡温度、冲泡时间、冲泡次数、茶叶粒度对茶叶氟浸出率的影响等研究性内容;五大代表性茶样氟含量的测定结果表明,饮用黑茶有氟摄入过量的风险;此外,在离子选择性电极法测氟的应用领域及微量氟的其他检测方法等方面将该实验进一步拓展和延伸。研究性内容的引入及分组实验更有利于培养学生的科研思维和团结协作精神;探索性且具挑战力的实验内容,提高了学生的创新能力及解决实际问题的能力;茶与健康通识内容的渗透,贴近生活,增强了学生的健康意识。本实验内容丰富,趣味性强,易于操作及推广,适合在本科低年级学生中开设。

关键词: 经典实验改进, 离子选择性电极法, 茶, 氟含量, 创新人才培养

Abstract:

The classical basic chemistry experiment "determination of micro-quantitative fluorine in water with ion-selective electrode method" was improved to "determination of fluorine content in tea and tea water with ion-selective electrode method". The experimental contents for the "determination of fluorine in tap water" were extended to the "determination of fluorine in tea and tea water, fluorine leaching rate of tea leaves." The effects of tea : water ratio, temperature, brewing time, and tea powder size on the fluorine leaching rate of tea leaves were also investigated. The fluoride content in five kinds of representative tea samples showed that drinking dark tea caused the risk of excessive fluoride intake. In addition, the experiment was further expanded and extended to the ion selective electrode method and other detection methods of trace fluoride. The introduction of research content and grouping experiments was more beneficial to cultivate students' scientific research thinking and spirit of unity and cooperation. Exploratory and challenging experimental contents improved students' ability to innovate and solve practical problems. The infiltration of tea and general health knowledge in students' lives, enhanced their health consciousness. This experiment was rich in content, interesting, easy to operate and promote, and thus suitable for junior undergraduates.

Key words: Improvement of classical experiment, Ion-selective electrode method, Tea, Fluorine content, Innovative talent cultivation

MSC2000: 

  • G64