大学化学 >> 2021, Vol. 36 >> Issue (2): 1912074.doi: 10.3866/PKU.DXHX201912074

化学实验 上一篇    下一篇

I2与水溶性高分子显色体系的探究

刘红瑜1,*(), 原思浩3, 金谷2   

  1. 1 化学国家级实验教学示范中心(中国科学技术大学), 合肥 230026
    2 中国科学技术大学化学与材料科学学院, 合肥 230026
    3 中国科学技术大学少年班学院, 合肥 230026
  • 收稿日期:2019-12-30 录用日期:2020-01-09 发布日期:2020-02-28
  • 通讯作者: 刘红瑜 E-mail:liuhyhx@ustc.edu.cn
  • 作者简介:刘红瑜, Email: liuhyhx@ustc.edu.cn
  • 基金资助:
    2018年度中国科学技术大学本科教学研究项目(2018xjyxm12)

Study on the Colour Reaction System of Iodine and Water-Soluble Polymer

Hongyu Liu1,*(), Sihao Yuan3, Gu Jin2   

  1. 1 National Demonstration Center for Experimental Chemistry Education(University of Science and Technology of China), Hefei 230026, China
    2 School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
    3 School of the Gifted Young, University of Science and Technology of China, Hefei 230026, China
  • Received:2019-12-30 Accepted:2020-01-09 Published:2020-02-28
  • Contact: Hongyu Liu E-mail:liuhyhx@ustc.edu.cn

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摘要：

介绍了一个综合探究实验。本实验选取了淀粉和聚乙烯醇（PVA）两种水溶性高分子与I2构成显色体系，通过分光光度法，分别探究不同反应pH、反应温度、反应物浓度、反应时间等对显色结果的影响，从而确定该显色体系的最佳反应条件；进一步绘制出吸光度工作曲线，讨论了该显色体系用于物质定量测量的合理性。

关键词: 显色反应, I2, 淀粉, PVA, 定量

Abstract:

This paper introduces a comprehensive inquiry experiment. Two water-soluble polymers, starch and polyvinyl alcohol (PVA), were selected to form a color developing system with iodine. By spectrophotometry, the effects of different reaction conditions, such as pH, reaction temperature, concentration of reactants and reaction time, on the color rendering results were investigated, and the optimum reaction conditions were determined. The working curve of absorbance was constructed and the application of the color rendering system was discussed. Rationality of quantitative measurement of substances.

Key words: Color reaction, Iodine, Starch, PVA, Quantitative analysis