Undergraduate Laboratory Project Comparing Two Analytical Techniques for Ascorbic Acid Determination

Undergraduate Laboratory Project Comparing Two Analytical Techniques for Ascorbic Acid Determination
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比较两种抗坏血酸测定分析技术的本科实验室项目

DOI:
10.1021/acs.jchemed.2c00224
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发表时间:
2022
影响因子:
3
通讯作者:
Laskin, Julia
Laskin, Julia
中科院分区:
化学2区
文献类型:
--
作者:
Samayoa-Oviedo, Hugo Y.;Laskin, Julia

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我们描述了一个项目中实施的荣誉部分的上层分析化学本科课程,学生设计了一个实验来比较两种分析技术的性能,以确定抗坏血酸的量在商业样品。本项目为18名学生设计,分为三个阶段。在第一阶段,学生调查本实验室可用的分析技术的基本原理,执行类似于他们将用于数据分析的计算,并提出基于文献中报告的分析物的物理化学性质的实验程序。在项目的第二阶段,学生使用经典的碘量滴定法和他们选择的一种仪器技术进行测量:循环伏安法或分光光度法。在最后阶段,学生写一份实验报告,在其中他们总结了他们的结果,并使用适当的统计测试比较技术。在项目结束时进行的一项调查中,学生们表示,研究新的分析方法,提出自己的实验方法,并在实验室中实施,对他们的科学技能产生了积极的影响。最后,这个项目使学生能够评估每种技术在复杂样品中测定分析物的优点。
We describe a project implemented in the honors section of an upper-level analytical chemistry undergraduate course, in which students designed an experiment to compare the performance of two analytical techniques to determine the amount of ascorbic acid in a commercial sample. This project designed for 18 students is composed of three stages. In the first stage, students investigate the fundamentals of the analytical techniques available for this lab, perform calculations similar to the ones they will use for data analysis, and propose an experimental procedure based on the physicochemical properties of the analyte reported in the literature. In the second stage of the project, students perform the measurements using a classical iodometric titration and one instrumental technique of their choice: cyclic voltammetry or spectrophotometry. In the final stage, students write a lab report in which they summarize their results and compare the techniques using appropriate statistical tests. In a survey conducted at the end of the project, students stated that investigating new analytical approaches, suggesting their own experimental approach, and implementing it in the lab had a positive impact on their scientific skills. Finally, this project enabled students to evaluate the merits of each technique for the determination of an analyte in a complex sample.
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