Using Potentiometric Electrodes Based on Nonselective Polymeric Membranes as Potential Universal Detectors for Ion Chromatography: Investigating an Original Research Problem from an Inquiry-Based-Learning Perspective,Journal of Chemical Education

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Using Potentiometric Electrodes Based on Nonselective Polymeric Membranes as Potential Universal Detectors for Ion Chromatography: Investigating an Original Research Problem from an Inquiry-Based-Learning Perspective
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2018-10-23 00:00:00 , DOI: 10.1021/acs.jchemed.8b00455
María Cuartero ₁ , Gastón A. Crespo ₁

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Because traditional laboratory practices in advanced chemistry education are being replaced by inquiry-based approaches, we present herein a new laboratory activity based on a small research project that was designed and executed by students. The laboratory project aims at answering a well-defined research question: how far can potentiometric electrodes based on nonselective polymeric membranes be used as universal detectors in ion chromatography (IC)? Hence, the experiments were designed and conducted to explore the analytical performances of potentiometric electrodes based on different commercial membranes that are typically used in electrodialysis. The nonselective behavior shown by the electrodes permits a critical evaluation of their further implementation as a universal detector of anions in regular IC. Thus, the students were able to integrate a nonselective potentiometric sensor to analyze several anions in flow mode, mimicking the signal that is to be obtained using such electrodes as an IC detector. The proposed practice covers different pedagogical purposes: (i) to develop competence toward “thinking like a scientist” through reflective teaching; (ii) to promote argumentation skills and critical decision making; (iii) to improve students’ research-planning and experimental-design skills; (iv) to refresh conceptual knowledge about analytical detectors, which typically goes unnoticed in laboratory practices; and (v) to reinforce students’ knowledge about the basis of potentiometry. Furthermore, the present document may serve as an easy guide to develop other laboratory practices based on potentiometric sensors.

中文翻译：

使用基于非选择性聚合物膜的电位电极作为离子色谱的潜在通用检测器：从基于询问的学习角度研究原始研究问题

由于高级化学教育中的传统实验室实践已被基于查询的方法所代替，因此我们在此介绍一项基于学生设计和执行的小型研究项目的新实验室活动。该实验室项目旨在回答一个明确定义的研究问题：基于非选择性聚合物膜的电位电极可以用作离子色谱仪（IC）的通用检测器吗？因此，设计并进行了实验，以探索基于电渗析中通常使用的不同商品膜的电位电极的分析性能。电极显示的非选择性行为允许对其作为常规IC中的阴离子通用检测器的进一步实施进行严格的评估。因此，学生们能够集成一个非选择性电位传感器来分析流动模式下的几种阴离子，从而模拟了使用诸如IC检测器之类的电极获得的信号。拟议的实践涵盖了不同的教学目的：（i）通过反思性教学发展“像科学家一样思考”的能力；（ii）提高论证能力和关键决策能力；（iii）提高学生的研究计划和实验设计技巧；（iv）刷新关于分析检测器的概念性知识，这在实验室实践中通常是不为人所知的；（v）加强学生对电位计基础的认识。此外，本文件可以作为开发基于电位传感器的其他实验室实践的简便指南。

更新日期：2018-10-23

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