Build Your Own Photometer: A Guided-Inquiry Experiment To Introduce Analytical Instrumentation
Build Your Own Photometer: A Guided-Inquiry Experiment To Introduce Analytical Instrumentation
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DOI：
10.1021/acs.jchemed.5b00426
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发表时间：
2016-01-01
影响因子：
3
通讯作者：
Algar, W. Russ
中科院分区：
文献类型：
--
作者：
Wang, Jessie J.;Nunez, Jose R. Rodriguez;Algar, W. Russ
介绍了一个旨在教学生在第二年水平的分光光度计仪器的基础知识的指导性调查项目。学生设计，建造，编程和测试自己的单波长，潜水光度计使用低成本的发光二极管（LED）和廉价的家居用品。一系列结构化的实验前作业指导学生通过研究背景信息，设计光度计设备，并开发自己的程序来测试设备的性能的过程。学生还通过为他们的设备编写易于使用的LabVIEW界面来学习数据采集的基本技能。使用比色指示剂染料，学生使用他们的光度计和LabVIEW界面来确定酸碱滴定的终点，并将他们的设备的线性响应与市售分光光度计的线性响应进行比较。完成实验的学生表示，这一经历提高了他们对光谱学的理解，以及他们的批判性思维能力和研究能力。
A guided-inquiry project designed to teach students the basics of spectrophotometric instrumentation at the second year level is presented. Students design, build, program, and test their own single-wavelength, submersible photometer using low-cost light-emitting diodes (LEDs) and inexpensive household items. A series of structured prelaboratory assignments guide students through the processes of researching background information, designing a photometer device, and developing their own procedure to test the performance of the device. Students also learn basic skills of data acquisition by programming an easy-to-use LabVIEW interface for their device. Using a colorimetric indicator dye, students use their photometers and LabVIEW interfaces to determine the endpoint of an acid base titration and compare the linear response of their device against that of a commercially available spectrophotometer. Students who completed the experiment indicated that the experience improved their understanding of spectroscopy, as well as their critical thinking skills and research ability.