Build Your Own Photometer: A Guided-Inquiry Experiment To Introduce Analytical Instrumentation
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- 作者：Jessie J. Wang ; José R. Rodríguez Nú?ez ; E. Jane Maxwell ; W. Russ Algar
- 刊名：Journal of Chemical Education
- 出版年：2016
- 出版时间：January 12, 2016
- 年：2016
- 卷：93
- 期：1
- 页码：166-171
- 全文大小：317K
- ISSN：1938-1328
文摘
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.