Construction of a Photometer as an Instructional Tool for Electronics and Instrumentation

• Autores: Robert L. McClain
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 91, Nº 5, 2014, págs. 747-750
• Idioma: inglés
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• Resumen

  • An introductory electronics laboratory unit for the undergraduate chemical instrumentation course is presented. In this unit, students use basic electronic components to build a functioning photometer. Students interface the photometer to a microcontroller and write an Arduino program to collect the signal, calculate the absorbance, and display the result on a liquid crystal display (LCD).

    Students use their home-built instruments to measure the concentration of hexavalent chromium in a series of standard solutions and determine the figures of merit: sensitivity, detection limit, and dynamic range of the instrument. They also used their instrument to measure the concentration of hexavalent chromium in an unknown water sample.