Development of a Low-Cost Four-Color LED Photometer
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[1] Purdue University
Purdue University
Township of Wabash, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 73, Nº 11 (November), 1996, págs. 1052-1054
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Instrumentation is becoming more important in all aspects of chemistry, from research to control of industrial processes. Due to this increasing reliance on instrumentation, students should begin working with instruments early in their training. However, the cost of having a sufficient number of instruments for this purpose is prohibitive. In an effort to reduce the rising cost of laboratory equipment used in general chemistry labs and to introduce instrumentation at the undergraduate level, we developed and tested a low-cost four-color LED photometer. This photometer resembles a Spectronic 20 in that it detects absorbance at selected wavelengths of visible light. However, the photometer retains the advantages of a dual-beam system. The cost is reduced by the elimination of all optical components, which are often the most expensive portion of spectrophotometers. Also, removal of the optical components permits the light source, sample chambers, and detectors to all be mounted in the same holder. This makes the unit very compact and easy to use in a student laboratory.
