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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > November  >
In the Laboratory
Development of a Low-Cost Four-Color LED Photometer
Jay R. Hamilton, Jeffrey S. White, and Mary B. Nakhleh
Purdue University, West Lafayette, IN 47907-1393
Cover
November 1996
Vol. 73 No. 11
p. 1052
Abstract
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.
More Information
*  Citation
 Hamilton, Jay R.; White, Jeffrey S.; Nakhleh, Mary B. J. Chem. Educ. 1996 73 1052.
*  Keywords
 Instrumental Methods
*  History
 Created:
Last Updated:		 August 5, 1999
February 21, 2006
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