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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > March  >
In the Laboratory
Application of Light Emitting Diodes to Chemical Analysis: Determination of Copper in Water
Juan D. Mozo
Departamento de Ingeniería Química, Química Física y Química Orgánica, Escuela Politécnica Superior, Universidad de Huelva, 21819 Palos de la Fra. Huelva, Spain

Manuel Galan and Emilio Roldán
Departamento de Química Física, Universidad de Sevilla, c/ Garcia González s/n, E-41012 Sevilla, Spain

Cover
March 2001
Vol. 78 No. 3
p. 355
Abstract
In this paper a photometer based on a light emitting diode (LED) is described. The apparatus is very simple and easy to build. The light source is a 5-mm LED, which can be replaced in order to select the emission wavelength. A fiber optic is used to conduct light from the LED to the sample. An inexpensive solid-state light-to-voltage optical sensor is used as detector. Using a yellow LED (peak emission = 595 nm), copper(II) in the mg L-1 range can be accurately analyzed. Errors due to the non-monochromatic emission of the LED are also analyzed on the basis of Beer law deviations. For this purpose, emission and absorption bands are modeled by Gaussian curves.
Supplement
Instructions for sample preparation and several numerical simulations are available.
*  Contents JCE2001p0355W.doc (MS Word)
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*  Citation
 Mozo, Juan D.; Galán, Manuel; Roldán, Emilio. J. Chem. Educ. 2001 78 355.
*  Keywords
 Laboratory Equipment / Apparatus; Metals; Quantitative Analysis; Undergraduate Research
*  History
 Created:
Last Updated:		 February 6, 2001
August 31, 2005
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