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Fiber Optic Sensing of Cyanides in Solutions

Published online by Cambridge University Press:  15 February 2011

S. S. Park ,
J. D. Mackenzie ,
C. Y. Li ,
P. Guerreiro  and
N. Peyghambarian
S. S. Park
Affiliation:
MSE Department, University of California, Los Angeles, CA 90095, sspark@seas.ucla.edu
J. D. Mackenzie
Affiliation:
MSE Department, University of California, Los Angeles, CA 90095, sspark@seas.ucla.edu
C. Y. Li
Affiliation:
Optical Sciences Center, University of Arizona, Tucson, AZ 85721
P. Guerreiro
Affiliation:
MSE Department, University of California, Los Angeles, CA 90095, sspark@seas.ucla.edu
N. Peyghambarian
Affiliation:
MSE Department, University of California, Los Angeles, CA 90095, sspark@seas.ucla.edu
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Abstract

A novel sol-gel technique was used to immobilize malachite green ions (MG+) in stable, optically transparent, porous silica gel films. A simple and sensitive method was developed for the detection of cyanides in solutions using spectrophotometry to measure changes caused by cyanide ions (CN−) in the absorption spectra of the green-colored silica gel films. After reaction with cyanide ions, the absorption spectra of the films changed with a typical decrease in absorbance at 620 nm. On the basis of the absorption spectra of the films, a portable and easy to use fiber optic cyanide film sensor was fabricated. Decolorization undergone by the greencolored gel films, as they were exposed to cyanide ions, was detected through a fiber. Preliminary results indicate concentrations on the order of a few ppm are detected using the fiber optic sensor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 667
Copyright
Copyright © Materials Research Society 1996

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References

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