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Optical Engineering

Determination of ammonia in environmental samples using the diode laser/fiber optic colorimetric spectrometer
Author(s): SungHo Kim; Gill Sang Byun; Seongsik Hong
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Paper Abstract

To analyze aqueous ammonia, we develop a simple and inexpensive spectrometer that consisted of a diode laser, optical fibers and a photodiode detector. The concentrations of ammonia are determined by the indophenol blue method. Preliminary results on the performance of the system in terms of the stability of output intensity, linearity of a calibration curve, and the determination of ammonia in environmental samples are described. The measured concentrations are also compared with those on a conventional spectrometer. The results indicate the potential to develop a portable spectrometer useful for on-site monitoring of environmental samples. Diode lasers are favored due to the monochromatic and high intensity radiation, and the reduction of heavy and expensive components in available commercial spectrometers. For the tested on-site analyzer, a photomultiplier tube, a monochromator, and complicated optical alignments are not required.

Paper Details

Date Published: 1 July 2000
PDF: 4 pages
Opt. Eng. 39(7) doi: 10.1117/1.602584
Published in: Optical Engineering Volume 39, Issue 7
Show Author Affiliations
SungHo Kim, Soonchunhyang Univ. (South Korea)
Gill Sang Byun, Soonchunhyang Univ. (South Korea)
Seongsik Hong, Soonchunhyang Univ. (South Korea)

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