A Four-Wavelength Channel Absorbance Detector with a Light Emitting Diode-Fiber Optics Assembly for Simplifying the Flow-Injection Analysis System

A four-channel absorbance detector was developed for simplifying the flow-injection analysis (FIA). This detector used four light-emitting-diodes (LEDs) as light sources; their wavelengths were 470, 495, 590 and 635 nm, respectively. Their amplitudes were modulated electronically with different freq...

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Bibliographic Details
Published in:Analytical Sciences 2003, Vol.19(7), pp.1025-1028
Main Authors: SUZUKI, Yasutada, HORI, Hiroyuki, IWATSUKI, Masaaki, YAMANE, Takeshi
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Chemistry
Continental surface waters
Exact sciences and technology
General, instrumentation
Injection
Light sources
Natural water pollution
Optics
Pollution
Rivers
Water treatment and pollution
Wavelengths
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Summary:A four-channel absorbance detector was developed for simplifying the flow-injection analysis (FIA). This detector used four light-emitting-diodes (LEDs) as light sources; their wavelengths were 470, 495, 590 and 635 nm, respectively. Their amplitudes were modulated electronically with different frequencies. The light emissions from them were merged by plastic-core fiber optics, and were detected by a photo-diode (PD). The mixed signal was then sent to and discriminated by a four-channel lock-in amplifier corresponding to each modulation frequency. Neither a monochromator nor an optical filter was used. This detector was conveniently applied to the determination of iron in river water by FIA using 1,10-phenanthroline. Though a noisy peristaltic pump was used to propel the solutions, practical precision and accuracy were obtained by means of on-line dual-wavelength measurements and off-line moving average calculations.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.19.1025