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Title: Formaldehyde concentration measuring system: An optoelectronic device
Authors: Singla, M L
Walia, M S
Singh, Mewa
Mahapatra, P K
Pandey, Laxmi
Jain, S C
Keywords: Optoelectronic system
Photo detector
Log amplifier
Issue Date: Dec-2004
Publisher: CSIR
Series/Report no.: Int.Cl.7: G 01 N 21/27
Abstract: The paper describes development of an optoelectronics system, which involves the use of ultra-bright yellow LED (λ, 583nm) as light source. BPW21 photodiode (relative spectral sensitivity, < 90 %, 500–600nm) is used as detector for measurement of formaldehyde concentration. The system is based on the reaction of formaldehyde with chromotropic acid in acidic medium. Violet colour, produced after the reaction, is used to measure the concentration (0.5 - 10 ±0.02 ppm) in water.
Description: 989-991
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.63(12) [December 2004]

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