Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/5486
Title: Formaldehyde concentration measuring system: An optoelectronic device
Authors: Singla, M L
Walia, M S
Singh, Mewa
Mahapatra, P K
Pandey, Laxmi
Shailja
Jain, S C
Keywords: Optoelectronic system
LED
Photo detector
Log amplifier
Formaldehyde
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
URI: http://hdl.handle.net/123456789/5486
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.63(12) [December 2004]

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