The use of tristimulus colorimetry for the determination of hydrogen cyanide in air by a modified König method

A simple visual and tristimulus colorimetric method (threedimensional system CIE-L*a*b*) for the determination of trace amounts of hydrogen cyanide in air has been developed. The method is based on the suction of hydrogen cyanide through a chlorinating cartridge where cyanogen chloride is formed, wh...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2010-01, Vol.75 (6), p.813-822
Main Authors: Pitschmann, Vladimír, Tusarová, Ivana, Halámek, Emil, Kobliha, Zbyněk
Format: Article
Language:English
Subjects:
4-benzylpyridine
atmosphere analysis
cyanogen chloride
dimedone
hydrogen cyanide
tristimulus colorimetry
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Summary:A simple visual and tristimulus colorimetric method (threedimensional system CIE-L*a*b*) for the determination of trace amounts of hydrogen cyanide in air has been developed. The method is based on the suction of hydrogen cyanide through a chlorinating cartridge where cyanogen chloride is formed, which is further driven to an indicator disc made of a modified cotton fabric. This indicator disc is placed into an adapter. Prior to analysis, the disc is saturated with a chromogenic reagent, a solution of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) and 4-benzylpyridine in ethanol. In the presence of hydrogen cyanide (cyanogen chloride), a pink coloration emerges on the indicator disc, the intensity of which is evaluated either visually or by use of a tristimulus colorimeter. The detection limit is 0.1 mg m-3. The method is mainly suitable for mobile field analyses. It was applied for the CHP-5 chemical agent detector introduced into the equipment of the Czech Army corps.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC090521046P