Hemijska industrija 2012 Volume 66, Issue 1, Pages: 79-84
https://doi.org/10.2298/HEMIND110530057P
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Detection tube with composite carrier for detection of phosgene and diphosgene in air
Pitschmann Vladimír (Oritest spol s r.o., Praha, Czech Republic)
Tušarová Ivana (Oritest spol s r.o., Praha, Czech Republic)
Kobliha Zbyněk (NBC Defense Institute - University of Defense, Brno, Czech Republic)
Vetchý David (Pharmaceutical Faculty of the Veterinary and Pharmaceutical University, Brno, Czech Republic)
A new highly sensitive detection tube for measurement of concentration of
phosgene and diphosgene in air has been developed. The detection is based on
chemical reaction of 4-(p-nitrobenzyl)pyridine and N-phenylbenzylamine which
with phosgene (diphosgene) give characteristic red methine dye. As a carrier
serves spherical granules (pellets) of composite material prepared by
granulation of microcrystalline cellulose with MgO. This new indication
filling is stable, resistant to interferences and climatic influences. The
detection limit (0.05 mg.m-3) meets the requirements for conducting hygienic
checks of air quality in the workplace environment. In addition, the tube
allows a prolonged and continuous monitoring of phosgene and diphosgene in
air for at least 240 minutes.
Keywords: Detection tube, phosgene, diphosgene, 4-(p-nitrobenzyl)pyridine, composite material, microcrystalline cellulose, magnesium oxide