Detection tube with composite carrier for detection of phosgene and diphosgene in air

作者：Pitschmann Vladimir; Tusarova Ivana^*; Kobliha Zbynek; Vetchy David

来源：Hemijska Industrija, 2012, 66(1): 79-84.

DOI：10.2298/HEMIND110530057P

• detection tube
• diphosgene
• 4-(p-nitrobenzyl)pyridine
• composite material
• microcrystalline cellulose
• magnesium oxide

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 a characteristic red methine dye. Spherical granules (pellets) of composite material prepared by granulation of microcrystalline cellulose with MgO serve as a carrier. 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 min.

• 出版日期2012-2