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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

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