Publication details

Způsob přípravy indikační náplně do detekčních trubiček k detekci fosgenu a difosgenu

Title in English Method of preparing an indicator cartridge for detection tubes for detecting phosgene and diphosgene


Year of publication 2021
Type Patent
MU Faculty or unit

Faculty of Pharmacy

State Czech Republic
Patent's number 309085
Description The solution is a method of preparing an indicator cartridge for filling into detection tubes to detect phosgene and diphosgene in the air, based on the reaction of phosgene / diphosgene with o-phenylenediamine-pyronine to form a red reaction product which arises almost immediately, but no later than within 30 seconds, and is organoleptically visible for at least 180 minutes, the mixture contains a water-insoluble sorbent, or a mixture of at least two water-insoluble sorbents, with a total concentration of 60 to 95% by weight, and containing 5 to 40% by weight of a pore-forming, easily subliming substance, formed into pellets of 0.1 to 3.0 mm in diameter, preferably 0.8 to 1.25 mm; subsequently, the spherical particles in the form of pellets are dried at 20 to 150 ° C for a time allowing sublimation of the pore-forming, easily subliming substances, except for the residual concentration of the pore-forming easily subliming substance in the pellets of 0.1 to 5% by weight, thereby forming pores in the pellets, and subsequently the dried pellets are impregnated with o-phenylenediamine-pyronine in 0.1 to 1.0 g per 100 g of pellets.
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