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 |
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| Authors | |
| Year of publication | 2021 |
| Type | Patent |
| MU Faculty or unit | |
| Publisher | |
| State | Czech Republic |
| Patent's number | 309085 |
| Web | https://isdv.upv.cz/doc/FullFiles/Patents/FullDocuments/309/309085.pdf |
| 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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