G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 31/22 (2006.01) G01N 21/77 (2006.01) G01N 21/78 (2006.01)
Patent
CA 2487741
A method of speedily measuring the formaldehyde concentration of test gas with high sensitivity without suffering influences of coexisting gases; and a measuring instrument therefor. In particular, a method of measuring the formaldehyde concentration characterized in that a test gas is brought into contact with a filter wetted with a color forming agent consisting of an alkali aqueous solution of 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) so as to induce color formation, and that the formaldehyde concentration of test gas is determined on the basis of the degree of color formation; and a measuring instrument including a light emitting element (LED), a light receiving element (PIN type photodiode) and a display arranged so as to optically measure the degree of color formation.
L'invention concerne un procédé permettant de mesurer rapidement la concentration en formaldéhyde d'un gaz testé avec une sensibilité élevée et sans influences négatives de gaz coexistants, ainsi qu'un instrument de mesure connexe. L'invention concerne en particulier un procédé de mesure de la concentration en formaldéhyde caractérisé par les étapes suivantes : on fait entrer le gaz testé en contact avec un filtre mouillé avec un agent chromogène composé d'une solution aqueuse alcaline de 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT), de manière à susciter une coloration, et on mesure la concentration en formaldéhyde du gaz testé à partir du degré coloration résultant. L'invention concerne également un instrument de mesure comprenant un élément luminescent (DEL), un élément récepteur de lumière (photodiode PIN) et un afficheur conçu pour mesurer optiquement le degré de coloration.
Hashiba Tomohiko
Kawamura Koji
Bio Media Co. Ltd.
Hashiba Tomohiko
Kawamura Koji
Mckay-Carey & Company
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