| 摘要 |
A method of speedily measuring the formaldehyde concentration of test gas with high sensitivity without suffering influences of coexisting gases; and a measuring instrument therefore. 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.
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