Colorimetric detector for formaldehyde vapor

Details Colorimetric detector for formaldehyde vapor Colorimetric detector for formaldehyde vapor

1983-02-28

1985-04-16

Turk, Arnold

Chemistry: analytical and immunological testing

Oxygen containing

Carbonyl, ether, aldehyde or ketone containing

422 56, 422 57, 427162, 436166, 548263, G01N 2178

Patent

active

045116580

ABSTRACT:
A sensitive colorimetric detector for formaldehyde vapor is prepared by applying a ketone solution of 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) to a support coated with a stable metal bicarbonate to form a compound from which the ketone can be displaced by formaldehyde to yield a chromogen developing a purple color proportional to the amount of formaldehyde. The detector is sensitive to gaseous formaldehyde in air at concentrations below 2 ppm.

REFERENCES:
patent: 3645696 (1972-02-01), Iannacone et al.
patent: 4438206 (1984-03-01), Nakajima et al.
patent: 4471055 (1984-09-01), Opp
Dickinso et al., "A New Sensitive and Specific Test for the Detection of Aldehydes: Formation of 6-Mercapto-3-Substituted-5-Triazalo[4,3,-b]-5-Tetrazines", Chemical Communications, 1719-1720 (1970).
Kurzer et al., "Chemistry of Biureas-I", Tetrahedron, 33 (15), 1999-2006 (1977).

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