Colorimetric method for detecting aldehydes in air

Details Colorimetric method for detecting aldehydes in air Colorimetric method for detecting aldehydes in air

1982-08-30

1984-12-18

Richman, Barry S.

Chemistry: analytical and immunological testing

Oxygen containing

Carbonyl, ether, aldehyde or ketone containing

422 59, 422 86, 422 88, 436128, 436167, G01N 2178

Patent

active

044891644

ABSTRACT:
A transparent glass detection tube contains a bed of silica gel which has been impregnated with sulfuric acid. One end of the tube is open to the outside air while the other end is connected to a sampling pump. Outside air is drawn through the tube and aldehydes and moisture in the air are separated and adsorbed on sequential lengthwise portions of the gel bed. At the end of the sampling period, xylene vapors are drawn through the silica gel forming a brownish tint stain on that portion of the bed that has adsorbed aldehydes. The length of the stain is a measure of the amount of aldehydes present in the air sample, i.e. the dosage exposure to aldehydes during the sampling period.

REFERENCES:
patent: 4272479 (1981-06-01), Huneke et al.
patent: 4329153 (1982-05-01), Leichnitz
Leichnitz Detector Tube Handbook 8, 1979 pp. 80-81.
Meckbach Chemical Abstracts vol. 45 #4059i.
Huang et al., Chemical Abstracts vol. 51, #1651a.
Huang et al., Chemical Abstracts vol. 53 #15627d.

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