Testing tube for measuring chromate and chromic acid aerosols in

Details Testing tube for measuring chromate and chromic acid aerosols in Testing tube for measuring chromate and chromic acid aerosols in

1980-02-29

1981-06-09

Smith, William F.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

422 60, 422 61, 422 86, 422101, 23232R, F01B 2300, B63H 100, G01N 2762

Patent

active

042724791

ABSTRACT:
A method of testing air for measuring the chromate and chromic acid aerosols therein, comprises, passing the air through a testing tube after each end of the tube has been broken to cause the particles in the air to become entrained on a filter in the tube and, thereafter, breaking an ampoule of sulfuric acid in the tube so that it flows through the filter and dissolves the entrained particles and brings them into contact with a filling material which is also arranged in the tube and which produces a reaction with the particles of chromate and chromic acid which are deposited on the filter. The reaction produces a violet dye, the intensity of the discoloration being directly proportional to the mass of the deposited chromate or chromic acid. The testing tube comprises a closed testing tube having breakoff ends at each end with holders for positioning an ampoule of sulfuric acid upstream in respect to the direction of testing air flowing through the tube of a filling material which includes a granular reagent layer of an earth quartz and diphenyl carbazide, together with a sorption-active silica gel and a subsequent layer of granular quartz.

REFERENCES:
patent: 2487077 (1949-11-01), Shepherd
patent: 2908555 (1959-10-01), Grosskopf
patent: 3022141 (1962-02-01), Grosskopf
Furman, H. N., et al., Standard Methods of Chemical Analysis, 6th Edition, D. Van Nostrand Co., Inc., New York, 1966, pp. 350-351.

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