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Development of Air-Sampling Techniques, LASL Project R-059, NIOSH-IA- 74-10, October 1, 1974 - March 31, 1975.

Campbell-EE; Wood-GO; Anderson-RG
Los Alamos Scientific Laboratory of the University of California, Los Alamos, New Mexico, 1975 Sep:18 pages
The use of a glass tube containing silica gel in air sampling of methylamine (74895), ethylamine (75047), dimethylamine (124403), isopropylamine (75310), butylamine (109739), diethylamine (109897), triethylamine (121448), and diisopropylamine (108189) was tested. A similar method using a glass tube with sulfuric-acid coated silica gel for air sampling of hydrazine (302012), methylhydrazine (60344), and 1,1-dimethylhydrazine was also tested. For aliphatic amines, a Pyrex glass tube with internal diameter of 4 millimeters was prepared with three sections of 45 to 60 mesh silica gel; one section was 600 milligrams, the other two were 150 milligrams each. For hydrazines an identical glass tube was used, with two sections of 100 milligrams and 50 milligrams, respectively, of concentrated sulfuric-acid coated on 45 to 60 mesh silica gel. Butylamine, diethylamine, and triethylamine vapors were sampled using a Pyrex glass tube of 8 millimeter internal diameter, divided into five 150 milligram sections of silica gel. Air samples were pumped with a Sipin Model 2 Personal Sampler Pump, Analysis was done by gas chromatography. Desorption from the silica gel for aliphatic amines is complete by sulfuric-acid, except for triethylamine and diisopropylamine, where desorption was made greater than 80 percent by elution with sulfuric-acid. For the hydrazines desorption was made complete by elution with distilled water. The authors recommend that sampling of air vapors of the hydrazines be done using 20 percent (by weight) sulfuric-acid coated on the silica gel. Oxidation loss of the samples should be minimized by elution with distilled water as soon as possible after sampling. Storage or shipping of samples should be preceded by purging the tubes with nitrogen or helium and tightly capping them.
NIOSH-Contract; Contract-IA-74-10; Air-monitoring; Monitors; Air-sampling-equipment; Analytical-instruments; Sampling-methods; Analytical-processes; Air-sampling; Sampling-equipment;
74-89-5; 75-04-7; 124-40-3; 75-31-0; 109-73-9; 109-89-7; 121-44-8; 108-18-9; 302-01-2; 60-34-4;
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Los Alamos Scientific Laboratory of the University of California, Los Alamos, New Mexico, 18 pages, 7 references
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division