Performance of permeation tubes as standard gas sources.
Saltzman BE; Burg WR; Ramaswamy G
Environ Sci Technol 1971 Nov; 5(11):1121-1128
Important factors affecting the accuracy of permeation tubes for nitrogen-dioxide (10102440), propane (74986), butene-1, and butane (106978) were studied. Two new methods of sealing the tube ends were developed. Lifetimes of tubes were greatly extended by attaching to one end a glass or stainless steel bottle. Systems for their storage, calibration, and use were improved. Propane tubes required some aging at 30 degrees centigrade before reproducible rates in the 20 to 30 degrees centigrade range could be achieved. Humidity seriously affected the permeation rates of nitrogen-dioxide tubes; even the past history of exposure was important. A convenient method for volumetric in situ calibration in the working flow dilution system was developed for rapid and precise results. Tubes for nitrogen-dioxide were not reliable as precision primary standard gas sources, unless recently calibrated.
NIOSH-Publication; NIOSH-Grant; Grants-other; Toxic-gases; Nitrogen-oxides; Aliphatic-hydrocarbons; Hydrocarbons; Measurement-methods; Air-quality-measurement; Penetration; Impregnation; Methodology
Environmental Health Kettering Laboratory College of Medicine Cincinnati, Ohio 45219
10102-44-0; 74-98-6; 106-97-8
Other Occupational Concerns; Grants-other
Environmental Science and Technology
University of Cincinnati, Cincinnati, Ohio