Permeation Tubes as Calibrated Sources of Gas

Known low concentrations of gases are needed for toxicological studies, for calibration of instruments and for validation of analytical methods. Permeation tubes were developed as convenient sources. Liquefied gases such as sulfur dioxide, nitrogen dioxide, hydrocarbons and hydrogen sulfide are seal...

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Bibliographic Details
Main Author: Saltzman,Bernard E
Format: Report
Language:English
Subjects:
GAS FLOW
GASES
HALOCARBON PLASTICS
LIQUEFIED GASES
Test Facilities, Equipment and Methods
TEST METHODS
TETRAFLUOROETHYLENE RESINS
TOXICITY
Toxicology
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Summary:Known low concentrations of gases are needed for toxicological studies, for calibration of instruments and for validation of analytical methods. Permeation tubes were developed as convenient sources. Liquefied gases such as sulfur dioxide, nitrogen dioxide, hydrocarbons and hydrogen sulfide are sealed in Teflon tubing and permeate through the walls for long periods at relatively constant rates of a few milligrams per day. The report discusses the use of these tubes in toxicology studies. Permeation tubes have been found to be simple, convenient and relatively constant sources for periods as long as a year. Although they have been applied mainly for calibration of instruments, by appropriate modifications they should be suitable for toxicological chamber work. (Author) Presented at Annual Conference on Environmental Toxicology (1st), Fairborn, Ohio, 9-11 Sep 70, sponsored by SysteMed Corp., Dayton, Ohio.