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THE USE OF TEDLAR BAGS TO CONTAIN GASEOUS BENZENE SAMPLES AT SOURCE-LEVEL CONCENTRATIONS
Citation:
Knoll, J., W. Penny, AND M. Midgett. THE USE OF TEDLAR BAGS TO CONTAIN GASEOUS BENZENE SAMPLES AT SOURCE-LEVEL CONCENTRATIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-78/057 (NTIS PB291569).
Description:
Tedlar bags have been evaluated as containers for gaseous benzene samples for use in EPA Method 111 - Determination of Benzene from Stationary Sources. When such bags were used for storage, benzene samples remained essentially unchanged when held at ambient temperatures for up to 17 days, when cooled to -40C for one hour or when heated to 70C for one hour. At higher temperatures, some concentration changes were observed and above 105C decomposition of the bag seals resulted. At room temperature, there was no evidence of permeation loss and absorptive loss could only be observed upon prolonged contact. Flushing bags three times with nitrogen was sufficient to remove all traces of previous samples. Tedlar bags were also used to prepare gaseous mixtures for calibration purposes in gas chromatography. Such samples were prepared by injecting measured quantities of liquid benzene into a bag while metering-in nitrogen gas.