Plastic bags for collection of gas samples

The Contamination of Fluorocarbon-Film Bags by Hydrocarbons and Nitrogen Oxides

“…19 The permeation mechanism is dependent on a compound both dissolving into and diffusing through the film. As a historical note, nearly a decade ago Wade 20 used adsorption isotherms for Teflon to deduce that diffusion into the bulk of the polymer was occurring.…”

Industrial analytical chemists and OSHA [Occupational Safety and Health Administration] regulations for vinyl chloride

“…Gas sampling bags are commercially available and are usually fitted with a metal twist-lock valve, although some are also equipped with a permanent or replaceable septum or with a filling snout. Although the storage stabilities of a wide variety of volatile materials in these bags have been summarized in the literature (7)(8)(9)(10)(11), none of these reports has dealt with 0.2-1.0 ppm concentrations of VCM in air. Therefore, the storage stability, memory effect (from previous samples), and losses of VCM in two commercially available gas sampling bags were studied.…”

Preparation of low concentration H2 test gas mixtures in ambient air for calibration of H2 sensors

“…Storing gas samples and calibration mixtures in plastic bags (e.g. Tedlar bags) leads to even greater changes in concentration when stored for days to a few weeks (Schuette, 1967) (Barratt, 1981). Especially for hydrogen, with its exceptionally high diffusion and permeation coefficient, plastic bags are not suitable over longer periods of time.…”