Abstract
An expression is derived for the rate of change in gas concentration within a polymer bag caused by permeation through the walls of gases from the surrounding air. The rates of permeation of nitrogen and oxygen into such bags have been measured by gas chromatography and fitted to the theoretical expression to give an estimte of the permeation coefficients. These coefficients are compared with known values for the polymers involved. The significance of the results is discussed with regard to the purity of samples stored in gas-sampling bags.
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