| 摘要 |
<p>An envelope for the collection of atmospheric air samples for subsequent analysis. The envelope is formed of first and second opposed panels of flexible, gas impermeable material which are peripherally sealed to define a collection chamber therebetween. The envelope contains expandable means, such as a spring, movable from an original, compressed condition between the opposed panels to a subsequent, expanded condition whereby portions of the opposed panels are biased apart. A self-sealing septum is provided on the first panel for use in selectively establishing fluid communication, by means of a puncturing cannula, between the collection chamber and external atmospheric air whereby the expandable means moves from the compressed condition to an expanded condition and concurrently draws a sample of the external atmospheric air into the collection chamber. A guard plate can also be provided in the envelope between the expandable means and the second panel in a position subjacent the self-sealing septum to prevent the puncturing cannula from puncturing the second panel.</p> |
