Encapsulated sorbent tube
An encapsulated sorbent tube includes a sampling sorbent tube having an open end and containing a sorbent material therein enclosed within an independent encapsulation element that has a body portion and an end portion. The body portion of the encapsulation element has an inner diameter greater than the outer diameter of the sampling sorbent tube sufficient to accommodate the sampling sorbent tube therein. The end portion of the encapsulation element is formed and defined by the longitudinal length of the encapsulation element in excess of the sampling sorbent tube, and includes a proximal frangible element and a distal closure seal, each being independent of and separated from the sampling sorbent tube.
1. An encapsulated sorbent tube for sampling of air and gases comprising
a removable sampling sorbent tube containing a solid adsorbent material disposed therein for collection adsorbing of volatilized chemicals from a gas stream or air, said sampling sorbent tube remaining in an unbroken condition prior to and during such collection and a contiguous encapsulation tube separate from and independent of said sorbent sampling tube having a body portion and an end portion to encapsulate and protect said sampling sorbent tube in said unbroken condition prior to its use for said collection,
said body portion of said encapsulation tube having an inner diameter greater than the outer diameter of said sampling sorbent tube sufficient to encompass and accommodate said sampling sorbent tube therein,
said encapsulation tube having a longitudinal length in excess of and extending from said sampling sorbent tube, such excess and extending length in part forming a first condition of said end portion of said encapsulation tube wherein said end portion is intact,
said end portion of said encapsulation tube having a proximal score and a distal closure seal, said proximal score being located circumferentially upon said excess and extending length at a point of said end portion not in immediate adjacent proximity with said sampling sorbent tube and prior to said distal closure seal and said proximal score having a depth adapted for a circumferential breakage of said end portion of said encapsulation tube substantially perpendicular to the central longitudinal axis of said encapsulation tube at a point extending beyond and not in immediate adjacent proximity with said sampling sorbent tube and prior to said distal closure seal that defines a second condition of said end portion wherein said end portion is fractured to permit removal of said sampling sorbent tube in said unbroken condition.
2. The encapsulated sorbent tube of claim 1 wherein said encapsulation tube forms a complete integral continuous envelope to contain said sampling sorbent tube therein.
3. The encapsulated sorbent tube of claim 1 wherein said proximal score of said end portion comprises a circumferential score, a thinned wall portion, a stretched wall portion, or a groove of said end portion.
4. The encapsulated sorbent tube of claim 1 wherein said encapsulation tube is a glass envelope.
5. The encapsulated sorbent tube of claim 1 wherein said solid adsorbent material comprises a plurality of different adsorbents.
6. The encapsulated sorbent tube of claim 1 wherein said solid adsorbent material is in particulate form.
7. The encapsulated sorbent tube of claim 6 wherein said solid adsorbent material is in particulate form at a size range of 20/60 mesh.