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Tenax TA Tube
Tenax® TA is the most popular sorbent for thermal desorption. The registered trademark "Tenax" is held by its manufacturer Buchem B.V., and "TA" means "Trapping Agent". This sorbent was originally named Tenax GC as a sorbent for packed GC columns, and some old literature still has it that way.
Air Toxics Tube
The Tube Style 2 mentioned in EPA Method TO-17 is the default configuration of the Air Toxics Tube. From a historical point of view, its functionality combines that of EPA TO- 1 and TO-2. The tube can be used independent of canisters, or in conjunction with.
TO-17 Tube Style 1
US EPA Method TO-17: “Determination of volatile organic compounds in ambient air using active sampling onto sorbent tubes” describes a TD-GC/MS based monitoring method for VOC in ambient air at 0.5 to 25 parts per billion (ppbv) concentration levels. The method is based on multi-sorbent tubes carefully selected for the suitable target compounds, and allows some flexibility in tube design to fit individual needs.
Cold trap performance is critical for modern TD-GC/MS instruments. Either working in conjunction with sorbent tubes to form a two-stage thermal desorption system, or by itself similar to the way implemented in PAMS (Photochemical Assessment Monitoring Stations), a cold trap needs to be replaced periodically to ensure repeatability.
NIOSH 2549 Tube
This method has been used for the characterization of environments containing mixtures of volatile organic compounds. NIOSH methods are more popular in workplace air quality monitoring, occupational safety and health, and indoor/building air evaluations.