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Thermal Desorption Sorbent Tubes
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Thermal Desorption
SKC sorbent technology research has produced superior materials
for the collection of organic compounds for thermal desorption. Thermal
desorption
techniques offer the advantage of greatly improved analytical sensitivity.
Because a solvent is not used, the collected sample is not diluted
and, in most cases, analytical recovery is so close to 100% that
desorption efficiency corrections are not required.
Sorbents
To be suitable for thermal desorption, sorbents must meet exacting
specifications that include:
Anasorb® 747 (20/40 mesh size and 980 m2/gm surface area)
This beaded active carbon has the capacity for organic vapors similar
to petroleum-based and coconut-shell charcoals. It also can be used to
sample nonpolar organic compounds.
Anasorb GCB1 (20/40 mesh size and 100 m2/gm surface area)
Anasorb Graphitized Carbon Black 1 (GCB1) has a moderate surface
area and is equivalent to Carbotrap ® B (20/40) and Carbopack B (60/80).
This sorbent has proven to be valuable for sampling compounds of
intermediate to high volatility.
Anasorb GCB2 (20/40 mesh size and 10 m2/gm surface area)
This sorbent has a low surface area and is equivalent to Carbotrap C
(20/40) and Carbopack C (60/80). Anasorb GCB2 is useful in collecting
semi-volatile organic compounds (SVOCs).
Carbosieve S-III (60/80 mesh size and 975 m2/gm surface area)
This carbon-based molecular sieve has properties similar to the obsolete
Anasorb CMS and replaces it in SKC thermal desorption tubes. Carbosieve
S-III has a high capacity/breakthrough volume for small molecules and is
moderately hydrophilic. It can be used for the lower boiling compounds
such as halogenated hydrocarbons and alcohols.
Chromosorb® 106 (60/80 mesh size and 700 to 800 m2/gm surface area)
A porous polymer sorbent, Chromosorb 106 is used to trap low-boiling
hydrocarbons, benzene, labile compounds, and volatile oxygenated
compounds. This hydrophobic sorbent is the least polar polymer in the
Chromosorb family and is functionally similar to Anasorb 727.
Tenax® TA (20/35 or 35/60 mesh size and 30 to 35 m2/gm surface area)
Tenax TA is a traditional sorbent (porous polymer) for trapping medium
to high boiling compounds; it is especially useful for low concentrations
because of its low background. Tenax TA is hydrophobic and is suitable
for use in EPA Method TO-17 or IP-1B and other thermal desorption applications.
Tenax GR (20/35 mesh size and 35 m2/gm surface area)
This Tenax/graphite composite extends the range of Tenax to lower
boiling compounds. It retains the ability of Tenax to be cleaned easily
to a very low background and is widely used in thermal desorption
applications.
Carbograph 5TD (20/40 mesh size and 560 m2/gm surface
area)
This is a medium strength sorbent for collecting hydrocarbons in
the boiling point range of 50 to 150 C. It is hydrophobic and has
low artifact formation.
Thermal Desorption Tube Selection
All
SKC thermal desorption tubes are sealed with PTFE end caps and
marked with a permanent serial number. When ordered, SKC thermal
desorption tubes receive extensive thermal conditioning that remains
valid for 30 days. Glass transport tubes and Swagelok® fittings
are available as accessory items.
| Applications | Sorbent |
Sorbent Amount |
SS or Glass |
Qty |
Cat. No. |
| ASTM D6196 | Anasorb GCB1† | 400 mg (60 mm) |
SS |
ea |
|
| 270 mg | G |
ea |
|||
ASTM D6196, |
Tenax TA | 250 mg (60 mm) |
SS |
ea |
|
| 250 mg | G |
ea |
|||
ASTM D6196, |
Chromosorb 106 | 350 mg (60 mm) |
SS |
ea |
|
| 220 mg | G |
ea |
|||
| EPA TO-1, IP-1B | Tenax TA | 100 mg (35/60 Mesh) |
SS |
ea |
|
| 100 mg | G |
ea |
|||
| EPA TO-2 | Carbosieve S-III | 100 mg | SS |
ea |
|
| EPA TO-17 | Anasorb GCB1†/Carbosieve S-III | 165/280 mg | SS |
ea |
|
| 80/175 mg | G |
ea |
|||
| EPA TO-17 | Anasorb GCB2/Anasorb GCB1*/Carbosieve S-III | 210/140/165 mg | SS |
ea |
|
| 125/120/105 mg | G |
ea |
|||
| EPA TO-17 | Tenax GR/Anasorb GCB1† | 175 mg/150 mg (25 mm/30 mm) |
SS
|
ea
|
|
| 125 mg/120 mg |
G
|
ea
|
|||
| — | Carbograph 5TD |
450 mg |
SS |
ea |
Table Notes
| Accessories | Qty. |
Cat. No. |
| Glass Transport Tubes, for 3.5-inch (88.9-mm) length tubes | 5
| |
| PTFE Ferrules, set of 2 | set
| |
| Swagelok Fittings, for 0.25-inch (6.35-mm) OD tubes, set of 2 | set |
Thermal Desorption Tubes Spec. Sheet (PDF)
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