Thermal Desorption Sample Tubes
Suitable for EPA TO-17 Sampling of VOCs
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:
- Low contaminant background
- High thermal stability
- Sufficient adsorptive strength to retain components of interest,
but release them quickly when heat is applied
Recent developments in sorbent technology have provided some superior
materials for the collection of organic compounds for thermal desorption.
Anasorb® 747 is a beaded active carbon with the
capacity for organic vapors similar to petroleum-based charcoals.
This sorbent also samples for nonpolar organic compounds.
Anasorb GCB1 (Graphitized Carbon Black) has a
moderate surface area (100 to 200 m2/gm) and is comparable
to Carbotrap® B. This sorbent has proven to be valuable for sampling
compounds of intermediate to high volatility.
Anasorb GCB2 (Graphitized Carbon Black) has a
low surface area (10 to 13 m2/gm) and is comparable to
Carbotrap® C. This sorbent has been shown to be useful for collecting
semi-volatile organic compounds.
Anasorb CMS is a traditional sorbent for trapping
low boiling compounds. It is suitable for use in EPA Method TO-2
or IP-1B and is comparable to Carbosieve® S-III.
Tenax® TA is a traditional sorbent for trapping
medium to high boiling compounds; it is especially useful for low
concentrations because of its low background. Tenax TA is suitable
for use in EPA Method TO-1 or IP-1B.
Tenax GR is a Tenax/graphite composite that extends
the range of Tenax to lower boiling compounds. It retains the ability
of Tenax to be easily cleaned to a very low background.
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.
Perkin Elmer, Shimadzu, or Unity
Thermal Desorber Tubes
Available in glass or stainless steel, these tubes measure 0.25-inch
OD x 3.5-inch length.
| Applications |
Sorbent†
Amount |
Description |
Qty. |
Cat. No. # |
| ASTM D6196 |
Anasorb GCB1
400 mg
(60 mm) |
SS, open * |
1 |
226-356 |
| Glass, open * |
1 |
226-359 |
ASTM D6196
MDHS 22, 23, 31, 40, 72 |
Tenax TA
250 mg
(60 mm) |
SS, open * |
1 |
226-357 |
| Glass, open * |
1 |
226-360 |
ASTM D6196
MDHS 72 |
Chromosorb 106
350 mg
(60 mm) |
SS, open * |
1 |
226-358 |
| Glass, open * |
1 |
226-361 |
EPA TO-1
EPA IP-1B |
Tenax TA
(35/60 Mesh)
100 mg |
SS, open |
1 |
226-340 |
| Glass, open |
1 |
226-339 |
| EPA TO-17 |
Tenax GR /Anasorb GCB1
125 mg/120 mg
(25 mm/30 mm) |
Glass, open * |
1 |
226-345 |
| EPA TO-17 |
Tenax GR / Anasorb GCB1
175 mg/150 mg
(25 mm/30 mm) |
SS, open * |
1 |
226-348 |
Thermal
Desorption Tubes Spec. Sheet (PDF)
Table Notes
| † |
Anasorb GCB1 is similar to Carbotrap® B.
Anasorb GCB2 is similar to Carbotrap C.
Anasorb CMS is similar to Carbosieve S-III.
|
| # |
Tubes are conditioned in manufacturing, if not used within
30 days, they must be reconditioned.
|
| * |
Each tube has a flow direction arrow and unique number.
|
| Note: |
EPA methods allow some flexibility accommodating similar sampling
protocols, however, such flexibility places documentation responsibility
on the user. For a detailed explanation, refer to the methods. |
| Accessories |
Qty. |
Cat. No. |
| Glass Transport Tubes, for 3.5-inch length tubes |
5
| |
| PTFE Ferrules, set of 2 |
set
| |
| Swagelok Fittings, for 0.25-inch OD tubes, set of 2 |
set |
|
Custom Tubes Available
For specific applications, SKC will manufacture custom thermal
desorption sorbent tubes to meet your specific requirements. Download
the Custom
Sorbent Tube Order Form in PDF format. Complete the form and fax
it to your SKC representative,
contact your SKC
representative, or call the SKC Sales Department at 724-941-9701
for more information.
Custom
Sorbent Tubes for Thermal Desorption Order Forms (PDF)
Thermal
Desorption Tubes Spec. Sheet (PDF)
This page was last modified August 3, 2010
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