FAQ

When should I use solvent desorption (thermal desorption) vs. other air sampling techniques?

31 Jul 2025

Please refer to the following table for a comparison of the advantages and disadvantages of canisters, gas sampling bags, and solvent desorption tubes (thermal desorption tubes).

CanisterGas Sampling BagSolvent/Thermal Desorption Tube
Media Typewhole airwhole airadsorption
Sensitivityppt-ppbppb-ppmppb-ppm
Techniquepassive (no pump)activeactive/passive
Sample Typegrab or integratedgrab or integratedgrab or integrated
Analytewide range of VOCs & permanent gaseswide range of VOCs & permanent gasessorbent specific
Applicationsambient, IAQ, emergency response, IHambient, IAQ, emissionambient, IAQ, IH
Durabilityreusableone-time usesolvent: one-time use; thermal: reusable (performance is solvent specific)
Inertnessexcellentfairfair
Stability30 day48 hrsvaries by analyte
Sample Volume0.4–15 L0.5–100 Lvaries by analyte
Sampling Timeseconds to daysminutes to hoursminutes to hours

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GNOT4974