Passive Thermal Desorption Tubes

The SKC Passive Thermal Desorption tubes offer an easy and accurate way to sample low-level VOCs over extended periods of time. They meet the requirements of EPA 325A regulation for fence-line monitoring of benzene at petroleum refineries with extended sample periods of 14 days. SKC supplies sampling rates for other VOCs for other applications. A weatherproof shelter is available for protecting samplers during outdoor sampling.

Diffusive Thermal Desorption Tubes

  • Meets specification of U.S. EPA 325A and UK HSE MDHS 104
  • EPA-validated sampling rates available for benzene, toluene, ethylbenzene, xylenes and many other VOCs
  • Allows for extended sample times for low-level measurements
  • Unique identification number and bar code
  • Airflow direction and cap placement arrow indicators printed on tube
  • Reusable after laboratory conditioning
  • Ideal for establishing average airborne concentrations of additional VOCs of concern

Applications include:

  • Fenceline monitoring
  • Indoor air sampling
  • Vapour intrusion studies

The tubes are standard-sized SilcoNert 2000® deactivated Stainless Steel Thermal Desorption tubes with Swagelock fittings; when they are deployed a diffusion cap is connected to one end. The diffusion cap works the same way as a front plate on a passive badge, and has a small screen inside which also keeps out particulates/insects.  SilcoNert 2000® is used as a coating to deactivate the stainless steel EPA 325 Passive TD Tubes for Benzene. This process improves corrosion resistance, inertness, and hydrophobicity for better detection limits and system performance. Tubes are deployed inside a custom-made shelter for outdoor use, which can hold up to 4 tubes at a time, and keeps them pointing diffusion-cap downwards.

Note: All tubes are conditioned and quality control tested to assure low background

Passive Sampler Selection GuidePassive Sampler Selection Guide
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