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Need help selecting a method and media? See SKC Sampling Guides:
SKC Environmental Air Sampling Guide SKC Guide to OSHA/NIOSH/ASTM Air Sampling Methods SKC Passive Sampling Guide SKC HSE Sampling Guide Need help with hazard assessment for various industries and health concerns? See SKC Sampling Solutions Need help setting up your sampling media for calibration and collection? See SKC Sample Setup Guides Need comprehensive review of air sampling topics? See SKC Presentations: Webinars Presentations Videos
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![]() | For continuous monitoring of benzene at refinery fenceline locations using EPA Method 325. May be used also for other VOCs of concern, including HAPs. See Technical Note: Validated Uptake Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF) |
SKC Passive Thermal Desorption Tube Applications
Performance Profile
Sorbent | Carbopack X, Anasorb GCB1 (see Reference) |
Tube Material | Stainless steel coated with SilcoNert 2000, sealed with brass Swagelok screw caps fitted with PTFE ferrules |
Uptake Rate | Carbopack X: Benzene 0.67 ml/min Anasorb GCB1: Benzene 0.63 ml/min |
Dimensions | 3.5 x 0.25-inch OD (Sized for Perkin Elmer and Markes International Thermal Desorbers) |
Analysis | GC-FID or GC-MS (EPA 325B) |
Note: All tubes are conditioned and quality control tested to assure low background.
McClenny, W.A. et al., “24 h Diffusive Sampling of Toxic VOCs in Air onto Carbopack X Solid Adsorbent Followed by Thermal Desorption/GC/MS Analysis–Laboratory Studies,” J. Environ. Monit., Vol. 7, Issue 3, 2005, pp. 248-256
Technical Note: Sampling Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF)
Federal Register, Vol. 80, No. 230, 40 CFR Parts 60 and 63, www.gpo.gov/fdsys/pkg/FR-2015-12-01/pdf/2015-26486.pdf
EPA Method 325A, Volatile Organic Compounds from Fugitive and Area Sources, (sampling), https://www3.epa.gov/ttn/emc/promgate/m-325a.pdf
EPA Method 325B, Volatile Organic Compounds from Fugitive and Area Sources, (analysis), https://www3.epa.gov/ttn/emc/promgate/m-325b.pdf
‡ | While benzene is a primary target compound of EPA 325, the method can be used to screen average airborne concentrations of additional fenceline VOCs (including other HAPs). See Technical Note: Sampling Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF) |