Diffusion Caps for Method 325 Tubes
Diffusion Caps for Method 325 Tubes Overview
Replacement caps for 226-520 tubes for Benzene monitoring with EPA Method 325. Pk/10
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)
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.
Reference
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
- Tube Type : Passive Thermal Desorption
- Sorbent : Other
- Sorbent Coating : No
- Number of Sections : 1
- Tube Material : Glass
Product Document
Operating Instructions - Passive Thermal Desorption Tubes 226-520 and 226-521 (PDF) Passive TD Tube for Benzene Spec. Sheet (PDF) Technical Note: Validated Uptake Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF)226-520 Tube for BTEX and other VOCs Laboratory Reference List