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SKC Passive TD Tube for Benzene

Orderable Items For compliance fenceline monitoring using EPA Method 325. May also be used for other HAPs and VOCs. See Technical Note: Sampling Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF)



  • Meets specifications of U.S. EPA 325
    • 3.5 x 0.25-inch OD (Sized for Perkin Elmer and Markes International Thermal Desorbers) stainless steel tube deactivated with SilcoNert® 2000
    • Pre-conditioned Carbopack® X or Anasorb GCB1 sorbent held between two 100-mesh stainless steel screens
    • Brass Swagelok® screw caps with PTFE ferrules
    • Diffusion cap
    • Unique identification number and bar code
    • Sampling arrow indicator

  • Benzene uptake rate of 0.67 ml/min
    • Ideal for sampling over two-week sampling periods required in EPA 325

  • Use to determine average benzene concentration in the range of 0.5 to 500 µg/m3 over a two-week periods

  • Analyze by GC-FID or GC-MS as specified in EPA 325B

  • Reusable

  • Weatherproof tube shelter available

  • Establish baseline/manage exceedances for benzene and other HAPs and VOCs. See Technical Note: Sampling 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 Benzene 0.67 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


 


SKC Passive TD Tube with callouts

The SKC Passive TD Tube for Benzene meets specifications in U.S. EPA 325 (A and B) to comply with national emissions standards for hazardous air pollutants (HAPs) from petroleum refineries and specifically a new regulation to improve fugitive emissions management. EPA 325A requires time-integrated passive sampling to monitor volatile organic compounds (VOCs) at several points at refinery boundaries in conjunction with EPA 325B for analysis by thermal desorption-gas chromatography (TD-GC). The SKC Passive TD Tube is your media solution for refinery fenceline monitoring to determine the average concentration of benzene over the method-required two-week monitoring period.

EPA Method 325
EPA 325A requires refineries to deploy 12 to 24 passive samplers every two weeks to monitor benzene concentration around the fenceline of each refinery. The total number of samplers to be deployed is based on refinery size. Benzene concentration on the samplers is monitored on an annual rolling average to determine the presence of significant excess fugitive emissions. Major source petroleum refineries in the U.S. have two years after promulgation of the rule to implement a sampling protocol. SKC Passive TD Tubes can be used initially to establish a baseline to help manage exceedances and then for compliance sampling once mandatory.

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)

About SilcoNert 2000 (Siltek® /Sulfinert®)
SilcoNert 2000 is used as a coating to deactivate the stainless steel Passive TD Tube for Benzene. This process improves corrosion resistance, inertness, and hydrophobicity for better detection limits and system performance.

 

 

 




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