|For continuous monitoring of benzene at refinery fenceline locations using EPA Method 325. May also be used for other VOCs of concern (including HAPs). See Technical Note:Valid Uptake Rates for Benzene and Other VOCs Using the SKC Passive TD Tube (PDF)|
|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.
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
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
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)|