Carbopack™ X TD Tube for Fenceline Monitoring

 Compliant with US EPA Method 325B

EPA Method 325B Compliance

Overview

The US EPA first employed Supelco's adsorbent technology beginning in 1981 with the development of the first thermal desorption tubes as an alternative to sampling volatile organic compounds with bulky canisters and less sensitive solvent desorption methods. When passive monitoring using thermal desorption tubes first began in 2003, the US EPA deployed the specially coated stainless steel thermal desorption tube packed with Carbopack X for the Detroit Exposure and Aerosol Research Study (DEARS). Recently, in 2011, when the ruling on Passive Fenceline Monitoring for Fugitive and Area Source from oil & gas emissions sources was coming into effect (EPA Draft Method 325B), the EPA relied on the same trusted product. While other manufacturers may claim "equivalent" thermal desorption tubes, there is no guarantee they provide the same quality performance. The deactivated Carbopack X SS TD tubes have been deployed in the field for the DEARS as well as EPA Draft Method 325B with passive sampling uptake rates validated[3] by the US EPA for the VOCs of interest for Fenceline Monitoring; they have over a decades history of repeated and proven performance.

The Fence Line Monitor (FLM) Carbopack X Tube meets the requirements of Method 325B for passive sampling. When passive sampling - use a diffusive endcap (sold separately) on the inlet of the tube, and maintain the outlet sealed using the brass endcap (supplied). It can also be used for active sampling. Collect the sample in the direction of the flow arrow on the tube. Typical active sampling rates are 10 to 100 mL/min with sample volumes ranging from 0.25 to 10 liters. In this application no endcaps are used.

Table of Diffusive Sampling Rates for Carbopack X Deactivated SS TD Tube³

Compound Name CAS# 75% RH Eff.
Sampling
ratea/cm3 min-1
75% RH Eff.
Uptake ratea/ng
ppmv-1 min-1
Martin et al.
ref. 3 [ref 9-11]
35% RH rate = 75%
RH Rate Times
1,2-Dichloro-1,1,2,2-tetrafluoroethane (CFC 14) 76-14-2 0.44 ± 0.08 3.12 ± 0.60   1.06
1,3-Butadiene 106-99-0 0.61 ± 0.11 1.36 ± 0.24 1.24 ± 0.16 0.88
Trichlorofluoromethane (CFC 11; Freon-11; R-11) 75-69-4 0.51 ± 0.07 2.87 ± 0.39   0.98
1,1-Dichloroethene (1,1-DCE) 75-35-4 0.57 ± 0.14 2.27 ± 0.54   0.91
3-Chloropropene 107-05-1 0.51 ± 0.30 1.61 ± 0.96   0.83
1,1,2-Trichloro-1,2,2-trifluoroethane (CFC 113; Freon-113) 76-13-1 0.46 ± 0.05 3.58 ± 0.42   0.98
1,1-Dichloroethane 75-34-3 0.57 ± 0.10 2.34 ± 0.42   1.12
cis-1,2-Dichloroethene (1,2-DCE) 156-59-2 0.58 ± 0.08 2.31 ± 0.30   0.96
1,2-Dichloroethane (DCE) 107-06-2 0.57 ± 0.08 2.34 ± 0.33   0.97
1,1,1-Trichloroethane 71-55-6 0.51 ± 0.10 2.80 ± 0.54   1.11
Benzene 71-43-2 0.67 ± 0.11 2.15 ± 0.36 1.99 ± 0.48 1.12
Carbon Tetrachloride (CCl4) 56-23-5 0.51 ± 0.06 3.24 ± 0.36   1.17
1,2-Dichloropropane 78-87-5 0.52 ± 0.10 2.41 ± 0.45   0.91
Trichloroethene (TCE) 79-01-6 0.50 ± 0.05 2.74 ± 0.30   1.07
1,1,2-Trichloroethane (1,1,2-TCA) 79-00-5 0.49 ± 0.13 2.69 ± 0.72   0.91
Toluene 108-88-3 0.52 ± 0.14 1.98 ± 0.51 2.23 ± 0.52 1.01
Tetrachloroethene (PERC) 127-18-7 0.48 ± 0.05 3.27 ± 0.36   1.01
Chlorobenzene (MCB) 108-90-7 0.51 ± 0.06 2.35 ± 0.30   0.99
Ethylbenzene 100-41-4 0.46 ± 0.07 2.03 ± 0.30   0.99
m,p-Xylene m-108-38-3;
p-106-42-3
0.46 ± 0.09 2.00 ± 0.39   0.99
Styrene 100-42-5 0.50 ± 0.14 2.12 ± 0.57   0.96
o-Xylene 95-47-6 0.46 ± 0.12 2.01 ± 0.54 1.79 ± 0.41 0.99
4-Ethyltoluene 622-96-8 0.41 ± 0.11 2.03 ± 0.57   0.93
1,3,5-Trimethylbenzene 108-67-8 0.41 ± 0.10 1.72 ± 0.42   0.96
m-Dichlorobenzene (mDCB) 541-73-1 0.44 ± 0.07 2.68 ± 0.45   0.97
p-Dichlorobenzene (pDCB) 106-46-7 0.45 ± 0.05 2.71 ± 0.30   0.97
o-Dichlorobenzene (oDCB) 95-50-1 0.45 ± 0.06 2.72 ± 0.36   0.98
a At 22 ± 2 ºC at 760 Torr. Also ± values are based on 3σ values


Quality You Can Trust
Every batch of Carbopack X is quality control tested prior to being packed into the deactivated stainless steel thermal desorption tube. And after the tubes are preconditioned, each lot is tested for benzene background levels. A certificate of analysis (COA) is included in each and every box.

About Carbopack X:
Carbopack X is graphitized carbon black with a BET Surface area of 240m2/g, and a mean pore volume of 100Å. It is one of the strongest graphitized carbons blacks (GCBs) available; its adsorptive strength bridges the gap between other graphitized carbon blacks, and a carbon molecular sieve (CMS). It is hydrophobic, so it's suitable when sampling in high humidity atmospheres. A small dry purge of 0.1 to 0.25 Liter is typically all that is required prior to analysis

About Supelcoat TD:
Supelcoat is a new proprietary deactivation process that produces a ceramic-like protective coating to the metal surface. This coating covalently bonds to the stainless steel surfaces, which masks any imperfections or active sites that could be present on the surface. This treatment creates a smooth surface, is stable to >400° C, and can withstand multiple uses (>1000 cycles).

Conditioning:
The tubes are pre-conditioned and QC tested to assure a low background of VOCs. There may be applications when a lower background is desired, or the tubes have been in storage for a long period (> 1 year assuming the brass endcaps remained on the tubes). Reconditioning the tubes for 30-60 minutes is usually sufficient for most applications. To recondition the tubes, use the conditioning mode of the thermal desorber if it has the option, or use an offline tube conditioner. Position the tubes so the inert gas enters the sampling outlets and exits through the sampling inlet (opposite the flow arrow on the tube). Heat the tubes to approximately 10-15° C above the desired desorption temperature (do not exceed the maximum temperature 400° C). During heating use high-purity, moisture-free, helium, or nitrogen at a flow rate of 30-100 mL/min.

Reconditioning:
After analysis, the tubes should be reconditioned for future use. Follow the steps listed above. Reseal the tubes with brass endcaps provided.

>View the Data Sheet for 28686-U

Featured Products

Description Pkg Cat. No.
Pre-Conditioned FLM SS TD Tube packed w/Carbopack X 10 28686-U
Diffusive Endcaps (standard) 10 28017-U
Diffusive Endcaps (w/silicone membrane for humid environments) 10 28018-U
Pre-Conditioned Swageloks® Assembly 20 23094-U
TDS³ Storage Container   1 25097-U

References

  1. Petroleum Refinery Sector Risk and Technology Review and New Source Performance Standards; Proposed Rule. Federal Register 79 (30 June 2014): 36880-37075. https://www.federalregister.gov/articles/2014/06/30/2014-12167/petroleum-refinery-sector-riskand-technology-review-and-new-source-performance-standards
  2. Brown, J.L., W.R. Betz, L.M. Sidisky, M.J. Keeler, K.D. Oliver, H.H. Jacumin Jr., E.H. Daughtrey Jr. New Carbopack X metal-passivated adsorbent tube for 24-hour diffusive sampling of 1,3-butadiene and 24 additional volatile organic compounds. Presented at PittCon 2008, New Orleans, Louisiana, March 3-6, 2008.
  3. Williams, R.W., A.F. Vette, D.A. Whitaker, C.W. Croghan, P.A. Jones, H. Daughtrey, K. Oliver, H. Jacumin, D.D. Williams, C.E. Rodes, J.W. Thornburg, J.S. Herrington, and J. Zhang. The impact of passive sampling methodologies used in the DEARS. Presented at the National Environmental Monitoring Conference (NEMC), Cambridge, MA, August 20-24, 2007.
  4. Williams, R.W., A.F. Vette, D.A. Whitaker, C.W. Croghan, P.A. Jones, E.H. Daughtrey, Jr., K.D. Oliver, H.H. Jacumin, Jr., D.D. Williams, C.E. Rodes, J.W. Thornburg, J.S. Herrington, L. Zhang, J. Tong, J. Zhang. 2006. Use of passive samplers in the DEARS. Presented at the A&WMA Symposium on Air Quality Measurement Methods and Technology, Durham, NC, May 9-11, 2006.

Publications

  1. Thoma, E.D., M.C. Miller, K.C. Chung, N.L. Parsons, B.C. Shine. 2011. Facility Fence-Line Monitoring Using Passive Samplers. J. Air Waste Manage. Assoc. 6:834-842
  2. McClenny, W.A., H.H. Jacumin, Jr., K.D. Oliver, E.H. Daughtrey, Jr., D.A. Whitaker. 2006. Comparison of 24 h averaged VOC monitoring results for residential indoor and outdoor air using Carbopack X-filled diffusive samplers and active sampling - a pilot study. J. Environ. Monit. 8:263-269.
  3. McClenny, W.A., K.D. Oliver, H.H. Jacumin, Jr., E.H. Daughtrey, Jr., D.A. Whitaker. 2005. 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. 7:248-256.
  4. McClenny, W.A., K.D. Oliver, H.H. Jacumin, Jr., E.H. Daughtrey, Jr. 2002. Ambient level volatile organic compound (VOC) monitoring using solid adsorbents - Recent U.S. EPA studies. J. Environ. Monit. 4:695-705.

Trademarks
Carbopack, FLM, Supelcoat, TDS3 - Sigma-Aldrich Biotechnology BP
PerkinElmer - PerkinElmer Corp.
Shimadzu - Shimadzu Corp.
DANI - Instruments S. P. A.
Markes - Markes International Limited
OI Analytical - OI Corporation
Cognex, DataMan - Cognex Corp.