Method 0030/5041A/8260B

Volatile Organic Compounds from Paired Tenax/Tenax-Charcoal Tubes (VOST)


These methods describe the sampling (0030), desorption (5041A) and analysis (8260B) of volatile POHCs (principal organic hazardous constituents) collected from stack gas effluents of hazardous waste incinerators using  volatile organic sampling train (VOST) methodology.  Samples are analyzed by thermal desorption of the sorbent tubes followed by GC/MS analysis.  This method is specifically referenced for the determination of destruction and removal efficiencies (DRE) of 99.99% for volatile POHCs.  Volatile POHCs are loosely defined as those compounds with boiling points less than 100°C.  If a compound's boiling point is less than 30°C then the POCH may breakthrough the sorbent tubes during sample collection.  Compounds with boiling points above 100°C can be efficiently collected and analyzed using these methods.  Method 5041A states that compounds with boiling points above 120°C  are not to be used for DRE determination.

Samples are collected using a VOST sampling train consisting of a probe, water cooled condensers, Tenax®/Tenax®-charcoal sorbent tubes, an empty impinger for condensate collection, and a silica gel drying tube.  Isokinetic conditions are not required for sample collection since the compounds of interest are in the vapor phase at the point of sample collection.  20L is the recommended sampling volume for collection and there are two recommended sampling rates referred to as FAST-VOST and SLO-VOST.  The sampling rate is 1 L/min. by the FAST-VOST method and 0.25 L/min. for 20 min. or 0.5 L/min. for 40 min. for the SLO-VOST method.  The goal of either method is to collect a total number of sorbent tube sets to encompass a total sampling time of 2 hours (one ‘run’): i.e., if a sampling rate of 1L/min for 20 minutes is used, a total of six sorbent tube sets will be collected in 2 hours of sampling.

When sampling for a compliance project, 3 runs as described above are collected and the Tenax® and Tenax®-charcoal tubes are analyzed separately to check for breakthrough.  Breakthrough is defined as recovering less than 30% of the POCH on the Tenax®-charcoal (back-half) tube as was found on the Tenax® (front-half) tube if greater than 75 ng is detected on the Tenax®-charcoal tube.  Analysis of the condensate collected in the empty impinger of the sampling train is also typically required for compliance projects.   In non-compliance projects, the Tenax® and Tenax®-charcoal tubes are usually analyzed in tandem and the condensates are archived.

The method also requires the collection and analysis of a field blank and trip blank per sampling event.  A trip blank consisting of a single pair of Tenax® and Tenax®-charcoal tubes from the same lot number and kept under the same conditions from the time the tubes leave the laboratory until they return to check for contamination from shipping and handling.

High moisture sources may cause problems with the analyses as the moisture will dampen the Tenax sorbent.  It is difficult to purge the POHCs from wet Tenax resulting in poor desorption efficiencies.

 

NOTE: SW-846 Method 5040 has been replaced by SW-846 Method 5041A, and SW-846 Method 8240 has been replaced by SW-846 Method 8260B.

 


(EPA SW-846)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   14 days from sampling to analysis
Preservatives:   Samples kept on ice for holding and transport to the laboratory and then kept at 4C until analysis.
Required Preps:   Tenax and Tenax/charcoal resin tube pairs
Collection Method:   VOST sampling train following SW-846 Method 0030 procedures.
Analytical Methodology:   thermal desorption GC/MS (low resolution) by SW-846 Method 8260B
Documentation:   0030
5041A
8260B

Analyte List*

Analyte Formula CAS Number Detection Limit
Ethylbenzene
C8H10
100-41-4
0.1
 g total catch weight
Styrene
C8H8
100-42-5
0.1
 g total catch weight
cis-1,3-Dichloropropene
C3H4Cl2
10061-01-5
0.1
 g total catch weight
trans-1,3-Dichloropropene
C3H4Cl2
10061-02-6
0.1
 g total catch weight
p-Xylene
C8H10
106-42-3
0.1
 g total catch weight
1,2-Dichloroethane
C2H4Cl2
107-06-2
0.1
 g total catch weight
Acrylonitrile
C3H3N
107-13-1
0.1
 g total catch weight
m-Xylene
C8H10
108-38-3
0.1
 g total catch weight
Toluene
C7H8
108-88-3
0.1
 g total catch weight
Chlorobenzene
C6H5Cl
108-90-7
0.1
 g total catch weight
Chlorodibromomethane
CHBr2Cl
124-48-1
0.1
 g total catch weight
Tetrachloroethene
C2Cl4
127-18-4
0.1
 g total catch weight
trans-1,2-Dichloroethene
C2H2Cl2
156-60-5
0.1
 g total catch weight
Carbon tetrachloride
CCl4
56-23-5
0.1
 g total catch weight
1,1,1,2-Tetrachloroethane
C2H2Cl4
630-20-6
0.1
 g total catch weight
Acetone
C3H6O
67-64-1
0.1
 g total catch weight
Chloroform
CHCl3
67-66-3
0.1
 g total catch weight
Benzene
C6H6
71-43-2
0.1
 g total catch weight
1,1,1-Trichloroethane
C2H3Cl3
71-55-6
0.1
 g total catch weight
Bromomethane
CH3Br
74-83-9
0.1
 g total catch weight
Chloromethane (Methyl chloride)
CH3Cl
74-87-3
0.1
 g total catch weight
Methyl iodide
CH3I
74-88-4
0.1
 g total catch weight
Dibromomethane
CH2Br2
74-95-3
0.1
 g total catch weight
Bromochloromethane
CH2BrCl
74-97-5
0.1
 g total catch weight
Chloroethane
C2H5Cl
75-00-3
0.1
 g total catch weight
Vinyl chloride
C2H3Cl
75-01-4
0.1
 g total catch weight
Methylene chloride
CH2Cl2
75-09-2
0.1
 g total catch weight
Carbon disulfide
CS2
75-15-0
0.1
 g total catch weight
Bromoform
CHBr3
75-25-2
0.1
 g total catch weight
Bromodichloromethane
CHBrCl2
75-27-4
0.1
 g total catch weight
1,1-Dichloroethane
C2H4Cl2
75-34-3
0.1
 g total catch weight
1,1-Dichloroethene
C2H2Cl2
75-35-4
0.1
 g total catch weight
Trichlorofluoromethane
CCl3F
75-69-4
0.1
 g total catch weight
1,2-Dichloropropane
C3H6Cl2
78-87-5
0.1
 g total catch weight
1,1,2-Trichloroethane
C2H3Cl3
79-00-5
0.1
 g total catch weight
Trichloroethene
C2HCl3
79-01-6
0.1
 g total catch weight
1,1,2,2-Tetrachloroethane
C2H2Cl4
79-34-5
0.1
 g total catch weight
o-Xylene
C8H10
95-47-6
0.1
 g total catch weight
1,2,3-Trichloropropane
C3H5Cl3
96-18-4
0.1
 g total catch weight

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.