These methods describe the sampling (0040) and analysis (8260B) of volatile POHCs (principal organic hazardous constituents) collected from stack gas effluents from combustion sources. Samples are collected in Tedlar bags and analyzed by GC/MS. This method is suitable for volatile compounds with boiling points less than 121°C, compounds with concentrations in the stack below the condensation point (calculcated at 20°C), and compounds whose loss in Tedlar during a validation study is less than 20% over a 72 hour storage period at temperatures above 0°C. The method specifies a list of target compounds. Other compounds may be applicable for this method, however, it is required that a stability and recovery study be demonstrated if the compound is not listed as a target analyte in the method.
Samples are collected using a heated probe and filter into a Tedlar bag. Moisture and condensible components are removed from the stack gas through use of a condenser and collected in a trap. Isokinetic conditions are not required for sample collection since the compounds of interest are in the vapor phase at the point of sample collection. A 1 hour collection time at a sampling rate of 0.5 L/min. flow rate is recommended. Tedlar bags should be flushed with high purity nitrogen three times prior to using them for sampling.
The contents of the Tedlar bag are analyzed. The method specifies a 72 hour holding time from collection to analysis. The condensate is also analyzed. The total amount in the sample is equal to the sum of the bag contents and condensate.
The method requires the collection and analysis of a field blank (one daily per source) to check for contamination in the field and two trip blanks to check for contamination during shipping and handling. The method also requires a field spiked sample (one per every 10 samples) that is spiked at 2 times the expected concentrations.
NOTE: SW-846 Method 8240 has been replaced by SW-846 Method 8260B.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 72 hours from sample collection to analysis |
| Preservatives: | Keep bag samples away from sunlight and at temperatures above 0°C. Keep condensates at 4°C with no headspace. |
| Required Preps: | Tedlar bag |
| Collection Method: | Bag sampling following procedures in EPA Method 0040 |
| Analytical Methodology: | GC/MS |
| Documentation: | 
0040
8260B
|
| SKU | Item | Price | |
|---|---|---|---|
| TB | Sampling Bags: Air Sampling Bags | $ Call for Price | |
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Allyl chloride | C3H5Cl |
107-05-1 |
0.1 |
ppm |
| Toluene | C7H8 |
108-88-3 |
0.08 |
ppm |
| Hexane | C6H14 |
110-54-3 |
0.1 |
ppm |
| Isooctane (2,2,4-Trimethylpentane) | C8H18 |
540-84-1 |
0.1 |
ppm |
| Carbon tetrachloride | CCl4 |
56-23-5 |
0.03 |
ppm |
| Vinyl Bromide | C2H3Br |
593-60-2 |
0.1 |
ppm |
| Benzene | C6H6 |
71-43-2 |
0.16 |
ppm |
| 1,1,1-Trichloroethane | C2H3Cl3 |
71-55-6 |
0.03 |
ppm |
| Chloromethane (Methyl chloride) | CH3Cl |
74-87-3 |
0.07 |
ppm |
| Vinyl chloride | C2H3Cl |
75-01-4 |
0.11 |
ppm |
| Methylene chloride | CH2Cl2 |
75-09-2 |
0.05 |
ppm |
| 1,1-Dichloroethane | C2H4Cl2 |
75-34-3 |
0.07 |
ppm |
| 1,1-Dichloroethene | C2H2Cl2 |
75-35-4 |
0.07 |
ppm |
| Trichlorofluoromethane | CCl3F |
75-69-4 |
0.18 |
ppm |
| Trichloroethene | C2HCl3 |
79-01-6 |
0.04 |
ppm |
* 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.