This method is for the determination of aromatic hydrocarbons. The sample is collected on a charcoal tube, desorbed with carbon disulfide and analyzed using GC/FID (flame ionization detector). There is the possibility that interactions between analytes may reduce the breakthrough volumes and change desorption efficiencies. Under high humidity conditions, the breakthrough volumes may be reduced. Other volatile organic compounds such as alcohols, ketones, ethers, and halogenated hydrocarbons are potential analytical interferences.
Naphthalene was originally validated in Method S292 but it failed to meet acceptable desorption efficiency recovery and storage stability criteria at the levels evaluated in this study. However, naphthalene levels at or near the REL/PEL continues to meet acceptable recovery criteria. Styrene failed to meet acceptable recovery criteria at the two lowest levels evaluated in this study (highest level to meet the criteria was 181 μg/sample).
NOTE: This method is based on and supercedes Methods P&CAM 127 (benzene, styrene, toluene and xylene), S311 (benzene), S22 (p-tert-butyltoluene), S23 (cumene), S29 (ethylbenzene), S26 (a-methylstyrene), S292 (naphthalene), S30 (styrene), S343 (toluene), S25 (vinyltoluene), and S318 (xylene).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Per the method, samples are stable for 30 days if kept at 5°C. |
| Preservatives: | None specified in the method. |
| Required Preps: | Charcoal tube, 100 mg/50 mg (SKC 226-01) |
| Collection Method: | Varies per analyte. The flow rate ranges from 0.2 - 1.0 L/min. and collection volumes from 1 - 100 L. Refer to Table 3 of the method for hydrocarbon specific information. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
1501
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Ethylbenzene | C8H10 |
100-41-4 |
0.01 |
mg/sample |
| Styrene | C8H8 |
100-42-5 |
0.01 |
mg/sample |
| Toluene | C7H8 |
108-88-3 |
0.01 |
mg/sample |
| Xylenes (total) | 1330-20-7 |
0.01 |
mg/sample | |
| Methylstyrene (Vinyl toluene) | C9H10 |
25013-15-4 |
0.01 |
mg/sample |
| Benzene | C6H6 |
71-43-2 |
0.01 |
mg/sample |
| Naphthalene | C10H8 |
91-20-3 |
0.01 |
mg/sample |
| p-tert-Butyltoluene | C11H16 |
98-51-1 |
0.01 |
mg/sample |
| Cumene (Isopropylbenzene) | C9H12 |
98-82-8 |
0.01 |
mg/sample |
| alpha-Methyl styrene | C9H10 |
98-83-9 |
0.01 |
mg/sample |
* 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.