This method is for the determination of various purgeable aromatics in municipal and industrial discharges as provided under 40 CFR Part 136.1. Inert gas is bubbled through a 5mL aliquot of water contained in a purging chamber at ambient temperature. The aromatics are transferred from the aqueous phase to the vapor phase which is swept onto a sorbent trap. Once purging is complete the trap ia heated ang backflushed with inert gas to desorb the aromatics onto a gas chromatograph (GC) equipped with a photoionization detector (PID). The method does allow for a second column confirmation.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 14 days from sample collection to analysis |
| Preservatives: | Samples must be iced or refrigerated from sampling to analysis and adjust to pH < 2 with HCl. If residual chlorine is present, add 10 mg/40 mL of sodium thiosulfate. |
| Required Preps: | Two - 40mL VOA vials |
| Collection Method: | Collect about 500 mL in aa clean container. Fill the sample bottle so that no air bubbles pass through the sample as the bottle is filled. Seal the bottle so that no air bubbles are entrapped in it. Keep sealed until analysis |
| Analytical Methodology: | GC/PID |
| Documentation: | 
602
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Ethylbenzene | C8H10 |
100-41-4 |
0.2 |
µg/L |
| 1,4-Dichlorobenzene | C6H4Cl2 |
106-46-7 |
0.3 |
µg/L |
| Toluene | C7H8 |
108-88-3 |
0.2 |
µg/L |
| Chlorobenzene | C6H5Cl |
108-90-7 |
0.2 |
µg/L |
| 1,3-Dichlorobenzene | C6H4Cl2 |
541-73-1 |
0.4 |
µg/L |
| Benzene | C6H6 |
71-43-2 |
0.2 |
µg/L |
| 1,2-Dichlorobenzene | C6H4Cl2 |
95-50-1 |
0.4 |
µg/L |
* 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.