This is a purge and trap gas chromatographic/mass spectrometer (GC/MS) method applicable to the determination of various purgeable organics in municipal and industrial discharges as provided under 40 CFR Part 136.1. An inert gas is bubbled through a 5 mL water sample contained in a specially-designed purging chamber at ambient temperature. The purgeables are efficiently transferred from the aqueous phase to the vapor phase. The vapor is swept through a sorbent trap where the purgeables are trapped. After purging is completed, the trap is heated and backflushed with the inert gas to desorb the purgeables onto a gas chromatographic column. The gas chromatograph is temperature programmed to separate the purgeables which are then detected with a mass spectrometer.
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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; if residual chlorine is present, add 10 mg/40 mL of sodium thiosulfate; adjust to pH < 2 with HCl if benzene, toluene, or ethyl benzene is to be determined |
| Required Preps: | Vial—25 mL capacity or larger, equipped with a screw cap with a hole in the center. |
| Collection Method: | Collect in glass container with volume of at least 26mL; fill bottle just to overflowing so that no air bubbles pass through; seal bottle so that no air bubbles are entrapped; if preservative has been added, shake vigorously; maintain seal until analysis |
| Analytical Methodology: | GC/MS |
| Documentation: | 
624
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Ethylbenzene | C8H10 |
100-41-4 |
7.2 |
µg/L |
| cis-1,3-Dichloropropene | C3H4Cl2 |
10061-01-5 |
5 |
µg/L |
| trans-1,3-Dichloropropene | C3H4Cl2 |
10061-02-6 |
||
| 1,4-Dichlorobenzene | C6H4Cl2 |
106-46-7 |
||
| 1,2-Dichloroethane | C2H4Cl2 |
107-06-2 |
2.8 |
µg/L |
| Toluene | C7H8 |
108-88-3 |
6 |
µg/L |
| Chlorobenzene | C6H5Cl |
108-90-7 |
6 |
µg/L |
| Ethyl Vinyl Ether | C4H7ClO |
110-75-8 |
||
| Chlorodibromomethane | CHBr2Cl |
124-48-1 |
3.1 |
µg/L |
| Tetrachloroethene | C2Cl4 |
127-18-4 |
4.1 |
µg/L |
| trans-1,2-Dichloroethene | C2H2Cl2 |
156-60-5 |
1.6 |
µg/L |
| 1,3-Dichlorobenzene | C6H4Cl2 |
541-73-1 |
||
| Carbon tetrachloride | CCl4 |
56-23-5 |
2.8 |
µg/L |
| Chloroform | CHCl3 |
67-66-3 |
1.6 |
µg/L |
| Benzene | C6H6 |
71-43-2 |
4.4 |
µg/L |
| 1,1,1-Trichloroethane | C2H3Cl3 |
71-55-6 |
3.8 |
µg/L |
| Bromomethane | CH3Br |
74-83-9 |
||
| Chloromethane (Methyl chloride) | CH3Cl |
74-87-3 |
||
| Chloroethane | C2H5Cl |
75-00-3 |
||
| Vinyl chloride | C2H3Cl |
75-01-4 |
||
| Methylene chloride | CH2Cl2 |
75-09-2 |
2.8 |
µg/L |
| Bromoform | CHBr3 |
75-25-2 |
4.7 |
µg/L |
| Bromodichloromethane | CHBrCl2 |
75-27-4 |
2.2 |
µg/L |
| 1,1-Dichloroethane | C2H4Cl2 |
75-34-3 |
4.7 |
µg/L |
| 1,1-Dichloroethene | C2H2Cl2 |
75-35-4 |
2.8 |
µg/L |
| Trichlorofluoromethane | CCl3F |
75-69-4 |
||
| 1,2-Dichloropropane | C3H6Cl2 |
78-87-5 |
6 |
µg/L |
| 1,1,2-Trichloroethane | C2H3Cl3 |
79-00-5 |
5 |
µg/L |
| Trichloroethene | C2HCl3 |
79-01-6 |
1.9 |
µg/L |
| 1,1,2,2-Tetrachloroethane | C2H2Cl4 |
79-34-5 |
6.9 |
µg/L |
| 1,2-Dichlorobenzene | C6H4Cl2 |
95-50-1 |
||
* 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.