This method is for the determination of dichlorodifluoromethane, 1,2-dichlorotetrafluoroethane, and chlorodifluoromethane by GC/FID. The working ranges are 1000 to 6000 ppm (5000 to 30000 mg/m³), 700-5700 ppm (5000 to 40000 mg/m³), and 300 to 4000 ppm (1000 to 14000 mg/m³) respectively for a 1 L air sample. The sample is collected on charcoal sorbent tubes and analyzed by GC/FID after desorption in methylene chloride. Note: This method combines and revises Methods S111 and S108.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | At least 7 days from sampling to analysis if kept at -10°C |
| Preservatives: | Store at -10°C. |
| Required Preps: | Solid sorbent tubes: 2 tandem coconut charcoal tubes in series, 400 mg/200 mg and 100 mg/50 mg, 9cm x 8mm OD x 6mm ID followed by 7cm x 6mm OD x 4mm ID |
| Collection Method: | Solid sorbent tubes: 1 - 4 L @ 0.01 - 0.05 L/min. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
1018
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Chlorodifluoromethane | CHClF2 |
75-45-6 |
0.03 |
mg |
| Dichlorodifluoromethane | CCl2F2 |
75-71-8 |
0.03 |
mg |
| 1,2-Dichlorotetrafluoroethane | C2Cl2F4 |
76-14-2 |
0.03 |
mg |
* 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.