This method is for the determination of methylene chloride. The sample is collected on charcoal sorbent tubes, desorbed in carbon disulfide, and analyzed by GC/FID. The working range for this method is 0.4 - 749 ppm (1.4 to 2600 mg/m³) for a 1 L sample. An electron capture detector (ECD) may be used to obtain the lowest feasible level of detection and quantitation. For ECD, desorption is in toluene with an LOD (limit of detection) of 0.002 µg per sample.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Approximately 30 days from sampling to analysis if kept at 5°C |
| Preservatives: | Keep refrigerated at 5 °C. |
| Required Preps: | Solid sorbent tubes: 2 coconut charcoal tubes in series, 100 mg/50 mg, 7cm x 6mm OD x 4mm ID |
| Collection Method: | Solid sorbent tube: 0.5 - 2.5 L @ 0.01 - 0.2 L/min. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
1005
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methylene chloride | CH2Cl2 |
75-09-2 |
0.4 |
µg |
* 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.