This method is for the collection and determination of methyl bromide (bromomethane) from workplace air. The sample is collected using two petroleum charcoal tubes connected in series. After collection the tubes are desorbed with carbon disulfide and anlayzed by GC/FID (flame ionization detector).
The working range of the method is 40 to 400 mg/m3 (10 to 100 ppm) for a 5L air sample.
NOTE: This method revises Method S372.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method says > 7 days from collection to analysis if samples are kept at 20°C. |
| Preservatives: | Store samples at 20°C. |
| Required Preps: | Charcoal tubes, 400/200mg |
| Collection Method: | The method recommends a 0.01 - 1 L/min. flow rate with a 2.5 - 11L sample collection volume. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
2520
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Bromomethane | CH3Br |
74-83-9 |
0.01 |
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.