This method is used for the collection and analysis of acetonitrile. The sample is collected on a coconut shell charcoal tube. After collection, the sample is desorbed with 2mL of methylene chloride/methanol (85:15) and analyzed using GC/FID (flame ionization detector). Large (400 mg/200 mg) charcoal tubes are required for analyte collection, since the breakthrough volume is lower with smaller charcoal tubes. The analytical capacity of large charcoal tubes has not been determined under conditions of high relative humidity.
The working range of the method is 0.06 to 7.4 ppm (0.1 to 12.5 mg/m³) for a 25L sample.
NOTE: This method revises NMAM 1606 (dated 8/15/94) and is based on Method S165.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | At least 30 days from sampling to analysis if samples are kept at 5°C. |
| Preservatives: | Store samples at 5°C. |
| Required Preps: | Coconut shell charcoal tube, 200/400 mg (SKC 226-09) |
| Collection Method: | The method recommends a flow rate of 0.01 - 0.2 L/min. and a 1 - 25 L sample collection volume. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
1606
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Acetonitrile | C2H3N |
75-05-8 |
0.8 |
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.