This method is used for the determination of methanol. The sample is collected on a silica gel tube. After sample collection the tube is desorbed with 95:5 water:isopropanol and analyzed by GC/FID (flame ionization detector).
The working range for the method is 0.4 to 1200 mg/m³ (0.3 to 916 ppm) for a 5 L air sample. At high concentrations of methanol or high relative humidity, a large silica gel tube (700mg) is required.
NOTE: This method updates and replaces NMAM 2000 (August 15, 1994) which combined and replaced Methods S59 and P&CAM 247.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method states the samples are stable for 30 days from sampling to analysis if kept at 5°C. |
| Preservatives: | Store at 5°C. |
| Required Preps: | Silica gel, 100 mg/50 mg, (SKC 226-51) |
| Collection Method: | The method recommends a flow rate of 0.02 - 0.2 L/min. with a sample volume of 1 - 5 L. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
2000
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methanol | CH4O |
67-56-1 |
0.7 |
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.