This method is for the determination of methylal. The sample is collected on charcoal sorbent tubes, desorbed in 1 mL hexane, and analyzed by GC/FID. The working range is 480 to 1930 ppm (1500 to 6000 mg/m³) for a 2 L air sample. Samples containing smaller quantities of methylal may have low desorption efficiency. Breakthrough capacity at high humidity is not known. Note: This method revises Method S71.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Not noted in method |
| Preservatives: | None noted in method |
| Required Preps: | Solid sorbent tube: coconut shell charcoal, 100 mg/50 mg, 7 cm X 6 mm OD x 4 mm ID |
| Collection Method: | Solid sorbent tube: 1 - 3 L @ 0.01 - 0.2 L/min. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
1611
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methylal | C3H8O2 |
109-87-5 |
0.1 |
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.