This method is for the determination of aliphatic amines. The amines evaluated in the method are diethylamine (DEA), and dimethylamine (DMA). The sample is collected on a silica gel tube. After collection the sample is desorbed in 1 mL dilute sulfuric acid in 10% (v/v) aqueous methanol and analyzed by GC/FID (flame ionization detector).
The use of a nitrogen-specific detector (NPD) instead of an FID will greatly increase sensitivity.
The working ranges of the method for a 20 L air sample are 8 to 183 ppm (25 to 550 mg/m³) for diethylamine and 4 to 71 ppm (7.5 to 130 mg/m³) for dimethylamine.
Note: This method revises and combines Methods S139 and S142. To avoid possible sample instability on silica gel, OSHA developed OSHA 34 which employs XAD-7 coated with 7-chloro-4-nitrobenzo-2-oxa-1,3-diazole for sampling followed by HPLC analysis of the derivative.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | Keep samples refrigerated after collection and during shipment. |
| Required Preps: | Silica gel tube, 150 mg/75 mg, (SKC 226-10) |
| Collection Method: | The method specifies a 0.01 - 1 L/min. flow rate and a 3- 30 L sample collection volume. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
2010
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Diethylamine | C4H11N |
109-89-7 |
0.02 |
mg |
| Dimethylamine | C2H7N |
124-40-3 |
0.02 |
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.