This method is for the determination of aromatic amines. The sample is collected on a silica gel tube. After collection the sample is desorbed with 95% ethanol and then analyzed by GC/FID (flame ionization detector). The method states that use of a nitrogen-specific GC detector instead of an FID will greatly increase sensitivity.
Silica gel has reduced capacity for organic compounds at high humidity.
NOTE: This method combines NIOSH Methods S162 (xylidine), S164 (dimethylaniline), S168 (o-toluidine), S310 (aniline), P&CAM 280 (N,N-dimethyl-p-toluidine), and P&CAM 168 (aromatic amines).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Aniline, o-toluidine and 2,4-xylidine are stable for at least 7 days from sampling to analysis. Stability data is not noted in the method for N,N-dimethyl-p-toluidine and N,N-dimethylanailine. |
| Preservatives: | None specified in the method. |
| Required Preps: | Silica gel tube, 150 mg/75 mg (SKC 226-10) |
| Collection Method: | Minimum and maximum collection volumes and flow rates vary by analyte. Refer to Table 3 in the method for the appropriate volumes and rates. |
| Analytical Methodology: | GC/FID |
| Documentation: | 
2002
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Dimethylaniline | C8H11N |
121-69-7 |
0.01 |
mg |
| Aniline | C6H7N |
62-53-3 |
0.01 |
mg |
| o-Toluidine | C7H9N |
95-53-4 |
0.01 |
mg |
| 2,4-Dimethylaniline | C8H11N |
95-68-1 |
0.01 |
mg |
| N,N-Dimethyl-p-toluidine | C9H13N |
99-97-8 |
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.