This method is designed for the determination of nitroaromatic compounds. The sample is collected on silica sorbent tubes, desorbed with methanol in an ultrasonic bath, and analyzed by GC/FID. The working ranges for 30 L air samples are 0.396 to 1.92 ppm (1.98 to 9.60 mg/m³) for nitrobenzene, 0.346 to 1.73 ppm (1.97 to 9.86 mg/m³) for o-nitrotoluene, 0.344 to 1.72 ppm (1.96 to 9.81 mg/m³) for m-nitrotoluene, 0.303 to 1.52 ppm (1.73 to 8.67 mg/m³) for p-nitrotoluene, and 0.308 to 1.54 ppm (1.98 to 9.92 mg/m³) for 4-chloronitrobenzene. During sampling, high humidity may greatly decrease breakthrough volume. NOTE: This method is an update of NMAM 2005 (8/15/94), which combined and replaced Methods S217, S218, and S223.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 30 days from sampling to analysis if kept at 5°C |
| Preservatives: | Store at 5°C. |
| Required Preps: | Solid sorbent tube: silica gel, 150 mg/75 mg, 7cm x 6mm OD x 4mm ID |
| Collection Method: | Solid sorbent tube: 10 - 150 L @ 0.01 - 1 L/min. for nitrobenzene, 1 - 30 L @ 0.01 - 0.02 L/min. for o-, m-, p-nitrotoluene, 1 - 150 L @ 0.01 - 1 L/min. for 4-chloronitrobenzene |
| Analytical Methodology: | GC/FID |
| Documentation: | 
2005
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 4-Chloronitrobenzene | C6H4ClNO2 |
100-00-5 |
2.5 |
µg |
| 2-Nitrotoluene | C7H7NO2 |
88-72-2 |
0.8 |
µg |
| Nitrobenzene | C6H5NO2 |
98-95-3 |
0.6 |
µg |
| 3-Nitrotoluene | C7H7NO2 |
99-08-1 |
1 |
µg |
| 4-Nitrotoluene | C7H7NO2 |
99-99-0 |
2.6 |
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.