This method is for the collection and analysis of phosgene in ambient air. Air is passed through a solution of aniline to form carbanilide which is analyzed by high performance liquid chromatography (HPLC).
The sample is collected using a rotameter, pump and three midget impingers. The first two impingers are filled with 10mL of aniline/toluene (2:98 v/v). The third impinger contains silica gel. After sample collection, the impinger solution contents are combined into a glas bottle. The impingers are rinsed with toluene and the rinse is added to the impinger contents. Mark the volume level on the bottle before shipment.
The sample is taken to dryness by the lab under a stream of nitrogen, the residue is dissolved in 1 mL of acetonitrile and analyzed by reversed-phase HPLC with UV detection.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The sample is stable indefinitely per the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | 50mL Glass bottle with Teflon-lined lid |
| Collection Method: | Midget impinger train |
| Analytical Methodology: | HPLC/UV |
| Documentation: | 
TO-6
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Phosgene | CCl2O |
75-44-5 |
0.1 |
ppbv |
* 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.