This method is for the determination of demeton. The sample is collected on mixed cellulose ester membrane filters followed by XAD-2 sorbent tubes. The sample is desorbed 5mL toluene for 15 minutes, followed by GC analysis with a phosphorous flame photometric detection system. The working range is 0.015 to 10 mg/m³ for a 200-L air sample. The use of a capillary column, e.g., a DB-210, may improve sensitivity and resolution. Note: This revises Method S280.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | At least seven days. |
| Preservatives: | Store at room temperature. |
| Required Preps: | Mixed cellulose ester membrane filter, 2-µm with XAD-2 sorbent tube, 150mg/75mg. |
| Collection Method: | Mixed cellulose ester membrane filter and XAD-2 sorbent tube: 30L - 500L @ 0.2 -1L/min. |
| Analytical Methodology: | GC/FPD |
| Documentation: | 
5514
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Demeton | C8H19O3PS2 |
8065-48-3 |
0.1 |
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.