This method is for the determination of organophosphorous pesticides. Samples are collected on XAD-2 sorbent tubes and then extracted with 2-mL 90% toluene/10% acetone solution. The sample is analyzed by Gas Chromatography with flame photometric detection. This method also is applicable to STEL (short term exposure limit) measurements using 12-L samples. This method may be applicable to the determination of other organophosphorus compounds after evaluation for desorption efficiency, sample capacity, sample stability, and precision and accuracy.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | At least 10 days at 25 °C or at least 30 days at 0 °C. |
| Preservatives: | Keep refrigerated. |
| Required Preps: | Solid sorbent tube, XAD-2 resin 5cm x 11-mm ID x 13-mm OD; 270mg/140mg and 13-mm quartz filter (OVS-2 Sampler). |
| Collection Method: | OVS-2 Sampler; 12L to 240L (60L for Malathion and Ronnel) @ 0.2 - 1L/min. |
| Analytical Methodology: | GC/FPD |
| Documentation: | 
5600
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Methamidophos | 10265-92-6 |
0.6 |
µg/sample/m³ | |
| Malathion | C10H19O6PS2 |
121-75-5 |
0.1 |
µg/sample/m³ |
| Terbufos | C9H21O2PS3 |
13071-79-9 |
0.04 |
µg/sample/m³ |
| Ethoprop | C8H19O2PS2 |
13194-48-4 |
0.04 |
µg/sample/m³ |
| Dicrotophos | C8H16NO5P |
141-66-2 |
0.2 |
µg/sample/m³ |
| Fenamiphos (Nemacur) | C13H22NO3PS |
22224-92-6 |
0.14 |
µg/sample/m³ |
| Chlorpyrifos (Dursban) | C9H11Cl3NO3PS |
2921-88-2 |
0.04 |
µg/sample/m³ |
| Methyl parathion | C8H10NO5PS |
298-00-0 |
0.04 |
µg/sample/m³ |
| Mevinphos (E) | 298-01-1 |
0.12 |
µg/sample/m³ | |
| Phorate | C7H17O2PS3 |
298-02-2 |
0.04 |
µg/sample/m³ |
| Disulfoton | C8H19O2PS3 |
298-04-4 |
0.04 |
µg/sample/m³ |
| Ronnel | C8H8Cl3O3PS |
299-84-3 |
0.04 |
µg/sample/m³ |
| Diazinon | C12H21N2O3PS |
333-41-5 |
0.04 |
µg/sample/m³ |
| Sulprofos (Bolstar) | C12H19O2PS3 |
35400-43-2 |
0.06 |
µg/sample/m³ |
| Ethion | C9H22O4P2S4 |
563-12-2 |
0.04 |
µg/sample/m³ |
| Ethyl parathion | C10H14NO5PS |
56-38-2 |
0.04 |
µg/sample/m³ |
| Monocrotophos | C7H14NO5P |
6923-22-4 |
0.4 |
µg/sample/m³ |
| Mevinphos (Phosdrin) | C7H13O6P |
7786-34-7 |
0.12 |
µg/sample/m³ |
| Azinphos-methyl (Guthion) | C10H12N3O3PS2 |
86-50-0 |
0.12 |
µg/sample/m³ |
| Monocrotophos (Z) | 919-44-8 |
0.4 |
µg/sample/m³ | |
| Fonofos (Dyfonate) | C10H15OPS2 |
944-22-9 |
0.04 |
µg/sample/m³ |
* 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.