This is a gas chromatographic (GC) method applicable to the determination of certain nitrogen- and phosphorus-containing pesticides in ground water and finished drinking water. A measured volume of sample of approximately 1 L is extracted with methylene chloride by shaking in a separatory funnel or mechanical tumbling in a bottle. The methylene chloride extract is isolated, dried and concentrated to a volume of 5 mL during a solvent exchange to methyl tert-butyl ether. Chromatographic conditions are described which permit the separation and measurement of the analytes in the extract by Capillary Column GC with a nitrogen-phosphorus detector (NPD).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Analytes stored are stable up to 14 days; however, some analytes must be extracted immediately. A 14-day maximum extract storage time is recommended. |
| Preservatives: | If residual chlorine is present, add 80 mg of sodium thiosulfate per liter of sample to the sample bottle prior to collecting the sample. The samples must be iced or refrigerated at 4°C away from light from the time of collection until extraction. |
| Required Preps: | Glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | GC/NPD (Nitrogen Phosphorous Detector) |
| Documentation: | 
507
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Chlorpropham | C10H12ClNO2 |
101-21-3 |
0.2 |
µg/L |
| Simetryn | C8H15N5S |
1014-70-6 |
0.035 |
µg/L |
| Pebulate | C10H21NOS |
1114-71-2 |
0.022 |
µg/L |
| Cycloate | C11H21NOS |
1134-23-2 |
0.022 |
µg/L |
| MGK-264 | C17H25NO2 |
113-48-4 |
0.19 |
µg/L |
| Simazine | C7H12ClN5 |
122-34-9 |
0.014 |
µg/L |
| Terbufos | C9H21O2PS3 |
13071-79-9 |
0.054 |
µg/L |
| Ethoprop | C8H19O2PS2 |
13194-48-4 |
0.021 |
µg/L |
| Propazine | C9H16ClN5 |
139-40-2 |
0.014 |
µg/L |
| Merphos | C12H27PS3 |
150-50-5 |
0.04 |
µg/L |
| Napropamide | C17H21NO2 |
15299-99-7 |
0.069 |
µg/L |
| Alachlor (Lasso) | C14H20ClNO2 |
15972-60-8 |
0.14 |
µg/L |
| Atraton | C9H17N5O |
1610-17-9 |
0.17 |
µg/L |
| Prometon | C10H19N5O |
1610-18-0 |
0.041 |
µg/L |
| Atrazine | C8H14ClN5 |
1912-24-9 |
0.015 |
µg/L |
| Vernolate | C10H21NOS |
1929-77-7 |
0.055 |
µg/L |
| Butylate | C11H23NOS |
2008-41-5 |
0.053 |
µg/L |
| Metribuzin (Sencor) | C8H14N4OS |
21087-64-9 |
0.029 |
µg/L |
| Molinate | C9H17NOS |
2212-67-1 |
0.061 |
µg/L |
| Fenamiphos (Nemacur) | C13H22NO3PS |
22224-92-6 |
0.12 |
µg/L |
| Tetrachlorvinphos | C10H9Cl4O4P |
22248-79-9 |
0.18 |
µg/L |
| Butachlor | C17H26ClNO2 |
23184-66-9 |
0.12 |
µg/L |
| Pronamide (Kerb, Propyzamide) | C12H11Cl2NO |
23950-58-5 |
0.28 |
µg/L |
| Disulfoton sulfone | C8H19O4PS3 |
2497-06-5 |
0.63 |
µg/L |
| Disulfoton sulfoxide | 2497-07-6 |
0.082 |
µg/L | |
| Norflurazon | C12H9ClF3N3O |
27314-13-2 |
0.098 |
µg/L |
| Disulfoton | C8H19O2PS3 |
298-04-4 |
0.029 |
µg/L |
| Bromacil | C9H13BrN2O2 |
314-40-9 |
0.69 |
µg/L |
| Diazinon | C12H21N2O3PS |
333-41-5 |
0.13 |
µg/L |
| Tebuthiuron | C9H16N4OS |
34014-18-1 |
0.58 |
µg/L |
| Tricyclazole | C9H7N3S |
41814-78-2 |
0.21 |
µg/L |
| Triadimefon (Bayleton) | C14H16ClN3O2 |
43121-43-3 |
0.093 |
µg/L |
| Metolachlor | C15H22ClNO2 |
51218-45-2 |
0.19 |
µg/L |
| Hexazinone | C12H20N4O2 |
51235-04-2 |
0.15 |
µg/L |
| Carboxin | C12H13NO2S |
5234-68-4 |
0.18 |
µg/L |
| Terbacil | C9H13ClN2O2 |
5902-51-2 |
0.56 |
µg/L |
| Fluridone | C19H14F3NO |
59756-60-4 |
2.8 |
µg/L |
| Fenarimol | C17H12Cl2N2O |
60168-88-9 |
0.2 |
µg/L |
| Dichlorvos | C4H7Cl2O4P |
62-73-7 |
0.28 |
µg/L |
| Prometryn | C10H19N5S |
7287-19-6 |
0.024 |
µg/L |
| EPTC | C9H19NOS |
759-94-4 |
0.08 |
µg/L |
| Mevinphos (Phosdrin) | C7H13O6P |
7786-34-7 |
0.87 |
µg/L |
| Ametryne | C9H17N5S |
834-12-8 |
0.2 |
µg/L |
| Terbutryn | C10H19N5S |
886-50-0 |
0.031 |
µg/L |
| Methyl Paraoxon | 950-35-6 |
0.3 |
µg/L | |
| Diphenamid | C16H17NO |
957-51-7 |
0.082 |
µg/L |
* 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.