The Determination of Organophosphorus Pesticides in Municipal and Industrial Wastewater
This method covers the determination of certain organophosphorus pesticides.
This is a gas chromatographic (GC) method applicable to the determination of the compounds listed above in industrial and municipal discharges as provided under 40 CFR 136.1.
A measured volume of sample, approximately 1 L, is extracted with 15% methylene chloride using a separatory funnel. The methylene chloride extract is dried and exchanged to hexane during concentration to a volume of 10 mL or less. Gas chromatographic conditions are described which permit the separation and measurement of the compounds in the extract by gas chromatography with a thermionic bead or flame photometric detector in the phosphorus mode.
–Method 622: The Determination of Organophosphorus Pesticides in Municipal and Industrial Wastewater, EPA 1992
|Hold Time||7 days (sample), 40 days (extract)|
|Preservation||Samples must be on ice refrigerated at 4°C from the time of collection until extraction. Adjust the pH of the sample to 6-8 with 6N sodium hydroxide or 6N sulfuric acid immediately after sampling.|
|Sample Volume||1 Liter in glass amber bottle|
|Method Refernce||EPA Method 622|
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