EPA Method 622

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EPA Method 622:
The Determination of Organophosphorus Pesticides in Municipal and Industrial Wastewater

Summary:
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.

Scope:
This method covers the determination of certain organophosphorus pesticides.