EPA Method 622.1

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EPA Method 622.1:
The Determination of Thiophosphate Pesticides in Municipal and Industrial Wastewater

A measured volume of sample, approximately 1 L, is extracted with methylene chloride using a separatory funnel. The methylene chloride extract is dried and concentrated to 1.0 mL. Gas chromatographic conditions are described which permit the separation and measurement of the compounds in the extract by alkali flame detector gas chromatography (GC/AFD).

This method covers the determination of certain thiophosphate pesticides.