Method 622

The Determination of Organophosphorus Pesticides in Municipal and Industrial Wastewater

Scope:

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

Method Data

Method 622
Hold Time7 days (sample), 40 days (extract)
PreservationSamples 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 Volume1 Liter in glass amber bottle
Method RefernceEPA Method 622

Analyte List

Analyte
Azinphos-methyl
Bolstar
Chloropyrifos
Coumaphos
DEF
Demeton-S
Diazinon
Dichlorovos
Dimethoate
Disulfoton
EPN
Ethion
Ethoprop
Fensulfothion
Fenthion
Malathion
Methyl parathion
Mevinphos
Naled
Parathion
Phorate
Prowl
Ronnel
Stirofos
Sulfotepp
Tokuthion
Trichloronate

 

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