Method 622

Determination of Organophosphorus Pesticides in Municipal and Industrial Wastewater


This method is for the determination of organophosphorus pesticides from municipal and industrial wastewater.  One Liter of sample 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 and analyzed using gas chromatography with a thermionic bead or flame photometric detector in the phosphorus mode (GC/FPD). 

 

 


(EPA: Office of Water)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   7 days from sample collection to extraction and 40 days from extraction to analysis.
Preservatives:   Cool to 4°C from the time of collection until extraction.
Required Preps:   1L amber glass bottle
Collection Method:   Grab sampling
Analytical Methodology:   GC/FPD
Documentation:   622

Analyte List*

Analyte Formula CAS Number Detection Limit
Fensulfothion
C11H17O4PS2
115-90-2
1.5
 µg/L
Ethoprop
C8H19O2PS2
13194-48-4
0.25
 µg/L
Merphos
C12H27PS3
150-50-5
0.25
 µg/L
Chlorpyrifos (Dursban)
C9H11Cl3NO3PS
2921-88-2
0.3
 µg/L
Methyl parathion
C8H10NO5PS
298-00-0
0.3
 µg/L
Phorate
C7H17O2PS3
298-02-2
0.15
 µg/L
Disulfoton
C8H19O2PS3
298-04-4
0.2
 µg/L
Ronnel
C8H8Cl3O3PS
299-84-3
0.3
 µg/L
Naled (Dibrom)
C4H7Br2Cl2O4P
300-76-5
0.1
 µg/L
Trichloronate
C10H12Cl3O2PS
327-98-0
0.15
 µg/L
Diazinon
C12H21N2O3PS
333-41-5
0.6
 µg/L
Tokuthion
C11H15Cl2O2PS2
34643-46-4
0.5
 µg/L
Sulprofos (Bolstar)
C12H19O2PS3
35400-43-2
0.15
 µg/L
Fenthion (Baytex)
C10H15O3PS2
55-38-9
0.1
 µg/L
Chlorpyrifos-methyl
C7H7Cl3NO3PS
5598-13-0
0.3
 µg/L
Coumaphos (Co-Ral)
C14H16ClO5PS
56-72-4
1.5
 µg/L
Dichlorvos
C4H7Cl2O4P
62-73-7
0.1
 µg/L
Mevinphos (Phosdrin)
C7H13O6P
7786-34-7
0.3
 µg/L
Demeton
C8H19O3PS2
8065-48-3
0.25
 µg/L
Azinphos-methyl (Guthion)
C10H12N3O3PS2
86-50-0
1.5
 µg/L
Stirophos
961-11-5
5
 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.