Method CDFA OP/ON Pesticides

Organophosphorus and Organonitrogen Pesticides in Food by California Department of Food and Agriculture (CDFA) Screening Method


Organophosphorus (OP) and organonitrogen (ON) pesticides are extracted from the food into acetonitrile.  The extract is solvent exchanged, processed through clean-up and analyzed by GC/NPD (nitrogen/phosphorus detector) or GC/FPD (flame photometric detector).  All positive detects are confirmed on a second column or detector.


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in method.
Preservatives:   None specified in method.
Required Preps:   None.
Collection Method:   Grab sampling
Analytical Methodology:   GC/NPD or GC/FPD
Documentation:  

Analyte List*

Analyte Formula CAS Number Detection Limit
Methamidophos
10265-92-6
0.01
 ppm
O-Methoate
C5H12NO4PS
1113-02-6
0.05
 ppm
Malathion
C10H19O6PS2
121-75-5
0.02
 ppm
Fenitrothion
C9H12NO5PS
122-14-5
0.03
 ppm
Simazine
C7H12ClN5
122-34-9
0.05
 ppm
Diphenylamine
C12H11N
122-39-4
0.05
 ppm
Ethoprop
C8H19O2PS2
13194-48-4
0.05
 ppm
Dicrotophos
C8H16NO5P
141-66-2
0.02
 ppm
Thiabendazol
C10H7N3S
148-79-8
0.05
 ppm
Prometon
C10H19N5O
1610-18-0
0.05
 ppm
Atrazine
C8H14ClN5
1912-24-9
0.03
 ppm
EPN
C14H14NO4PS
2104-64-5
0.02
 ppm
Metribuzin (Sencor)
C8H14N4OS
21087-64-9
0.05
 ppm
Cyanazine
C9H13ClN6
21725-46-2
0.05
 ppm
Molinate
C9H17NOS
2212-67-1
0.05
 ppm
Fenamiphos (Nemacur)
C13H22NO3PS
22224-92-6
0.02
 ppm
Tetrachlorvinphos
C10H9Cl4O4P
22248-79-9
0.02
 ppm
Triazofos (Hostathion)
24017-47-8
0.02
 ppm
Isofenphos
C15H24NO4PS
25311-71-1
0.03
 ppm
Benthiocarb
C12H16ClNOS
28249-77-6
0.05
 ppm
Chlorpyrifos (Dursban)
C9H11Cl3NO3PS
2921-88-2
0.02
 ppm
Thionazin (Zinophos)
C8H13N2O3PS
297-97-2
0.02
 ppm
Methyl parathion
C8H10NO5PS
298-00-0
0.03
 ppm
Phorate
C7H17O2PS3
298-02-2
0.05
 ppm
Disulfoton
C8H19O2PS3
298-04-4
0.02
 ppm
Ronnel
C8H8Cl3O3PS
299-84-3
0.03
 ppm
Naled (Dibrom)
C4H7Br2Cl2O4P
300-76-5
0.05
 ppm
Acephate (Orthene)
C4H10NO3PS
30560-19-1
0.02
 ppm
Diazinon
C12H21N2O3PS
333-41-5
0.03
 ppm
Sulprofos (Bolstar)
C12H19O2PS3
35400-43-2
0.03
 ppm
Chlorfenvinphos
C12H14Cl3O4P
470-90-6
0.03
 ppm
Metolachlor
C15H22ClNO2
51218-45-2
0.05
 ppm
Hexazinone
C12H20N4O2
51235-04-2
0.05
 ppm
Fenthion (Baytex)
C10H15O3PS2
55-38-9
0.02
 ppm
Chlorpyrifos-methyl
C7H7Cl3NO3PS
5598-13-0
0.03
 ppm
Ethion
C9H22O4P2S4
563-12-2
0.03
 ppm
Ethyl parathion
C10H14NO5PS
56-38-2
0.04
 ppm
Coumaphos (Co-Ral)
C14H16ClO5PS
56-72-4
0.05
 ppm
Metalaxyl
C15H21NO4
57837-19-1
0.05
 ppm
Terbacil
C9H13ClN2O2
5902-51-2
0.05
 ppm
Dimethoate
C5H12NO3PS2
60-51-5
0.02
 ppm
Prometryn
C10H19N5S
7287-19-6
0.05
 ppm
Phosmet
C11H12NO4PS2
732-11-6
0.03
 ppm
Crotoxyphos (Ciodrin)
C14H19O6P
7700-17-6
0.05
 ppm
Mevinphos (Phosdrin)
C7H13O6P
7786-34-7
0.05
 ppm
Carbophenothion
C11H16ClO2PS3
786-19-6
0.02
 ppm
Demeton
C8H19O3PS2
8065-48-3
0.04
 ppm
Azinphos-methyl (Guthion)
C10H12N3O3PS2
86-50-0
0.05
 ppm
Fonofos (Dyfonate)
C10H15OPS2
944-22-9
0.04
 ppm
Methidathion (Supracide)
C6H11N2O4PS3
950-37-8
0.03
 ppm
Myclobutanil (Rally)
88671-89-0
0.05
 ppm
Bensulide
741-58-2
0.04
 ppm
Tribufos (DEF)
78-48-8
0.05
 ppm
Metasystox-R
301-12-2
0.05
 ppm
Phosalone
2310-17-0
0.05
 ppm
Primiphos-methyl
0.05
 ppm
Profenophos (Curacron)
41198-08-7
0.02
 ppm
Propetamphos (Safrotin)
31218-83-4
0.02
 ppm
Acetamipride
135410-20-7
0.05
 ppm
Azoxystrobin
131860-33-8
0.03
 ppm
Cyromazine
66215-27-8
0.05
 ppm
Cyprodinil
121552-61-2
0.05
 ppm
Dimethomorph
110488-70-5
0.05
 ppm
Fenamidone
161326-34-7
0.05
 ppm
Fipronil
120068-37-3
0.05
 ppm
Fludioxinil
131341-86-1
0.05
 ppm
Imazalil
35554-44-0
0.05
 ppm
Kresoxim-methyl
143390-89-0
0.05
 ppm
Pymetrozine
123312-89-0
0.05
 ppm
Pyraclostrobin
175013-18-0
0.05
 ppm
Pyriproxifen
95737-68-1
0.05
 ppm
Tebuconazole
107534-96-3
0.05
 ppm

* 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.