Clorpyrifos

Modify Date: 2025-08-19 23:21:58

Clorpyrifos Structure
Clorpyrifos structure
 Common Name Clorpyrifos
CAS Number 2921-88-2 Molecular Weight 350.586
Density 1.5±0.1 g/cm3 Boiling Point 375.9±52.0 °C at 760 mmHg
Molecular Formula C9H11Cl3NO3PS Melting Point 42-44°C
MSDS Chinese USA Flash Point 181.1±30.7 °C
Symbol GHS06 GHS09
GHS06, GHS09		 Signal Word Danger

 Use of Clorpyrifos


Chlorpyrifos is an organophosphate insecticide that is classified as a phosphorothionate. The oxon metabolite of Chlorpyrifos is an inhibitor of acetylcholinesterase (AChE), affecting neurological function in insects, humans, and other animals. The Chlorpyrifos oxon (CPO) metabolite is hydrolyzed by the plasma enzyme paraoxonase 1 (PON1), and susceptibility to neurotoxicity associated with CPO exposure is mitigated by PON1 overexpression.

 Names

Name chlorpyrifos
Synonym More Synonyms

 Clorpyrifos Biological Activity

Description Chlorpyrifos is an organophosphate insecticide that is classified as a phosphorothionate. The oxon metabolite of Chlorpyrifos is an inhibitor of acetylcholinesterase (AChE), affecting neurological function in insects, humans, and other animals. The Chlorpyrifos oxon (CPO) metabolite is hydrolyzed by the plasma enzyme paraoxonase 1 (PON1), and susceptibility to neurotoxicity associated with CPO exposure is mitigated by PON1 overexpression.
Related Catalog

 Chemical & Physical Properties

Density 1.5±0.1 g/cm3
Boiling Point 375.9±52.0 °C at 760 mmHg
Melting Point 42-44°C
Molecular Formula C9H11Cl3NO3PS
Molecular Weight 350.586
Flash Point 181.1±30.7 °C
Exact Mass 348.926270
PSA 82.48000
LogP 4.77
Vapour Pressure 0.0±0.8 mmHg at 25°C
Index of Refraction 1.566
InChIKey SBPBAQFWLVIOKP-UHFFFAOYSA-N
SMILES CCOP(=S)(OCC)Oc1nc(Cl)c(Cl)cc1Cl
Stability Stable. Incompatible with strong oxidizing agents.
Water Solubility Insoluble. 0.00013 g/100 mL

 Toxicological Information

CHEMICAL IDENTIFICATION

RTECS NUMBER :
TF6300000
CHEMICAL NAME :
Phosphorothioic acid, O,O-diethyl O-(3,5,6-trichloro-2-pyridyl) ester
CAS REGISTRY NUMBER :
2921-88-2
LAST UPDATED :
199806
DATA ITEMS CITED :
64
MOLECULAR FORMULA :
C9-H11-Cl3-N-O3-P-S
MOLECULAR WEIGHT :
350.59
WISWESSER LINE NOTATION :
T6NJ BOPS&O2&O2 CG EG FG

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Human - man
DOSE/DURATION :
300 mg/kg
TOXIC EFFECTS :
Peripheral Nerve and Sensation - paresthesis Behavioral - muscle weakness Behavioral - coma
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
82 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LC50 - Lethal concentration, 50 percent kill
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
>200 mg/m3/4H
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Administration onto the skin
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
202 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Unreported
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
150 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
60 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Administration onto the skin
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
120 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
192 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rabbit
DOSE/DURATION :
1 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Administration onto the skin
SPECIES OBSERVED :
Rodent - rabbit
DOSE/DURATION :
2 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - guinea pig
DOSE/DURATION :
504 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LDLo - Lowest published lethal dose
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - guinea pig
DOSE/DURATION :
100 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - pigeon
DOSE/DURATION :
10 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - chicken
DOSE/DURATION :
25400 ug/kg
TOXIC EFFECTS :
Peripheral Nerve and Sensation - flaccid paralysis without anesthesia (usually neuromuscular blockage) Behavioral - somnolence (general depressed activity) Behavioral - convulsions or effect on seizure threshold
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - quail
DOSE/DURATION :
13300 ug/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - duck
DOSE/DURATION :
76 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Unreported
SPECIES OBSERVED :
Mammal - species unspecified
DOSE/DURATION :
163 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - wild bird species
DOSE/DURATION :
5 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
730 mg/kg/2Y-C
TOXIC EFFECTS :
Biochemical - Enzyme inhibition, induction, or change in blood or tissue levels - true cholinesterase
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
21840 ug/kg/28D-I
TOXIC EFFECTS :
Kidney, Ureter, Bladder - changes in tubules (including acute renal failure, acute tubular necrosis) Blood - changes in serum composition (e.g. TP, bilirubin, cholesterol) Biochemical - Enzyme inhibition, induction, or change in blood or tissue levels - true cholinesterase
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
800 mg/kg/8W-I
TOXIC EFFECTS :
Sense Organs and Special Senses (Eye) - miosis (pupillary constriction) Behavioral - somnolence (general depressed activity) Behavioral - tremor
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Mammal - dog
DOSE/DURATION :
2190 mg/kg/2Y-C
TOXIC EFFECTS :
Liver - changes in liver weight Biochemical - Enzyme inhibition, induction, or change in blood or tissue levels - true cholinesterase
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Bird - chicken
DOSE/DURATION :
980 mg/kg/2W-C
TOXIC EFFECTS :
Nutritional and Gross Metabolic - weight loss or decreased weight gain Related to Chronic Data - death
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Intraperitoneal
DOSE :
210 ug/kg
SEX/DURATION :
female 1-7 day(s) after conception
TOXIC EFFECTS :
Reproductive - Specific Developmental Abnormalities - Central Nervous System
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Intraperitoneal
DOSE :
4500 ug/kg
SEX/DURATION :
female 7-21 day(s) after conception
TOXIC EFFECTS :
Reproductive - Specific Developmental Abnormalities - Central Nervous System
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Subcutaneous
DOSE :
200 mL/kg
SEX/DURATION :
female 12 day(s) after conception
TOXIC EFFECTS :
Reproductive - Maternal Effects - other effects Reproductive - Specific Developmental Abnormalities - Central Nervous System
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Subcutaneous
DOSE :
50 mg/kg
SEX/DURATION :
female 12-19 day(s) after conception
TOXIC EFFECTS :
Reproductive - Maternal Effects - other effects Reproductive - Effects on Embryo or Fetus - other effects to embryo
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Subcutaneous
DOSE :
200 mg/kg
SEX/DURATION :
female 12-19 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Newborn - growth statistics (e.g.%, reduced weight gain) Reproductive - Effects on Newborn - behavioral
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
250 mg/kg
SEX/DURATION :
female 6-15 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Embryo or Fetus - fetotoxicity (except death, e.g., stunted fetus)
TYPE OF TEST :
Specific locus test
TYPE OF TEST :
Sex chromosome loss and nondisjunction

MUTATION DATA

TYPE OF TEST :
Sister chromatid exchange
TEST SYSTEM :
Rodent - mouse Cells - not otherwise specified
REFERENCE :
MUREAV Mutation Research. (Elsevier Science Pub. B.V., POB 211, 1000 AE Amsterdam, Netherlands) V.1- 1964- Volume(issue)/page/year: 279,165,1992 *** REVIEWS *** ACGIH TLV-Not classifiable as a human carcinogen DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 ACGIH TLV-TWA 0.2 mg/m3 (skin) DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 TOXICOLOGY REVIEW RREVAH Residue Reviews. (Springer-Verlag New York, Inc., Service Center, 44 Hartz Way, Secaucus, NJ 07094) V.1- 1962- Volume(issue)/page/year: 50,1,1974 TOXICOLOGY REVIEW RREVAH Residue Reviews. (Springer-Verlag New York, Inc., Service Center, 44 Hartz Way, Secaucus, NJ 07094) V.1- 1962- Volume(issue)/page/year: 46,1,1973 TOXICOLOGY REVIEW RREVAH Residue Reviews. (Springer-Verlag New York, Inc., Service Center, 44 Hartz Way, Secaucus, NJ 07094) V.1- 1962- Volume(issue)/page/year: 63,1,1976 *** U.S. STANDARDS AND REGULATIONS *** EPA FIFRA 1988 PESTICIDE SUBJECT TO REGISTRATION OR RE-REGISTRATION FEREAC Federal Register. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) V.1- 1936- Volume(issue)/page/year: 54,7740,1989 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-AUSTRALIA:TWA 0.2 mg/m3;STEL 0.6 mg/m3;Skin JAN 1993 OEL-BELGIUM:TWA 0.2 mg/m3;STEL 0.6 mg/m3;Skin JAN 1993 OEL-DENMARK:TWA 0.2 mg/m3;Skin JAN 1993 OEL-FINLAND:TWA 0.2 mg/m3;STEL 0.6 mg/m3;Skin JAN 1993 OEL-FRANCE:TWA 0.2 mg/m3;Skin JAN 1993 OEL-THE NETHERLANDS:TWA 0.2 mg/m3;Skin JAN 1993 OEL-SWITZERLAND:TWA 0.2 mg/m3;Skin JAN 1993 OEL-UNITED KINGDOM:TWA 0.2 mg/m3;STEL 0.6 mg/m3;Skin JAN 1993 OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO CHLORPYRIFOS-air:10H TWA 0.2 mg/m3;STEL 0.6 mg/m3 (Sk) REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992 NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOHS - National Occupational Hazard Survey (1974) NOHS Hazard Code - M4463 No. of Facilities: 753 (estimated) No. of Industries: 1 No. of Occupations: 3 No. of Employees: 22523 (estimated) NOHS - National Occupational Hazard Survey (1974) NOHS Hazard Code - T0714 No. of Facilities: 7 (estimated) No. of Industries: 1 No. of Occupations: 1 No. of Employees: 7 (estimated) NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - M4463 No. of Facilities: 1276 (estimated) No. of Industries: 4 No. of Occupations: 3 No. of Employees: 11404 (estimated) No. of Female Employees: 842 (estimated)

 Safety Information

Symbol GHS06 GHS09
GHS06, GHS09
Signal Word Danger
Hazard Statements H301-H410
Precautionary Statements P273-P301 + P310 + P330-P391-P501
Personal Protective Equipment Eyeshields;Faceshields;full-face respirator (US);Gloves;multi-purpose combination respirator cartridge (US);type ABEK (EN14387) respirator filter
Hazard Codes T;N
Risk Phrases R25;R50/53
Safety Phrases S1/2-S45-S60-S61-S36/37-S26
RIDADR UN 2783
RTECS TF6300000
Packaging Group III
Hazard Class 6.1(b)
HS Code 2933399021

 Synthetic Route

2,3,5,6-Tetrachloropyridine structure

2,3,5,6-Tetrach...

CAS#:2402-79-1

potassium pyridine-2-carboxylate structure

potassium pyrid...

CAS#:25108-36-5

Diethyl chlorothiophosphate structure

Diethyl chlorot...

CAS#:2524-04-1

~%

Clorpyrifos Structure

Clorpyrifos

CAS#:2921-88-2

Literature: The Dow Chemical Company Patent: US4814448 A1, 1989 ;

 Customs

HS Code 2933399021
Summary 2933399021 (r)-2-(4-((5-(trifluoromethyl)pyridin-2-yl)oxy)phenoxy)propanoic acid。supervision conditions:s(import or export registration certificate for pesticides)。VAT:17.0%。tax rebate rate:9.0%。MFN tarrif:6.5%。general tariff:20.0%

 Articles103

More Articles
Vortex-assisted low density solvent liquid-liquid microextraction and salt-induced demulsification coupled to high performance liquid chromatography for the determination of five organophosphorus pesticide residues in fruits.

Talanta 132 , 769-74, (2014)

A simple and rapid microextraction method, vortex-assisted low density solvent liquid-liquid microextraction and salt-induced demulsification (VLLME-SID) coupled to high performance liquid chromatogra...

Simultaneous extraction and determination of various pesticides in environmental waters.

J. Sep. Sci. 37(24) , 3699-705, (2014)

A simple and rapid method was developed for the simultaneous analysis of nine different pesticides in water samples by gas chromatography with mass spectrometry. A number of parameters that may affect...

Haloalkylphosphorus hydrolases purified from Sphingomonas sp. strain TDK1 and Sphingobium sp. strain TCM1.

Appl. Environ. Microbiol. 80(18) , 5866-73, (2014)

Phosphotriesterases catalyze the first step of organophosphorus triester degradation. The bacterial phosphotriesterases purified and characterized to date hydrolyze mainly aryl dialkyl phosphates, suc...

 Synonyms

DURSBAN
Chlorpyrifos
0,0-Diethyl-O-[3,5,6-trichloro-2-pyridyl]phosphorothioate
suSCon
Empire
Brodan
Equity
Clorpyrifos
Eradex
O,O-diethyl O-(3,5,6-trichloropyridin-2-yl) phosphorothioate
O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl) phosphorothioate
Chlorpyrifos,Chlorpyriphos
Pyrine
chlopyrifos
chloropyrifos
chlorpyriphos-ethyl
MFCD00041800
O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate
DOWCO
Chlorpyriphos
Zidil
CUGAT
EINECS 220-864-4
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