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Common name: Chlorpyrifos
IUPAC name: O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate 
Chemical Abstracts name: O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl phosphorothioate 
CAS RN: [2921-88-2]
Mol. wt.: 350.6 
M.f.: C9H11Cl3NO3PS 
Form: Colourless crystals, with a mild mercaptan odour. 
M.p.: 42-43.5 ºC 
V.p.: 2.7 mPa (25 ºC) 
KOW logP = 4.7 
Henry: 6.76X10-1 Pa mmol-1 (calc.) 
S.g./density: 1.44 (20 °C) 
Solubility In water c. 1.4 mg/l (25 ºC). In benzene 7900, acetone 6500, chloroform 6300, carbon disulfide 5900, diethyl ether 5100, xylene 5000, iso-octanol 790, methanol 450 (all in g/kg, 25 ºC). 
Stability Rate of hydrolysis increases with pH, and in the presence of copper and possibly of other metals that can form chelates; DT50 1.5 d (water, pH 8, 25 ºC) to 100 d (phosphate buffer, pH 7, 15 ºC). 
Oral Acute oral LD50 for rats 135-163, guinea pigs 504, rabbits 1000-2000 mg/kg. 
Skin and eye Acute percutaneous LD50 for rabbits >5000 mg/kg; (tech.) for rats >2000 mg/kg. 
Inhalation LC50 (4-6 h) for rats >0.2 mg/l (14 ppb). 
NOEL (2 y) for rats 1 mg/kg b.w. daily; (18 mo) for mice 0.7 mg/kg b.w. daily; (2 y) for dogs 1 mg/kg b.w. daily.  
ADI  (JMPR) 0.01 mg/kg b.w.].  Other Non-teratogenic.
Toxicity class WHO (a.i.) II;  
EPA (formulation) II   
EC hazard T; R24/25| N; R50, R53 
Birds Acute oral LD50 for mallard ducks 490, house sparrows (Passer domesticus) 122, chickens 32-102 mg/kg.
Dietary LC50 (8 d) for bobwhite quail 423 ppm. 
Fish LC50 (96 h) for bluegill sunfish 0.002-0.010, rainbow trout 0.007-0.051, roach 0.25, fathead minnow 0.12-0.54 mg/l. 
Daphnia LC50 (48 h) 1.7 mg/l.
Algae NOEC for Selenastrum capricornutum >0.4 mg/l.
Other aquatic spp. LC50 for Korean shrimp (Palaemon macrodactylus) 0.05 mg/l.
Bees Toxic to bees. LD50 (oral) 360 ng/bee; (contact) 70 ng/bee. 
Worms LC50 (14 d) for Eisenia foetida 210 mg/kg soil.


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