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DDVP
Common name: dichlorvos
IUPAC name: 2,2-dichlorovinyl dimethyl phosphate 
Chemical Abstracts name: 2,2-dichloroethenyl dimethyl phosphate 
CAS RN: [62-73-7] 
EEC no.: 200-547-7 
 
PHYSICAL CHEMISTRY
Mol. wt.: 221.0 
M.f.: C4H7Cl2O4P 
Form: Colourless liquid; (tech., colourless-to-amber liquid, with an aromatic odour). 
B.p.: 234.1 ºC/1×105 Pa (OECD 103); 74 °C/1.3×102 Pa 
V.p.: 2.1×10mPa (25 ºC) (OECD 104) 
KOW: logP = 1.9 (OECD 117); 1.42 (separate study) 
Henry: 2.58×10-2 Pa m3 mol-1 
S.g./density: 1.425 (20 ºC) (OECD 109) 
Solubility: In water c. 18 g/l (25 ºC). Completely miscible with aromatic hydrocarbons, chlorinated hydrocarbons and alcohols; moderately soluble in diesel oil, kerosene, isoparaffinic hydrocarbons, and mineral oils. 
Stability: Stable to heat. Slowly hydrolysed in water and in acidic media, and rapidly hydrolysed by alkalis, to dimethyl hydrogen phosphate and dichloroacetaldehyde; DT50 (est.) 31.9 d (pH 4), 2.9 d (pH 7), 2.0 d (pH 9) (22 ºC). 
F.p.: >100 °C (DIN 51758); 172 °C (Pensky-Martens closed cup, 1×105 Pa) 
 
TOXICOLOGY
Oral: Acute oral LD50 for rats c. 50 mg/kg. 
Skin and eye: Acute percutaneous LD50 for rats c. 90 mg/kg. Slight skin and eye irritant (rabbits). 
Inhalation: LC50 (4 h) for rats 340 mg/m3; (1 h) for rats 455 mg/m3. 
NOEL: (2 y) for rats 10 mg/kg diet. 
ADI (JMPR) 0.004 mg/kg b.w. [1993]. 
Toxicity class WHO (a.i.) Ib; EPA (formulation) I 
EC hazard T R24/25 
 
ECOTOXICOLOGY
Birds Acute oral LD50 for bobwhite quail 24 mg/kg. Sub-acute oral LD50 (8 d) for Japanese quail 300 mg/kg. 
Fish LC50 (96 h) for rainbow trout 200, golden orfe 450 mg/l (both 500 EC). 
Daphnia LC50 (48 h) 0.19 mg/l. 
Algae EC50 (5 d) for Scenedesmus subspicatus 52.8 mg/l. 
Bees Acute oral LD50 0.29 mg/bee. 

 
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