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Common NameDichlorvos
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中文通用名敌敌畏
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IUPAC2,2-dichlorovinyl dimethyl phosphate
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CAS2,2-dichloroethenyl dimethyl phosphate
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CAS No.62-73-7
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Molecular FormulaC4H7Cl2O4P
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Molecular Structure
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Category
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ActivityInsecticide, acaricide, fumigant
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PremixImidacloprid+dichlorvos
Fenvalerate+dichlorvos
Dichlorvos+lambda-cyhalothrin
Dichlorvos+fenvalerate+phoxim
Dichlorvos+fenvalerate+omethoate
Dichlorvos+fenpropathrin
Dichlorvos+deltamethrin
Dichlorvos+beta-cypermethrin
Aerosols, emuslifable concentrate, multi-layered laminated strip (Hercon*). Premix Parters: dimethoate tetradifon; hexythiazox; tetradifon.
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Physical PropertiesMolecular weight:221.0; Physical form:Colourless liquid; ( tech., colourless-to-amber liquid, with an aromatic odour). Density:1.425 (20 °C) ( OECD 109),specific gravity 1.423. Flash point:>100 °C (DIN 51758); 172 °C (Pensky-Martens closed cup, 1×105 Pa). Boiling point 117°C/10 mm. Vapour pressure:2.1×103 mPa (25 °C) ( OECD 104). Henry constant:2.58×10-2 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 1.9 ( OECD 117); 1.42 (separate study); Solubility:In water c. 18 g/l (25 °C). 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 ( 4). Miscible in dichloromethane, 2-propanol, toluene. Barely soluble in kerosene. Hercon*: 10% DDVP present on surface and in inner reservoir of multi-layered, laminated polymeric strips.
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ToxicologyOral:Acute oral
LD50 for rats c. 50 mg/kg. Percutaneous: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. Phytotoxicity:Non-phytotoxic when used as directed, except to some varieties of chrysanthe -
Environmental ProfileEcotoxicology:
Algae:EC50 (5 d) for Scenedesmus subspicatus 52.8 mg/l.Bees:Acute oral LD50 0.29 µg/bee.Birds:Acute oral 50 for bobwhite quail 24 mg/kg. Sub-acute oral LD50 (8 d) for Japanese quail 300 mg/kg.Daphnia: LC50 (48 h) 0.19 µg/l.Fish: LC50 (96 h) for rainbow trout 200µg/l , golden orfe 450 µg/l (both 500 EC),bluegill 1.0 mg/l (24 h).
Environmental fate:
EHC review concludes that, with the exception of gross spillage, recommended use does not constitute a hazard for aquatic or terrestrial organisms. The high toxicity to birds and bees necessitates caution in use.Animals:In mammals, following oral administration, rapidly degraded in the liver by hydrolysis and O-demethylation, with a half-life of c. 25 minutes (D. L. Bull & R. L. Ridgway, J. Agric. Food Chem., 1969, 17, 837; D. Soil:Non-persistent in the environment, with rapid decomposition in the atmosphere. Undergoes hydrolysis in damp media, with the formation of phosphoric acid and CO2. But G. Keller et al. (Proc. 9th J. Agric. Food Chem., 1969, 17, 837).
WATER SOLUBILITY: Barely soluble. -
Transport InformationSignal Word:CAUTION; Hazard Class:Ib (Highly hazardous).
Porduct NewsMore
Argentina bans dichlorvos and trichlorfon
Argentina may ban dichlorvos and trichlorfon
Canada proposes continued registration for dichlorvos
New Zealand restricts insecticide dichlorvos
New Zealand proposes to restrict dichlorvos use
US EPA sought on dichlorvos reassessment
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