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Common NameDimethoate
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中文通用名乐果
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IUPACO,O-dimethyl S-methylcarbamoylmethyl phosphorodithioate
or
2-dimethoxyphosphinothioylthio-N-methylacetamide -
CASO,O-dimethyl S-[2-(methylamino)-2-oxoethyl] phosphorodithioate
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CAS No.60-51-5
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Molecular FormulaC5H12NO3PS2
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Molecular Structure
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Category
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ActivityAcaricide/Miticide, insecticide
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PremixLambda-cyhalothrin+dimethoate
Imidacloprid+dimethoate
Fenvalerate+dimethoate
Fenpropathrin+dimethoate
Endosulfan+dimethoate
Deltamethrin+dimethoate
Cypermethrin+dimethoate
Aerosol spray, dust, emulsifiable concentrate, ULV concentrate. Premix Parters: iprodione.
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Physical PropertiesMolecular weight:229.3. Physical form:Colourless crystals, mercaptan odor,( tech., white to greyish crystals). Density:1.277 at 65 °C; Composition:Tech. grade is 95% pure. Melting point:49 °C; ( tech., 43-45 °C); Vapour pressure:0.25 mPa (25 °C); Henry constant:1.2×10-6 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 0.704; Solubility:In water 23.3 ( pH 5), 23.8 ( pH 7), 25.0 ( pH 9) (all in g/l, 20 °C). Readily soluble in most organic solvents, e.g. in alcohols, ketones, benzene, toluene, chloroform, dichloromethane >300, carbon tetrachl. Stability: Relatively stable in aqueous media at pH 2-7. Hydrolysed in alkaline solutions; DT50 12 d ( pH 9). Decomposes on heating, forming the O,S-dimethyl analogue. Highly soluble in chloroform, methylene chloride, benzene, toluene, alcohols, esters, ketones. Slightly in xylene, carbon tetrachloride, aliphatic hydrocarbons.
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ToxicologyOral:Acute oral
LD50 for rats 387 mg/kg, mice 160 mg/kg, rabbits 300 mg/kg, guinea pigs 350 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin (rabbits). Inhalation: LC50 (4 h) for rats >1.6 mg/l air. Phytotoxicity:Non-phytotoxic when used as directed, except to some varieties of lemon, peach, fig, olive, walnut, hop, tomato, bean, cotto -
Environmental ProfileEcotoxicology:
Algae:EC50 (72 h) for Selenastrum capricornutum 282.3 mg/l; NOEC (72 h) 30.5 mg/l.Bees:Toxic to bees. LD50 (oral and topical) 0.1-0.2 µg/bee.Birds:Acute oral LD50 for male pheasants 15, quail 84, chickens 108, female mallard ducks 40 mg/kg.Daphnia: LC50 (24 h) 4.7 mg/l; NOEC (24 h) 1 mg/l.Fish: LC50 (96 h) for mosquito fish 40-60, rainbow trout 6.2, bluegill sunfish 6 mg/l.
Environmental fate:
Dimethoate degrades with short half-life in soil, water and plants. When used correctly, exposure of the population through air, food or water is negligible.Animals:In mammals, metabolism follows the same pattern as in plants.Soil:Adsorption and desorption constants have been shown to be a linear function of soil silt content.Koc ranges from 16.25 (sandy loam) to 51.88 (sand/loamy sand). Aerobic DT50 2-4.1 d. Plant:In plants, oxidised to O,O-dimethyl-phosphorothioate and hydrolysed to O,O-dimethyl-phosphorodithioate, -phosphorothioate, and -phosphate. The ester group is demethylated and the methylamino group is hydrolytically cleaved.
WATER SOLUBILITY: 2.5% at 21°C. -
Transport InformationSignal Word:WARNING; Hazard Class:II (Moderately hazardous)
Porduct NewsMore
France will not grant any exemption to use dimethoate for protecting cherries
New Zealand suspends imports of melons treated with dimethoate
Insecticide dimethoate declared safe by APVMA
EFSA recommends to withdraw dimethoate's authorisations on some crops
France limits the cherry import from nine countries
France to ban cherry imports with dimethoate
EFSA proposes ‘comprehensive review’ of MRLs for dimethoate
Australia extends insecticide dimethoate suspension
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