Page Views: 268 Date Added: 05/18/2010 Last Updated: 05/18/2010 Expiry Date: 05/13/2029 Product/Service Details Common name: dimethoate; fosfamid IUPAC name: O,O-dimethyl S-methylcarbamoylmethyl phosphorodithioate; 2-dimethoxyphosphinothioylthio-N-methylacetamide Chemical Abstracts name: O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] phosphorodithioate CAS RN: [60-51-5] PHYSICAL CHEMISTRY Composition: Tech. grade is 98% pure. Mol. wt.: 229.3; M.f.: C5H12NO3PS2; Form: Colourless crystals; (tech., white to greyish crystals). M.p.: 49 ºC; (tech., 43-45 ºC). B.p.: 117 ºC/0.1 mmHg V.p.: 0.25 mPa (25 °C). KOW: logP = 0.704; Henry: 1.2x10-6 Pa m3 mol-1 S.g./density: 1.277 at 65 ºC. Solubility: In water 23.3 (pH 5), 23.8 (pH 7), 25.0 (pH 9) (all in g/l, 20 ºC). Readily soluble in most organic solvents, e.g. in alcohols, ketones, benzene, toluene, chloroform, dichloromethane >300, carbon tetrachloride, saturated hydrocarbons, n-octanol >50 (all in g/kg, 20 ºC). 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. APPLICATIONS Biochemistry: Cholinesterase inhibitor. Mode of action: Systemic insecticide and acaricide with contact and stomach action. Uses: Control of a wide range of Acari, Aphididae, Aleyrodidae, Coccidae, Coleoptera, Collembola, Diptera, Lepidoptera, Pseudococcidae and Thysanoptera in cereals, citrus, coffee, cotton, fruit, grapes, olives, pastures, beetroot, potatoes, pulses, tea, tobacco, and vegetables. Also used for control of flies in animal houses. Phytotoxicity: Non-phytotoxic when used as directed, except to some varieties of lemon, peach, fig, olive, walnut, hop, tomato, bean, cotton, and pine. Russetting is possible with Red Delicious and Golden Delicious apples, and with some ornamentals. Formulation types: EC; GR; UL; WP; Aerosol. Compatibility: Incompatible with alkaline materials and with sulfur-based formulations. MAMMALIAN TOXICOLOGY Oral: Acute oral LD50 for rats 387, mice 160, rabbits 300, guinea pigs 350 mg/kg. Skin and eye: Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin (rabbits). Inhalation: LC50 (4 h) for rats >1.6 mg/l air. NOEL: (2 y) for rats 5.0 mg/kg diet (0.2 mg/kg daily). ADI: 0.002 mg/kg b.w. (sum of dimethoate and omethoate, expressed as dimethoate). Toxicity class: WHO (a.i.) II; EPA (formulation) II EC hazard: Xn; R21/22 ECOTOXICOLOGY Birds: Acute oral LD50 for male pheasants 15, quail 84, chickens 108, female mallard ducks 40 mg/kg. Fish: LC50 (96 h) for mosquito fish 40-60, rainbow trout 6.2, bluegill sunfish 6 mg/l. Daphnia: LC50 (24 h) 4.7 mg/l; NOEC (24 h) 1 mg/l. 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 ug/bee. ENVIRONMENTAL FATE EHC: 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. Plants: 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. Oxidation of dimethoate gives the corresponding oxone (omethoate q.v.), which is classified as toxic and a strong cholinesterase inhibitor, and which appears to show similar rapid degradation in environmental compartments as dimethoate. Soil/Environment: 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. Photolytic DT50 on soil surface 7-16 d. Low potential for leaching to groundwater because of rapid degradation in soil.

Dimethoate

Company Information (Shanghai Skyblue Chemical Co., Ltd.)

Company Profile: Shanghai Skyblue Chemical Co., Ltd. is an integrated company located in Pudong New Area of Shanghai China. Our business scopes include the development, manufacturing, researching, and marketing agrochemicals. We are capable of supplying a wide range of high quality agrochemicals, including insecticides (especially household and public health insecticides), fungicides, herbicides, pesticide synergists and other relative agrochemicals in both technical grade and formulation in different packages as per customer's requirements. To make quality products is our credo. We always target to provide our customers with top quality products along with moderate prices and professional services, and endeavor to be a 360o-solution supplier for agrochemicals. Currently our products are being exported to more than twenty countries and enjoy high reputation in the global market. On the basis of equality and mutual benefits, we always look forward to establishing and maintaining long term partnerships with all customers toward a future of resplendence. At present we can supply the following products: Insecticides: Acetamiprid,Alpha-Cypermethrin, Aluminium Phosphide, Azamethiphos, Beta-Cyfluthrin, Bifenthrin, Bioallethrin, Carbaryl, Carbofuran, Carbosulfan, Cartap, Chlorpyrifos, Cyfluthrin, D-Allethrin, D-Cyphenothrin, Deltamethrin, Dichlorvos, Diethyltoluamide, Dimehypo, Dimethoate, D-Phenothrin, D-Tetramethrin, Empenthrin, Es-bioallethrin, Es-Fenvalerate, Etofenprox, Fenitrothion, Fenpropathrin, Fenthion, Fenvalerate, Fipronil, Flumethrin, Hydramethylnon, Imidacloprid, Imiprothrin, Lambda-cyhalothrin, Malathion, Permethrin, Pirimiphos-methyl, Prallethrin, Propoxur, S-Bioallethrin, Tefluthrin, Tetramethrin, Thiocyclam, Transfluthrin Fungicides: Clofentezine, Difenoconazole, Mancozeb, Metiram, Propiconazole, Propineb, Tebuconazole, Thiabendazole Herbicides: Acetochlor, Ametryn, Atrazine, Bensulfuron-methyl, Butachlor, Chlorimuron-ethyl, Chlorsulfuron, Cyanazine, Fenchlorazole, Fenoxaprop-p-ethyl, Glyphosate, Metsulfuron-methyl, Nicosulfuron, Prometryn, Pyrazosulfuron-ethyl, Quinclorac, Quizalofop-p-ethyl, Simazine, Simetryn, Terbuthylazine, Terbutryn, Tribenuron-methyl Pesticide Synergists: Piperonyl Butoxide, MGK 264. >> More Website URL: http://www.bridgat.com/u15636