dimethoate
98%, 96%tech, 40%ec,
Insecticide, acaricide
organophosphorus
NOMENCLATURE
Common name dimethoate (BSI, E-ISO, (m) F-ISO, ANSI, ESA, JMAF); fosfamid (USSR)
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] EEC no. 200-480-3 Development codes EI 12 880 (Cyanamid); L 395 (Montedison); BAS 152J (BASF) Official codes OMS 94; OMS 111; ENT 24 650
PHYSICAL CHEMISTRY
Composition Tech. grade is 95% 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 ¡ãC) KOW logP = 0.704 Henry 1.2 ´ 10-6 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.
|
product name |
dimethoate 98% tc |
dimethoate 40% ec |
|
a.i.content |
98.2% |
40.3% |
|
acidity: |
0.1% |
0.2% |
|
water |
0.2% |
0.3% |
|
appearance |
|
light-yellow transparent liquid |
|
emulsion stability |
|
qualified |
