马拉硫磷杀虫剂57%EC

Insecticide:Malathion 57% EC Composition Tech. grade is c. 95% pure. Mol. wt. 330.3 M.f. C10H19O6PS2 Form Tech. is a clear, amber liquid. M.p. 2.85 B.p. 156-157 /0.7 mmHg. V.p. 5.3 mPa (30 ) KOW logP = 2.75 Henry 1.21 ?10-2 Pa m3 mol-1 (calc.) S.g./density 1.23 (25 ) Solubility In water 145 mg/l (25 ). Miscible with most organic solvents, e.g. alcohols, esters, ketones, ethers, aromatic hydrocarbons. Slightly soluble in petroleum ether and some types of mineral oil. Stability Relatively stable in neutral, aqueous media. Decomposed by strong acids and by alkali; hydrolysis DT50 107 d (pH 5), 6 d (pH 7), 0.5 d (pH 9) (all 25 ); F.p. 163 (Pensky-Martens closed cup) Biochemistry Cholinesterase inhibitor; proinsecticide, activated by metabolic oxidative desulfuration to the corresponding oxon. Mode of action Non-systemic insecticide and acaricide with contact, stomach, and respiratory action. Uses Used control Coleoptera, Diptera, Hemiptera, Hymenoptera and Lepidoptera in a wide range of crops, including cotton, pome, soft and stone fruit, potatoes, rice and vegetables. Used extensively to control major arthropod disease vectors (Culicidae) in public health programmes, ectoparasites (Diptera, Acari, Mallophaga) of cattle, poultry, dogs and cats, human head and body lice (Anoplura), household insects (Diptera, Orthoptera), and for the protection of stored grain. Typical application rates for agricultural uses 0.5-1.25 kg/ha. Phytotoxicity Non-phytotoxic in general, if used as recommended, but glasshouse cucurbits and beans, certain ornamentals, and some varieties of apple, pear, and grape may be injured.