Ramban (Chlorpyrifos 20% Ec)

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NOMENCLATURE
Common name chlorpyrifos (BSI, E-ISO, ANSI, ESA, BAN); chlorpyriphos ((m) F-ISO, JMAF); chlorpyriphos-ACthyl ((m) France)
IUPAC name O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate
Chemical Abstracts name O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl) phosphorothioate
CAS RN [2921-88-2] EEC no. 220-864-4 Development codes Dowco 179 (Dow) Official codes OMS 971; ENT 27 311

PHYSICAL CHEMISTRY
Mol. wt. 350.6 M.f. C9H11Cl3NO3PS Form Colourless crystals, with a mild mercaptan odour. M.p. 42-43.5 A C V.p. 2.7 mPa (25 A C) KOW logP = 4.7 Henry 6.76 A' 10-1 Pa m3 mol-1 (calc.) S.g./density 1.44 (20 A C) Solubility In water c. 1.4 mg/l (25 A C). In benzene 7900, acetone 6500, chloroform 6300, carbon disulfide 5900, diethyl ether 5100, xylene 5000, iso-octanol 790, methanol 450 (all in g/kg, 25 A C). Stability Rate of hydrolysis increases with pH, and in the presence of copper and possibly of other metals that can form chelates; DT50 1.5 d (water, pH 8, 25 A C) to 100 d (phosphate buffer, pH 7, 15 A C).

APPLICATIONS
Biochemistry Cholinesterase inhibitor. Mode of action Non-systemic insecticide with contact, stomach, and respiratory action. Uses Control of Coleoptera, Diptera, Homoptera and Lepidoptera in soil or on foliage in over 100 crops, including pome fruit, stone fruit, citrus fruit, nut crops, strawberries, figs.