Diazinon

TC & FORMULATION: 95%TC, 50%EC, 60%EC, 5%GR

Structure Formula:  

NOMENCLATURE

Common name diazinon (BSI, E-ISO, (m) F-ISO, ANSI, ESA, BAN, JMAF); dimpylate (INN)

IUPAC name O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate 

Chemical Abstracts name O,O-diethyl O-[6-methyl-2-(1-methylethyl)-4-pyrimidinyl] phosphorothioate 

CAS RN [333-41-5]  EEC no. 206-373-8 

PHYSICAL CHEMISTRY

Composition Tech. is ³95% pure.  Mol. wt. 304.3  M.f. C12H21N2O3PS  Form Clear colourless liquid; (tech., yellow liquid).  B.p. 83-84 ºC/0.0002 mmHg; 125 ºC/1 mmHg  V.p. 1.2 ´ 101 mPa (25 ºC) (OECD 104)  KOW logP = 3.30 (OECD 107)  Henry 6.09 ´ 10-2 Pa m3 mol-1 (calc.)  S.g./density 1.11 (20 ºC)  Solubility In water 60 mg/l (20 ºC). Completely miscible with common organic solvents, e.g. ethers, alcohols, benzene, toluene, hexane, cyclohexane, dichloromethane, acetone, petroleum oils.  Stability Susceptible to oxidation above 100 ºC. Stable in neutral media, but slowly hydrolysed in alkaline media, and more rapidly in acidic media; DT50 (20 ºC) 11.77 h (pH 3.1), 185 d (pH 7.4), 6.0 d (pH 10.4). Decomposes above 120 ºC.  pKa 2.6 (OECD 112)  F.p. ³62 °C 

APPLICATIONS

Biochemistry Cholinesterase inhibitor.  Mode of action Non-systemic insecticide and acaricide with contact, stomach, and respiratory action.  Uses Control of sucking and chewing insects and mites on a very wide range of crops, including deciduous fruit trees, citrus fruit, vines, olives, bananas, pineapples, vegetables, potatoes, beet, sugar cane, coffee, cocoa, tea, tobacco, maize, sorghum, alfalfa, flax, cotton, rice, ornamentals, glasshouse crops, forestry, etc., at 300-600 g/ha; soil insects (by soil application); phorid and sciarid flies in mushroom cultivation; flies, lice, mites, fleas, cockroaches, bedbugs, ants, and other insect pests in animal houses and household use. Seed treatment for maize, for control of frit flies and also conferring bird-repellent properties. Also used as a veterinary ectoparasiticide. Phytotoxicity Non-phytotoxic when used as directed. Russetting may occur on green and yellow apple varieties.  Formulation types CS; EC; DP; DS; FT; GR; KN; SD; WP; Aerosol; Coating agent.  Compatibility Incompatible with copper-containing compounds.

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