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EXTOXNET PIP-DIAZINON Page 3 of 4 <br /> *Ar'' ,./ <br /> . Breakdown in soil and groundwater: Diazinon has a low persistence in soil. The half-life is 2 to 4 weeks [19]. <br /> Bacterial enzymes can speed the breakdown of diazinon and have been used in treating emergency situations such <br /> as spills [12]. Diazinon seldom migrates below the top half inch in soil, but in some instances it may contaminate <br /> groundwater. The pesticide was detected in 54 wells in California and in tap water in Ottawa, Canada, and in Japan <br /> [121. <br /> . Breakdown in water: The breakdown rate is dependent on the acidity of water. At highly acidic levels, one half of <br /> the compound disappeared within 12 hours while in a neutral solution, the pesticide took 6 months to degrade to <br /> one half of the original concentration [12]. <br /> . Breakdown in vegetation: In plants, a low temperature and a high oil content tend to increase the persistence of <br /> diazinon [58]. Generally the half-life is rapid in leafy vegetables, forage crops and grass. The range is from 2 to 14 <br /> days. In treated rice plants only 10% of the residue was present after 9 days [58]. Diazinon is absorbed by plant <br /> roots when applied to the soil and translocated to other parts of the plant [13]. <br /> Physical Properties: <br /> . Appearance: Diazinon is a colorless to dark brown liquid. It has a flashpoint of 180 F [13]. <br /> . Chemical Name: 0,0-diethy10-2-isopropyl-6-methyl(pyrimidine-4-yl)phosphorothioate [13] <br /> . CAS Number: 333-41-5 <br /> . Molecular Weight: 304.35 <br /> . Water Solubility: 40 mg/L @ 20 C [13] <br /> . Solubility in Other Solvents: petroleum ether v.s.; alcohol v.s.; benzene v.s. [13] <br /> . Melting Point: Decomposes @>120 C [8] <br /> . Vapor Pressure: 0.097 mPa @ 20 C [13] <br /> . Partition Coefficient: Not Available <br /> . Adsorption Coefficient: 1000 (estimated) [19] <br /> Exposure Guidelines: <br /> . ADI: 0.002 mg/kg/day [38] <br /> . MCL:Not Available <br /> . RfD: 9 x 10-5 mg/kg/day [53] <br /> . PEL: Not Available <br /> . HA: 6 x 10-4 mg/L(lifetime) (8) <br /> . TLV: 0.1 mg/m3 (8-hour) [47] <br /> Basic Manufacturer: <br /> Ciba-Geigy Corp. <br /> P.O. Box 18300 <br /> Greensboro,NC 27419-8300 <br /> . Phone: 800-334-9481 <br /> . Emergency: 800-888-8372 <br /> References: <br /> References for the information in this PIP can be found in Reference List Number 5 <br /> http://extoxnet.orst.edu/pips/diazinon.htm <br />