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Methomyl Page 5 of 7 <br /> Recovery Act(RCRA) <br /> ` Methomyl is a white crystalline solid with a slight sulfurous odor(16).Liquid formulations are flammable and should be <br /> kept away from heat,sparks,and open flames(2).When heated to decomposition or combustion,methomyl emits very <br /> toxic fumes of nitrogen oxides,sulfur oxides and hydrogen cyanide.Explosion may occur if methomyl confined in <br /> containers is heated above 136 degrees C(18,27 2_8).Methomyl will auto ignite at temperatures at or above 290 degrees <br /> �., C(29).Methomyl is stable under normal temperatures and storage conditions(27 28).It is stable in aqueous neutral <br /> suspensions and solutions,but hydrolyses in alkaline media(8J.Aqueous methomyl solutions are non corrosive <br /> Microcoulometric gas chromatography is recommended for residue detection(1). <br /> Occupational Exposure Limits: <br /> ` OSHA: 2.5 mg/m3 TWA <br /> ACGIH: 2.5 mg/m3 TWA <br /> NIOSH: 2.5 mg/m3 recommended TWA <br /> r <br /> Physical Properties: <br /> CAS#: 16752-77-5 <br /> H2O solubility: 5,800 ppm;5.8%at 25 degrees C(1 t6;5.8 g/100 g(2);58,000 mg/1(58 g/1)(2 <br /> Solubility in other soluble in methanol,acetone,ethanol,isopropanol(16);73 g/100 g acetone,22 g/100 g <br /> solvents: isopropanol,3 g/100 g toluene(8) <br /> Melting point: 172 degrees F(78 degrees C)(1J <br /> Vapor pressure: 5 x 10 to the minus 5 power Torr at 25 degrees C(1) <br /> log Kow: -3.24(12);=2.38(IQ);=0.69(23) <br /> Koc: 160(23);27(calculated)(23);log Koc:2.63(10);=0.38(12) <br /> Kd: approximately equal to two,assuming that adsorption is described by a linear isotherm,and <br /> therefore equal to one(24). <br /> Chemical Class/Use: carbamate insecticide,nematicide,and acaricide. <br /> BASIC MANUFACTURER <br /> ` E.I.DuPont de Nemours and Co.,Inc. <br /> Agricultural Products Company <br /> DuPont Building <br /> Wilmington,DE 19898 <br /> r <br /> Review by Basic Manufacturer: <br /> Comments solicited:October, 1992 <br /> Comments received:November, 1992 <br /> REFERENCES <br /> 1. American Conference of Governmental Industrial Hygienists,Inc. 1986.Documentation of the threshold limit <br /> values and biological exposure indices.Fifth edition.Cincinnati,OH:Publications Office,ACGIH. <br /> 2. Berg,G.L.,ed. 1986.Farm chemicals handbook_Willoughby,OH:Meister Publishing Company. <br /> 3. Chemical&Pharmaceutical Press. 1987.Crop protection chemicals reference.Third edition.NY:John Wiley& <br /> ` Sons. <br /> 4. Cornell University. 1987. 1988 New York State pesticide recommendations.Forty-ninth annual pest control <br /> conference.Nov.9, 10, 11.Ithaca,NY. <br /> 5. DuPont de Nemours and Company. 1983.Technical data sheet for methomyl.Agricultural Chemicals Department. <br /> r Wilmington,DE:DuPont. <br /> 6. Gosselin,R. E.,et al. 1984.Clinical toxicology of commercial products.Fifth edition.Baltimore,MD:Williams <br /> and Wilkins. <br /> http://prep.cce.comell.edu/profiles/extoxnet/haloxyfop-methy1parathion/methomyl-ext.himl 1/2/2004 <br />