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{TOXNET PIP-CARBARYL. '-"p://ace.orst.edu/cgi-bin/int's/0I/pips/carbaryl.htm <br /> Environmental Fate: <br /> • Breakdown in soil and groundwater: Carbaryl has a low persistence in soil. Degradation of <br /> carbaryl in the soil is mostly due to sunlight and bacterial action. It is bound by organic matter and <br /> can be transported in soil runoff. Carbaryl has a half-life of 7 to 14 days in sandy loam soil and 14 <br /> to 28 days in clay loam soil. Carbaryl has been detected in groundwater in three separate cases in <br /> California [14]. <br /> • Breakdown in water: In surface water, carbaryl is broken down by bacteria and through <br /> hydrolysis. Evaporation is very slow. Carbaryl has a half-life of about 10 days at neutral pH. The <br /> half-life varies greatly with water acidity [14]. <br /> • Breakdown in vegetation: Degradation of carbaryl in crops occurs by hydrolysis inside the plants. <br /> It has a short residual life of less than 2 weeks. The metabolites of carbaryl have lower toxicity to <br /> humans than carbaryl itself. The breakdown of this substance is strongly dependent on acidity and <br /> temperature [8]. <br /> Physical Properties: <br /> • Appearance: Carbaryl is a solid that varies from colorless to white or gray, depending on the purity <br /> of the compound. The crystals are odorless. Carbaryl is stable to heat, light, and acids. It is not <br /> stable under alkaline conditions. It is noncorrosive to metals, packaging materials, and application <br /> equipment. <br /> • Chemical Name: 1-napthyl methylcarbamate [10] <br /> • CAS Number: 63-25-2 <br /> • Molecular Weight: 201.23 <br /> • Water Solubility: 40 mg/L @ 30 C [10] <br /> • Solubility in Other Solvents: dimethylformaldehyde v.s; acetone s.; dimethyl sulfoxide v.s.; <br /> cyclohexanone s. [10] <br /> • Melting Point: 142 C [10] <br /> • Vapor Pressure: <5.3 mPa @ 25 C [10] <br /> • Partition Coefficient: Not Available <br /> • Adsorption Coefficient: 300 [10] <br /> Exposure Guidelines: <br /> • ADI: 0.01 mg/kg/day [10] <br /> • MCL: Not Available <br /> • RfD: 0.1 mg/kg/day [20] <br /> • PEL: 5 mg/m3 (8-hour) [31] <br /> • HA: 0.7 mg/L (lifetime) [24] <br /> • TLV: Not Available <br /> Basic Manufacturer: <br /> Rhone-Poulec Ag. Co. <br /> P.O. Box 12014 <br /> 2 T.W. Alexander Dr. <br /> Research Triangle Park,NC 27709 <br /> of 4 <br /> 5/12!00 1:54 PM <br />