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;XTOXNET PIP - METHYL BROMIDE Page 3 of 4 . Breakdown-in soil and groundwater: Methyl bromide quickly evaporates at temperatures ordinarily encountered in fumigating, but some may be entrapped in soil micropores following application [11]. Methyl F bromide is moderately persistent in the soil environment, with a field half-life of between 30 and 60 days; a representative half-life is estimated to be about 55 days [11]. Transformation of rnethyl bromide into bromide increases as the amount of organic matter in the soil increases. It is soluble in water and very poorly sorbed by soils. Some leaching may occur if bromomethane is entrapped in soil micropores following fumigation; the rate of degradation for retained bromomethane in fumigated soil is 6 to 14%per day at 20 C [I I]. . rBreakdowtn in'water: Methyl bromide quickly evaporates at temperatures ordinarily encountered in fumigating; therefore run-off from fields into surface waters is very rare. If it does contact surface waters, the average half-life for methyl bromide under field conditions has been calculated to be 6.6 hours at 11 C [8]. Another study showed the half-life in water to be 20 days at 25 C in a neutral solution [8]. . Breakdown in vegetation: The amount of bromide ion (the metabolite of methyl bromide) taken up from the soil, is proportional to the protein content of crop. Higher levels of the bromide ion will most likely be found in high-protein plants [8]. Physical Properties: . Appearance: Methyl bromide is a colorless gas or volatile liquid which is usually odorless, but has a sweet, chloroform-like odor at high concentrations [1]. . Chemical Name: bromomethane [1] . CAS Number: 74-83-9 . Molecular Weight: 94.94 . Water Solubility: 13,400 mg/L at 25 C [1] Solubility in Other Solvents: easily miscible with ethanol, ether, aromatic carbon disulfide, and ketones [1] . Melting Point: -93.6 C [1] . Vapor Pressure: 227,000,000 mPa @ 25 C [1] . Partition Coefficient: Not Available . Adsorption Coefficient: 22 [11] Exposure Guidelines: . ADI:`1.0 mg/kg/day (as bromide ion) [12] . MCL: Not Available . RfD: 0.0014 mg/kg/day [13] . PEL: 80 mg/m3 (ceiling) [14] . HA: Not Available . TLV: Not Available Basic Manufacturer; Great Lakes Chemical Corporation One Great Lakes Blvd. P.O. Box 2200 West Lafayette, IN 47906 . Phone: 317-497-6204 . Emergency: 501-862-5141 References: References for the information in this PIP can be found in Reference List Number 10 DISCI A UVIEtt.: The information in this profile does not in any way replace or supersede the information on the