Chlorotrifluoromethane

CAS RN: 75-72-9

Exposure Summary

Chlorotrifluoromethane's production and use as a refrigerant or as an azeotrope with trifluoromethane for very low temperature applications may lead to its release to the environment through various waste streams. Based on a measured vapor pressure of 2.14X10+4 mm Hg at 25 deg C, chlorotrifluoromethane is expected to exist solely in the vapor-phase in the ambient atmosphere. Vapor-phase chlorotrifluoromethane is extremely stable in the troposphere. The half-life for the reaction of this compound with photochemically produced hydroxyl radicals is about 63 years. This compound will gradually diffuse into the stratosphere above the ozone layer where it will slowly degrade due to direct photolysis from UV-C radiation and contribute to the catalytic removal of stratospheric ozone. The half-life for this reaction has been estimated to range from 180 to 450 years. Chlorotrifluoromethane is expected to have moderate mobility in soils based upon an estimated Koc value of 188. This compound is expected to volatilize rapidly from dry soil surfaces based on its vapor pressure. Volatilization from moist soil surfaces is expected based upon the Henry's Law constant of 1.38 atm-cu m/mole. Biodegradation is not expected to be an important environmental fate process. In water, chlorotrifluoromethane is not expected to adsorb to sediment or particulate matter given its estimated Koc value. This compound is expected to volatilize rapidly from water surfaces given its Henry's Law constant. Estimated volatilization half-lives for a model river and model lake are 3 and 97 hours, respectively. Bioconcentration is expected to be low based upon an estimated BCF value of 10. Occupational exposure may be through inhalation and dermal contact with this compound at workplaces where chlorotrifluoromethane is produced or used. The general population is exposed to chlorotrifluoromethane through inhalation of ambient air. (SRC)
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