| Umweltverhalten | TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 340(SRC), determined from a structure estimation method(2), indicates that 1,1,1,3,3,3-hexafluoropropane is expected to have moderate mobility in soil(SRC). Volatilization of 1,1,1,3,3,3-hexafluoropropane from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 3.5 atm-cu m/mole(SRC), using a fragment constant estimation method(2). 1,1,1,3,3,3-Hexafluoropropane is expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 1850 mm Hg at 25 °C(SRC), determined from a fragment constant method(2). Biodegradation data in soil were not available(SRC, 2016).AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 340(SRC), determined from a structure estimation method(2), indicates that 1,1,1,3,3,3-hexafluoropropane is expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 3.5 atm-cu m/mole(SRC), developed using a fragment constant estimation method(2). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 3.6 hours and 5 days, respectively(SRC). 1,1,1,3,3,3-Hexafluoropropane is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions(3). According to a classification scheme(4), an estimated BCF of 26(SRC), from an estimated log Kow of 2.65(2) and a regression-derived equation(2), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation data in water were not available(SRC, 2016).ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1,1,1,3,3,3-hexafluoropropane, which has an estimated vapor pressure of 1850 mm Hg at 25 °C(SRC), determined from a fragment constant method(2), is expected to exist solely as a gas in the ambient atmosphere. Gas-phase 1,1,1,3,3,3-hexafluoropropane is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC)the half-life for this reaction in air is estimated to be 110-260 years(SRC), calculated from rate constants of 1.7X10-16 to 4.08X10-16 cu cm/molecule-sec(3-6). Atmospheric life-times for 1,1,1,3,3,3-hexafluoropropane have been reported as 222-226 years(7). 1,1,1,3,3,3-Hexafluoropropane has estimated 20-, 100- and 500-year Global Warming Potentials of 6125, 6300-9400 and 5930, respectively(7-8). 1,1,1,3,3,3-Hexafluoropropane does not contain chromophores that absorb at wavelengths >290 nm(9) and, therefore, is not expected to be susceptible to direct photolysis by sunlight(SRC). |
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