Vinyl methyl ether

CAS RN:107-25-5

Environmental Fate

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 5(SRC), determined from a structure estimation method(2), indicates that vinyl methyl ether is expected to have very high mobility in soil(SRC). Volatilization of vinyl methyl ether from moist soil surfaces is expected(SRC) given an estimated Henry's Law constant of 3.9X10-3 atm-cu m/mole(SRC) based upon its vapor pressure, 1316 mm Hg(3), and water solubility, 15,000 mg/L(4). Vinyl methyl ether is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(3). Biodegradation data in soil were not available(SRC, 2018).
AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 5(SRC), determined from a structure estimation method(2), indicates that vinyl methyl ether is not 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 3.9X10-3 atm-cu m/mole(SRC) derived from its vapor pressure, 1316 mm Hg(4), and water solubility, 15,000 mg/L(5). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 2 hours and 3 days, respectively(SRC). Vinyl methyl ether is expected to undergo hydrolysis in the environment based on hydrolysis half-lives of 9.5 hours, 40 days and 10.9 years at pH 5, 6 and 9, respectively, in structurally similar butyl vinyl ether(6). According to a classification scheme(7), an estimated BCF of 3(SRC), from an estimated log Kow of 0.42(2) and a regression-derived equation(2), suggests the potential for bioconcentration in aquatic organisms is low. Biodegradation data in water were not available(SRC, 2018).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), vinyl methyl ether, which has a vapor pressure of 1316 mm Hg at 25 deg C(2), is expected to exist solely as a gas in the ambient atmosphere. Gas-phase vinyl methyl ether is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals and ozone(SRC); the half-lives for these reactions in air are estimated to be 11 hours and 1.3 days(SRC), calculated from its respective rate constants of 3.35X10-11(3) and 8.8X10-16(4) cu cm/molecule-sec. Vinyl methyl ether does not absorb at wavelengths >290 nm(5) and, therefore, is not expected to be susceptible to direct photolysis by sunlight(SRC).
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