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## 1,3-DioxolaneCAS RN:646-06-0
## Environmental FateTERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 15(SRC), determined from a log Kow of -0.37(2) and a regression-derived equation(3), indicates that 1,3-dioxolane is expected to have very high mobility in soil(SRC). Volatilization of 1,3-dioxolane from moist soil surfaces is expected to be an important fate process(SRC) given a Henry's Law constant of 2.45X10-5 atm-cu m/mole(4). 1,3-Dioxolane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 79 mm Hg(5). Biodegradation data were not available(SRC, 2006). AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 15(SRC), determined from a log Kow of -0.37(2) and a regression-derived equation(3), indicates that 1,3-dioxolane is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon a Henry's Law constant of 2.45X10-5 atm-cu m/mole(4). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 33 hours and 13 days, respectively(SRC). The aquatic oxidation rate for the reaction of 1,3-dioxolane with photochemically produced hydroxyl radicals has been experimentally determined to be 4.0X10+9 L/mol-s (pH not stated)(5). Based on this rate and a hydroxyl radical concn of 1X10-17 mol/L in water under continuous sunlight(6), the half-life for the aquatic oxidation of 1,3-dioxolane can be estimated to be 200 days(SRC). According to a classification scheme(7), an estimated BCF of 3(SRC), from its log Kow(2) and a regression-derived equation(8), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation data were not available(SRC, 2006). ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1,3-dioxolane, which has a vapor pressure of 79 mm Hg at 20 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 1,3-dioxolane 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 37 hours(SRC), calculated from its rate constant of 1.04X10-11 cu cm/molecule-sec at 25 deg(3). |