| 환경 거동 | TERRESTRIAL FATE: Based on a classification scheme(1), Koc values of 40-148(2), indicate that n-butyl acrylate is expected to have very high to high mobility in soil(SRC). Volatilization of n-butyl acrylate from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 4.6X10-4 atm-cu m/mole(SRC), based upon its vapor pressure, 5.45 mm Hg(3), and water solubility, 2,000 mg/L(4). n-Butyl acrylate is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(3). Utilizing the Japanese MITI test 61.3% of the theoretical BOD was reached in 2 weeks(5) suggesting that biodegradation is an important environmental fate process in soil(SRC). n-Butyl acrylate had a theoretical BOD of 56% and 40% in other biodegradation tests using OECD methods(2).AQUATIC FATE: Based on a classification scheme(1), Koc values of 40-148(2), indicate that n-butyl acrylate 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 4.6X10-4 atm-cu m/mole(SRC), derived from its vapor pressure, 5.45 mm Hg(4), and water solubility, 2,000 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 5 hours and 5 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 17(SRC), from its log Kow of 2.36(7) and a regression-derived equation(8), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Hydrolysis is not expected to be an important process(SRC) based on estimated hydrolysis half-lives of 11 and 1.1 years at pHs 7 and 8, respectively(9). n-Butyl acrylate has experimental aquatic first-order photochemical degradation rates of 5.7X10-4, 5.9X10-4, 4.7X10-4, and 4.1X10-4/sec in distilled water, river water, artificial seawater, and seawater, respectively(10), corresponding to half-lives of 20 min, 19 min, 25 min, and 28 min, respectively(SRC). Utilizing the Japanese MITI test, 61.3% of the theoretical BOD was reached in 2 weeks(11), suggesting that biodegradation is an important environmental fate process in water(SRC).ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), n-butyl acrylate, which has a vapor pressure of 5.45 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase n-butyl acrylate 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 28 hours(SRC), calculated from its rate constant of 1.4X10-11 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(3). Vapor-phase n-butyl acrylate is also degraded in the atmosphere by reaction with ozone(SRC)the half-life for this reaction in air is estimated to be 7 hours(SRC), calculated from its rate constant of 1.8X10-18 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(3). Experimental photodegradation rates in distilled water, river water, artificial seawater, and seawater of 5.7X10-4, 5.9X10-4, 4.7X10-4, and 4.1X10-4/sec, respectively(4), which correspond to half-lives of 20 min, 19 min, 25 min, and 28 min, respectively(SRC), suggest that n-butyl acrylate may be susceptible to direct photolysis in sunlight(SRC). |
|---|
