| 환경 거동 | TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 275(SRC), determined from a structure estimation method(2), indicates that 2,4,4-trimethyl-1-pentene is expected to have moderate mobility in soil(SRC). Volatilization of 2,4,4-trimethyl-1-pentene from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 0.75 atm-cu m/mole(SRC), using a fragment constant estimation method(3). The potential for volatilization of 2,4,4-trimethyl-1-pentene from dry soil surfaces may exist based upon a vapor pressure of 44.7 mm Hg(4). 2,2,4-Trimethyl-1-pentene is expected to biodegrade slowly in soil based upon no biodegradation in the Japanese MITI test(5).AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 275(SRC), determined from a structure estimation method(2), indicates that 2,4,4-trimethyl-1-pentene is not expected to adsorb to suspended solids and sediment in water(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 0.75 atm-cu m/mole(SRC), developed using a fragment constant estimation method(4). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 1.08 hr and 4.19 days, respectively(SRC). 2,2,4-Trimethyl-1-pentene is expected to biodegrade slowly in water based upon no biodegradation in the Japanese MITI test(7). According to a classification scheme(5), an estimated log BCF of 2.80(SRC), from a log Kow of 4.55(7) and a regression-derived equation(6), suggests the potential for bioconcentration in aquatic organisms is high.ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 2,4,4-trimethyl-1-pentene, which has a vapor pressure of 44.7 mm Hg at 25 °C(2), is expected to exist solely in a vapor-phase in the ambient atmosphere. Vapor-phase 2,4,4-trimethyl-1-pentene 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 0.3 hr(SRC), calculated from its estimated rate constant of 53.19X10-12 cu cm/molecule-sec at 25 °C(SRC), determined using a structure estimation method(3). The rate constant for the vapor-phase reaction of 2,2,4-trimethyl-1-pentene with ozone has been estimated as 1.2X10-17 cu cm/molecule-sec at 25 °C(3). This corresponds to an atmospheric half-life of about 23 hrs at an atmospheric concentration of 7X10+11 ozone molecules per cu cm(3). |
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