| 環境中動態 | TERRESTRIAL FATE: Based on a recommended classification scheme(1), an estimated Koc value of 8900(SRC), determined from a measured log Kow(2) and a recommended regression-derived equation(3), indicates that 1-chlorooctane will be immobile in soil(SRC). Volatilization of 1-chlorooctane may be important from moist soil surfaces(SRC) given an estimated Henry's Law constant of 6.0X10-2 atm-cu m/mole(SRC), using a fragment constant estimation method(4). The rate of this process may be attenuated based on the Koc value estimated for this compound(SRC). Volatilization from dry soil surfaces(SRC) is expected based on a measured vapor pressure of 0.95 mm Hg(5). Based on limited data, 1-chlorooctane is expected to readily biodegrade in soil under aerobic conditions(SRC). In an aerobic aqueous screening test, 1-chlorooctane, incubated with a sludge inoculum, reached 74-81% of the theoretical BOD in 4 weeks(6).AQUATIC FATE: Based on a recommended classification scheme(1), an estimated Koc value of 4.73(SRC), determined from a measured log Kow(2,SRC) and a recommended regression-derived equation(1), indicates that 1-chlorooctane should adsorb to suspended solids and sediment in water(SRC). 1-Chlorooctane may volatilize from water surfaces(1,SRC) based on an estimated Henry's Law constant of 6.0X10-2 atm-cu m/mole(SRC), developed using a fragment constant estimation method(3). Estimated half-lives for a model river and model lake are 4 hours and 5 days, respectively(1,SRC). Adsorption to sediment and particulate matter may attenuate the rate of this process(SRC). According to a classification scheme(4), an estimated BCF value of 2300(1,SRC), from a measured log Kow(2), suggests that bioconcentration in aquatic organisms is very high(SRC). Based on limited data, 1-chlorooctane is expected to readily biodegrade in water under aerobic conditions(SRC). In an aerobic aqueous screening test, 1-chlorooctane, incubated with a sludge inoculum, reached 74-81% of the theoretical BOD in 4 weeks(5).ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1-chlorooctane, which has a measured vapor pressure of 0.95 mm Hg at 25 °C(2), will exist solely as a vapor in the ambient atmosphere. Vapor-phase 1-chlorooctane 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 about 2 days(3,SRC). |
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