| 환경 거동 | TERRESTRIAL FATE: Based on a classification scheme(1), estimated Koc values of 575(SRC), determined from a structure estimation method(2), and 370(SRC), determined from a log Kow of 2.08(3), indicate that 3,4-dinitrotoluene is expected to have moderate to low mobility in soil(SRC). Volatilization of 3,4-dinitrotoluene from moist soil surfaces is not expected to occur(SRC) given an estimated Henry's Law constant of 9.3X10-8 atm-cu m/mole(SRC), using a fragment constant estimation method(2). 3,4-Dinitrotoluene is not expected to volatilize from dry soil surfaces(SRC) based upon an extrapolated vapor pressure of 3.5X10-4 mm Hg(4). 3,4-Dinitrotoluene is susceptible to photolysis on surfaces exposed to sunlight(5). Limited biodegradation data specific to 3,4-dinitrotoluene suggest that it is not readily biodegradable according to the Japanese MITI test(6) but can be co-metabolized(7). Biodegradation may be an important fate process for 3,4-dinitrotoluene based on results of various screening tests for other dinitrotoluene isomers that demonstrated microbial degradation(8-11).AQUATIC FATE: Based on a classification scheme(1), estimated Koc values of 575(SRC), determined from a structure estimation method(2), and 370(SRC), determined from a log Kow of 2.08(3), indicate that 3,4-dinitrotoluene is expected to adsorb to suspended solids and sediment in water(SRC). Volatilization from water surfaces is not expected(4) based upon an estimated Henry's Law constant of 9.3X10-8 atm-cu m/mole(SRC), developed using a fragment constant estimation method(2). According to a classification scheme(5), measured BCF values of less than 2.7(6) suggests the potential for bioconcentration in aquatic organisms is low. 3,4-Dinitrotoluene is not expected to undergo hydrolysis in the environment due to the lack of hydrolyzable functional groups(4). In aqueous solution, 3,4-dinitrotoluene has a quantum yield of 0.00007 at 313 nm(7) indicating that it is susceptible to direct photolysis by sunlight(SRC)based on this quantum yield, the photolysis half-life in surface water under summer conditions is slightly over 32 hours(7). Limited biodegradation data specific to 3,4-dinitrotoluene suggest that it is not readily biodegradable according to the Japanese MITI test(6) but can be co-metabolized(8). Biodegradation may be an important fate process for 3,4-dinitrotoluene based on results of various screening tests for other dinitrotoluene isomers that demonstrated microbial degradation(9-12).ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 3,4-dinitrotoluene, which has an extrapolated vapor pressure of 3.5X10-04 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. At temperatures below 15 °C, the gas/particle partitioning model predicts that 3,4-dinitrotoluene will exist in both the vapor and particulate phases. Vapor-phase 3,4-dinitrotoluene 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 84 days(SRC), calculated from its rate constant of 1.92X10-13 cu cm/molecule-sec at 25 °C(SRC), determined using a structure estimation method(3). Particulate-phase 3,4-dinitrotoluene may be removed from the air by wet or dry deposition(SRC). 3,4-Dinitrotoluene is susceptible to direct photolysis in sunlight(4). |
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