Dipropylamine

CAS RN:142-84-7

Environmental Fate

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 190(SRC), determined from a log Kow of 1.67(2) and a regression-derived equation(3), indicates that dipropylamine is expected to have moderate mobility in soil(SRC). The pKa of dipropylamine is 11(4) indicating that this compound will exist almost entirely in the cation form in the environment and cations generally adsorb more strongly to soils containing organic carbon and clay than their neutral counterparts(5). Volatilization of dipropylamine from moist soil surfaces is not expected to be an important fate process given its cationic state(SRC). Dipropylamine is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 20.1 mm Hg(6). Dipropylamine was determined to be biodegradable using the Japanese MITI test protocol(7), suggesting biodegradation may be an important fate process in soil(SRC).
AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 190(SRC), determined from a log Kow of 1.67(2) and a regression-derived equation(3), indicates that dipropylamine is expected to adsorb to suspended solids and sediment(SRC). A pKa of 11(4) indicates dipropylamine will exist almost entirely in the cation form at pH values of 5 to 9 and therefore volatilization from water surfaces is not expected to be an important fate process(5). According to a classification scheme(6), an estimated BCF of 4(SRC), from its log Kow(2) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Dipropylamine was determined to be biodegradable using the Japanese MITI test protocol(8), suggesting biodegradation may be an important fate process in water(SRC).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), dipropylamine, which has a vapor pressure of 20.1 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase dipropylamine 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 4 hours(SRC), from its rate constant of 8.7X10-11 cu cm/molecule-sec at 25 deg C that was derived using a structure estimation method(3). Dipropylamine does not contain chromophores that absorb at wavelengths >290 nm(4) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC).
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