Cyanogen

CAS RN:460-19-5

Environmental Fate

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 8.3(SRC), determined from a log Kow of 0.07(2) and a regression-derived equation(3), indicates that cyanogen is expected to have very high mobility in soil(SRC). Volatilization of cyanogen from moist soil surfaces may be an important fate process(SRC) given an estimated Henry's Law constant of 3.45X10-4 atm-cu m/mole(SRC), based upon its vapor pressure, 4,300 mm Hg(4), and water solubility, 1.51X10+5 mg/L(5). Cyanogen will volatilize from dry soil surfaces(SRC) based upon its vapor pressure(4). Hydrolysis may occur in moist soils based on the hydrolysis of cyanogen in aqueous solutions(6). Biodegradation data were not available(SRC, 2008).
AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 8.3(SRC), determined from a log Kow of 0.07(2) and a regression-derived equation(3), indicates that cyanogen 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 3.45X10-4 atm-cu m/mole(SRC), derived from its vapor pressure, 4,300 mm Hg(4), and water solubility, 1.51X10+5 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 approximately 2 hours and 3 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 3.2(SRC), from a log Kow of 0.07(2) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low. Cyanogen slowly hydrolyzes in aqueous solution(8). Biodegradation data were not available(SRC, 2008).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), cyanogen, which has a vapor pressure of 4,300 mm Hg at 25 deg C(2) is expected to exist solely as a gas in the ambient atmosphere. Gas-phase cyanogen will be slowly degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is > 530 days, calculated from its rate constant of <0.03X10-12 cu cm/molecule-sec at 25 deg C(3). Cyanogen 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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