Carbon Disulfide

CAS RN:75-15-0

Environmental Fate

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 270(SRC), determined from a log Kow of 1.94(2) and a regression-derived equation(3), indicates that carbon disulfide is expected to have moderate mobility in soil(SRC). Volatilization of carbon disulfide from moist soil surfaces is expected to occur(SRC) given a Henry's Law constant of 1.44X10-2 atm-cu m/mole at 24 deg C(4). The potential for volatilization of carbon disulfide from dry soil surfaces may exist(SRC) based upon a vapor pressure of 359 mm Hg(5). Biodegradation data are insufficient to predict the importance of biodegradation in the environment(SRC).

AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 270(SRC), determined from a log Kow of 1.94(2) and a regression-derived equation(3), indicates that carbon disulfide is not expected to adsorb to suspended solids and sediment in the water column(SRC). Carbon disulfide is expected to volatilize rapidly from water surfaces(3) based on a Henry's Law constant of 1.44X10-2 atm-cu m/mole at 24 deg C(4). Estimated volatilization half-lives for a model river and model lake are 2.6 hours and 3.5 days, respectively(SRC). According to a classification scheme(5), BCFs of <6.1 and <60 in carp at 50 and 5 ug/L, respectively(6) suggest bioconcentration in aquatic organisms is low to moderate(SRC). Biodegradation data are insufficient to predict the importance of biodegradation in the environment(SRC). Hydrolysis is not expected to be an important environmental fate process based on a half-life of over 1 year under alkaline conditions(7).

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), carbon disulfide, which has a vapor pressure of 359 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase carbon disulfide 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 5.5 days(SRC), calculated from its rate constant of 2.9X10-12 cu cm/molecule-sec(3).

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