Acetyl Chloride

CAS RN: 75-36-5

Environmental Fate

TERRESTRIAL FATE: No reports are available on the fate of acetyl chloride in soil. In view of its violent decomposition in the presence of water(1) and high reactivity towards molecules with active hydrogen groups such as natural products containing amine, phenol, and alcohol functional groups that occur in soil(1), it is unlikely that acetyl chloride would persist for long in moist soils(SRC). The potential for volatilization of acetyl chloride from dry soil surfaces may exist(SRC) based upon a vapor pressure of 287 mm Hg(2).
AQUATIC FATE: Acetyl chloride violently decomposes in the presence of water(1) and therefore will not persist in the aquatic environment(SRC). Bioconcentration in aquatic species is not expected because of the very short lifetime of this compound in water(SRC).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), acetyl chloride, which has a vapor pressure of 287 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase acetyl chloride may be 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 years(SRC), calculated from its rate constant of 9.1X10-15 cu cm/molecule-sec at 25 deg C(3). However, acetyl chloride violently decomposes in the presence of water(4) and fumes in the presence of moist air(5).
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