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EC number: 200-835-2
CAS number: 75-05-8
Acetonitrile is expected to exist solely as a vapor in the ambient
atmosphere. Acetonitrile is degraded in the atmosphere by reaction with
photochemically-produced hydroxyl radicals; the half-life of this
reaction in air has been estimated to range from 20-620 days. An overall
half-life for acetonitrile in the troposphere of about 42 days has been
estimated considering both the OH radical and ozone reaction rate
constants (USEPA, 1987). However, based on average tropospheric
conditions reported by Klopffer (1988), this number would be about one
year (321 days) according to the 2000 EU Risk Assessment for
acetonitrile. Acetonitrile absorbs light only in the far UV regions, and
therefore is not expected to be susceptible to direct photolysis by
Hydrolysis is unimportant to the aquatic fate of acetonitrile.
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