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EC number: 200-835-2
CAS number: 75-05-8
If released to air, acetonitrile is expected to exist solely as a vapor
in the ambient atmosphere based on a moderately high vapor pressure.
Vapor-phase acetonitrile will be degraded in the atmosphere by reaction
with photochemically-produced hydroxyl radicals. The half-life of this
reaction is estimated to be on the order of weeks to months. Wet
deposition may reduce atmospheric acetonitrile.
Acetonitrile is expected to persist for months in the troposphere.
Acetonitrile is not expected to to be susceptible to direct photolysis.
If released to soil, acetonitrile is expected to have high mobility.
Volatilization from moist and dry soil surfaces is expected.
Aerobic biodegradation is expected to be the major loss process in soil
and water.In the 2000 EU Risk
Assessment of acetonitrile, the Competent Authority concluded that
acetonitrile should be considered as ready biodegradable for local
scenarios if WWTP is available, while, due to the higher uncertainty and
the application of the Precautionary Principle, the rate constants
reported in the TGD for inherent biodegradable chemicals must be applied
for regional/continental scenarios and to derive the rate constant for
If released to water acetonitrile
is not expected to adsorb to suspended solids and sediment.
Volatilization from water surfaces is expected to be an important fate
process. The potential for acetonitrile to bioaccumulate in aquatic
organisms is low. Hydrolysis is not expected to be an important fate
Level III fugacity modeling of
acetonitrile distribution, using the US EPA EPIWIN softwarepredicted
the following percent distribution and half-lives for acetonitrile in
Air - 13%, 1544 hours
Water - 44.1%, 360 hours
Soil - 42.8%, 720 hours
Sediment - 0.0811%, 3240 hours
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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