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EC number: 204-066-3
CAS number: 115-11-7
The hydroxyl radical degradation half-life of butenes range from 7.5 to 12 hours. This range was derived from two members of the butenes category: but-1-ene (CAS 106-98-9) and 2-methylpropene (CAS 115-11-7).
Atkinson (1985) is a review article with no
data reported on the test methods or conditions of the original data
source. Never-the-less, the data are taken from a published,
peer-reviewed journal article and are considered to be suitable for this
endpoint. Measured data from author and other investigators were quality
assessed and then used to develop rate constants for different
chemicals. Therefore, this value represents a valid rate constant for
the substances based on all valid studies at the time of publication.
Atkinson (1985) recommended a rate constant
with hydroxyl radicals of 3.14 E-11 cm3/mol/sec for but-1-ene
and 5.14 E-11 cm3/mol/sec for 2-methylpropene. These rate
constants equate to half-lives of 12 and 7.5 hours respectively. These
data indicate that indirect photolysis is expected to contribute
significantly to degradation of butenes in the environment. The 'key
value for chemical safety assessment' has been completed using the most
conservative of the available data.
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