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EC number: 200-816-9
CAS number: 74-86-2
A photooxidation half-life of 13.124 days (hydroxyl radicals) has been reported using a recommended rate constant of 0.8150 E-12 cm3/molecule/sec. In addition a half-life of 382 days for ozone radicals has been reported.
(1989) is a review article, with no data reported on the test methods or
conditions of the original data source. Nevertheless, 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. The data have been used within the
AOP (Atmospheric Oxidation Program (AoPWin) V.1.92 within EPISuite 4.0
2008) to calculate a rate constant for atmospheric gas phase reaction
between photochemically produced hydroxyl radicals and organic chemicals.
As most acetylene will distribute to the
atmosphere, the most dominant environmental fate process will be
photooxidation. Acetylene has been shown to react rapidly with hydroxyl
radicals, ozone and NO3 in the vapour phase. The reaction with ozone is
less rapid, and therefore less important than the reaction with hydroxyl
radicals. However, at night, when the concentration of hydroxyl radicals
falls to negligible levels, this removal mechanism will become more
important. acetylene is expected to be rapidly removed from the
atmosphere by photooxidation.
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