Registration Dossier
Registration Dossier
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EC number: 204-062-1 | CAS number: 115-07-1
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Atkinson (1985) recommended a rate constant of 2.63E-11 cm3/mol/sec for the reaction rate with hydroxyl radicals and Atkinson and Carter (1984) recommended a rate constant of 1.13E-17 cm3/mol/sec for the reaction rate with ozone. These rate constants equate to half lives of 14.6 and 23.7 hours respectively. These data indicate that indirect photolysis is expected to contribute significantly to degradation of propene in the environment.
Key value for chemical safety assessment
- Half-life in air:
- 14.6 h
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
Atkinson (1989) and Atkinson and Carter (1984) are review articles, 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 authors and other investigators were quality assessed and then used to develop rate constants for different chemicals. The data from Atkinson (1989) 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 propene will distribute to the atmosphere, it is important to consider the potential for photo-oxidation of propene. Propene has been shown to react rapidly with hydroxyl radicals and ozone 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, these removal mechanisms will become more important. Propene is expected to be rapidly removed from the atmosphere by photo-oxidation.
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