Registration Dossier
Registration Dossier
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EC number: 289-339-5 | CAS number: 87741-01-3
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The phototransformation in air half-lives of the constituents in the category range from 0.24 to 59 days, with methane presenting a half-live of 1907 days, which is 2-3 orders of magnitude higher than the rest.
Key value for chemical safety assessment
- Half-life in air:
- 12.5 d
Additional information
Data from Atkinson (1985) were available for the substances methane, ethane, propane, 2 -methylpropane (isobutane), 2-methylpropene, butane, 1-butene and 1,3 -butadiene. 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. The phototransformation half-life of methane is 1907 days, ethane is 59 days, propane is 14 days, 2 -methylpropane (isobutane) is 6.8 days, 2 -methylpropene is 0.31 days, butane is 6.3 days, 1-butene is 0.5 days and 1,3 -butadiene is 0.24 days.
The data available for these substances can be read across to other members of the category. The mean of the atmospheric half-life values for the category is 12.5 days (excluding methane of the mean for having a value of orders of magnitude higher than the rest) and this has been used to complete the 'key value for chemical safety assessment'.
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