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Environmental fate & pathways

Phototransformation in air

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Description of key information

Atmospheric photooxidation half-lives of 0.24 days (hydroxyl radicals), 2 days (ozone), and 3.2 days (NO3 radicals) have been reported.

Key value for chemical safety assessment

Half-life in air:
0.24 d
Degradation rate constant with OH radicals:
500 000 cm³ molecule-1 s-1

Additional information

As most 1,3-butadiene released to the environment will distribute to the atmosphere, the dominant degradation process in this compartment will be photooxidation with reactive species that include hydroxyl radicals, ozone, and nitrate radicals (NO3). 1,3-Butadiene has been shown to react rapidly with with these species in the vapour phase. The reaction rates with ozone and NO3 are less rapid, and therefore less important than the reaction rate with hydroxyl radicals during daylight hours. However, at night, when the concentration of hydroxyl radicals falls to negligible levels, the degradation processes that involve ozone and NO3 will predominate. Overall, 1,3 -Butadiene is expected to be rapidly degraded in the atmosphere through photooxidative reaction mechanisms.