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Environmental fate & pathways

Phototransformation in air

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Description of key information

The overall atmospheric half-life for the DVB-HP, -63, and -55 substances is estimated to be 6.3 hours.  

Key value for chemical safety assessment

Half-life in air:
6.3 h

Additional information

The second-order rate constants for reactions of divinylbenzene and ethylvinylbenzene isomers with photochemically-generated hydroxyl radical and ozone were estimated using the U.S. EPA AOPWIN v1.92a software. The model indicated no difference in reactivity among the o-, m-, and p-isomers of the DVB and EVB components, and that reactions with EVB had the longest predicted half-lives among the DVB and EVB substances. The QSAR model was shown to give estimted reaction rate constants which were within a factor of approximately 2 of measured rate constants for structural analogs, styrene and ethylbenzene. The overall atmospheric half-life for the DVB-HP, -63, and -55 substances is estimated to be 6.3 hours. Although the components of the substance can be expected to absorb sunlight at wavelengths > 290 nm, there is no evidence to suggest that direct photolysis would be a more important or more rapid process, than estimated for these indirect photolytic reactions.

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