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Environmental fate & pathways

Phototransformation in air

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Description of key information

The estimated half life of the xylene isomers is around 1 day based on a recommended reaction rate with hydroxyl radicals and the concentration of hydroxyl radicals recommended in the Technical Guidance Document (2003).

Key value for chemical safety assessment

Half-life in air:
1 d

Additional information

Xylene isomers are expected to degrade by indirect photolysis in air. The dominant process is by reaction with hydroxyl radicals. Using rate constants recommended by Atkinson (1985) for the reaction rate with hydroxyl radicals half lives of around 1 day are calculated for each of the xylene isomers. These data indicate that indirect photolysis is expected to be a significant route of xylene removal from the environment.