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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to the air, the product will be rapidly degraded by photochemical processes. 

Key value for chemical safety assessment

Additional information

Based on the calculation according to AOPWIN v1.92, caffeine is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of about 19.8 hours taking into account a 24-h day and a mean OH radical concentration of 5.0E05 radicals per cm³.