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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 a calculation according to AOPWIN v1.92, HDDA is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of about 14 hours taking into account a 24-h day and a mean OH radical concentration of 0.5E06 radicals per cm³ [BASF SE 2008].
Using the same method, atmospheric half-life (t1/2) of HDDA is estimated to be 79 hours when O3 is acting as sensitiser (conc. 7E11 molecule/cm³) [BASF SE 2008].