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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air T1/2 = 5.2 hours or 0.44 days (12 hrs daylight) for DIPE and T1/2=1.5 hours or 0.12 days (12 hrs daylight) for 2-methylpent-2-ene at 298K (sensitizer: OH radical) (AOP win v1.92).

Key value for chemical safety assessment

Additional information

A degradation rate constant with OH radicals of 24.3371 E-12 cm3 molecule-1 sec-1 at 25 deg C and 1.5E6 OH/cm3 for DIPE and of 88.2733 E-12 cm3/molecule-sec for 2 -methylpent-2 -ene at 25°C and 1.5E6 OH/cm3

for 2 -methylpent-2 -ene was estimated using AOP win v1.92, based on SAR developed by Atkinson. Both DIPE and 2 -methylpent-2 -ene are expected to rapidly degrade in the atmosphere by hydroxyl radical attack.