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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, tert-butyl methacrylate will be rapidly degraded by photochemical processes.
Calculated half-life for a 24-hr day and 0.5E+06 OH/cm3: 20.67 hr

Key value for chemical safety assessment

Additional information

There are no experimental data on photodegradation of tert-butyl methacrylate. According to Q(SAR) data using SRC AOP v1.92, tert-butyl methacrylate will be rapidly degraded by photochemical processes after exposure to the air reacting with the photochemically produced hydroxyl radicals and with ozone (calculated half-life for a 24-hour day and 0.5E06 OH/cm3: 20.67 hours; for a 24-hour day and 7E11 O3/cm3: 1 day) (BASF SE, 2009). Since tert-butyl methacrylate shows a Henry's Law constant of 281 Pa*m3/mol at 25 °C, rapid evaporation from the water surface can be expected.

 

Therefore, photodegradation may play a considerable role under environmental conditions.