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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes with OH-radicals.

Key value for chemical safety assessment

Half-life in air:
8 d

Additional information

Atkinson et al. performed a test on photodegradation of 3 -pentanone using a all-Teflon chamber and OH radicals as sensitizer.. 
A rate constant of 2.05E-12 cm³/molecule*sec at 23 +/- 2 °C was measured. Calculated for a 24 
h day an a assumed OH radical concentration of 500000 molecules/cm³ a half-life in the atmosphere of 
7.82 days was calculated.