Registration Dossier
Registration Dossier
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EC number: 201-185-2 | CAS number: 79-20-9
Phototransformation in air
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:
- 50.4 d
- Degradation rate constant with OH radicals:
- 0.318 cm³ molecule-1 s-1
Additional information
Direct photolysis of methyl acetate in the atmosphere is not to be expected. However, in the atmosphere gaseous methyl acetate reacts with hydroxyl radicals which have been formed photochemically. On the basis of an atmospheric concentration of the OH-radicals amounting to 5.105 OH/cm3 and the rate constant (kdegair) of 0.3182.10-12 cm3.molecule-1.s-1, a half-life of 50.4 days is calculated for the photochemical degradation in the atmosphere. (EU-RAR)
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