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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 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)