Registration Dossier
Registration Dossier
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EC number: 203-561-1 | CAS number: 108-21-4
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The atmospheric half-life of isopropyl acetate has been estimated to be in the range of 3 to 5 days, based on reaction rates with hydroxyl radicals.
Key value for chemical safety assessment
Additional information
Atkinson (1989) reported a rate constant for the vapor phase reaction of isopropyl acetate with photochemically-produced hydroxyl radicals of 3.4 x 10E-12 cm3/(molecule*sec) at 25 deg C. This corresponds to an atmospheric half-life of about 4.7 hours at an atmospheric concentration of 5 x 5E5 hydroxyl radicals per cubic meter.
Meylan (1993) estimated the half-life for this reaction in air to be about 4.6 days.
The atmospheric photo-oxidation potential of isopropyl acetate determined in smog chamber studies was assigned as Class II (low reactivity), based on a 5 tiered rating system (Farley, 1977).
Using a global average tropospheric hydroxyl radical concentration of 1.5 x 106molecules/cm3, a calculated second order photo-oxidation rate constant of 3.4807 x 10-12cm3/molecule-sec, and an assumed 12-h daylight photoperiod, the total tropospheric lifetime of isopropyl acetate is expected to be about 3.073 days (AOPWIN v.1.90, EPISUITE v. 3.11).
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