Registration Dossier
Registration Dossier
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EC number: 203-905-0 | CAS number: 111-76-2
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Photochemical degradation rates: (all 6x10-12 cm3/(molecule.s):
18.6 (measured, OH)
23.5 (calc, OH)
21 (calc, OH)
19.6 (calc, OH)
29.4 (calc, OH)
.003 (meas, NO3)
.000000011 (meas, O3)
Predicted half life: 3-32.8, 5.46, 10, 16hrs in the atmosphere.
Key value for chemical safety assessment
- Half-life in air:
- 6.5 h
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
If 2 -butoxyethanol is present in ambient air, it is expected to exist almost entirely in the vapour phase, based on the physicochemical properties cited in chapter 4. This substance is not expected to absorb UV light in the environmentally significant range of >290 nm and is not therefore expected to undergo direct photolysis on sunlit soil surfaces, in the atmosphere or in aquatic environments. However, modelling predicts that it is likely to undergo indirect photolysis through hydroxyl radical reaction at a reasonably fast rate, with an estimated half life of 3 to 33 hours (with most estimates at the lower end of this range) at an OH concentration of 1.5million OH/cm3 and a 12 hour day). A figure of 12 (0.5day) is used for the key parameter. Data also indicates that reaction with O3 and NO3 radicals is negligible.
Available data indicates that the most labile sites for degradation are the two methyl groups either side of the peroxy linkage. The main breakdown product is n-butyl formate (50 -60%) with also propionaldehyde and 2 -hydroxyethylformate being significant.
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