Registration Dossier
Registration Dossier
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EC number: 441-420-8 | CAS number: 113889-23-9
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The photodegradation of Cyclobutanate was estimated by EPIWIN AOP version 4.10. The estimated rate constants (in cm3.molecule^-1.s^-1) are 68.5 * 10^-12(OH radicals) and 20.0 * 10^-17(O3). Combined with estimated ambient atmospheric concentrations of OH-radicals, an atmospheric half-lifetime of 1.9 hours is calculated based on a 12-hour daylight average atmospheric concentration of 1.5 * 10^6molecule cm^-3, assuming a daylight period of 12 h. For the CSA these values will not be used because the exposure model EUSES does not consider these values.
For reaction with O3, the atmospheric half -lifetime is 1.4 h with 7 * 10^11mol/cm3. These data indicate that the atmospheric lifetime of Cyclobutanate is sufficiently short that it will not undergo long-range transport to any significant extent.
Key value for chemical safety assessment
Additional information
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