Registration Dossier
Registration Dossier
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EC number: 203-678-8 | CAS number: 109-53-5
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
After evaporation or exposure to air, isobutyl vinyl ether will be rapidly degraded by photochemical processes. This fate path is of major importance as the substance will evaporate rapidly from the environmental compartments water and soil into the atmosphere.
Key value for chemical safety assessment
Additional information
QSAR-disclaimer
In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met.
According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided.
For the assessment of the substance (Q)SAR results were used for phototransformation in air. The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.
Therefore, further experimental studies on phototransformation in air are not provided.
Assessment
Based on an estimated OH radical rate constant of 48.3224E-12 cm³/molecule-sec, the half-life of the substance was calculated to be 7.968 h by using EPISuite v4.11, AOPWIN v1.92 (test conditions: sensitiser for indirect photolysis: OH; 0.5 E06 OH/cm³, 24-h d) (BASF SE, 2022). AOPWIN v1.92 lists an experimental value which indicates a longer half-life than the modelled result (degradation rate: 11E-12 cm³/molecule-sec; DT50 = 35 h). For reasons of comparability with other data, the modelled result will be used for the assessment.
The substance will be rapidly degraded by photochemical processes, after evaporation or exposure to air.
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