Registration Dossier
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EC number: 246-278-9 | CAS number: 24468-13-1
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
After evaporation or exposure to air, the substance and its hydrolysis product 2-ethylhexanol will be slowly degraded by photochemical processes.
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 2-ethylhexyl chloroformate and the hydrolysis product 2-ethylhaxanol (CAS 104-76-7) (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:
Parent compound 2-ethylhexyl chloroformate
Based on an estimated OH radical rate constant of 10.9065E-12 cm³/(molecule*sec), the half-life of 2-ethylhexyl chloroformate was calculated to be 1.47 d (sensitiser for indirect photolysis: OH; 0.5 E06 OH/cm³, 24-h d; EPISuite, AOPWIN v1.92, BASF, 2021). The substance is within the applicability domain of the model.
Hydrolysis product 2-ethylhexanol
Based on an estimated OH-radical rate constant of 13.23E-12 cm³/(molecule*sec), a half-life of 1.21d was calculated for the photochemical degradation by OH-radicals (EPISuite, AOPWIN v1.92, BASF, 2021). The substance is within the applicability domain of the model.
After evaporation or exposure to air, the substance and its hydrolysis product 2-ethylhexanol will be slowly degraded by photochemical processes. This estimation refers to dry air. In mist, rain, droplets and aerosols hydrolysis will be the major fate process in air due to the short half-life in aqueous solutions.
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