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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes.                                                                         

Key value for chemical safety assessment

Additional information

Based on a 24 -h day and an OH-radical concentration of 0.5 E06 OH/cm³, a degradation rate constant of 10.96 E-12 cm³/(molecule*sec) was estimated by the AOPWIN v.1.92 (EPISUITE v4.11). The substance is estimated to be photodegraded by OH-radicals with a half-life of 35.128 h (BASF SE, 2015); the substance is within the applicability domain of the model.


Hence, the test substance is expected to be slowly degraded by photochemical processes after evaporation or exposure to air.




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 cyanoacetate (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.