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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 rapidly degraded by photochemical processes.

Key value for chemical safety assessment

Additional information


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. Furthermore according to Article 25 of the same Regulation testing on vertebrate animals shall be undertaken only as a last resort. 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-Imidazolidone (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 is sufficiently covered and suitable for risk assessment. Therefore, further experimental studies on phototransformation in air are not provided.


An AOP v1.92 calculation is available for the estimation of the photodegradation in the atmosphere. For this calculation a 12-hour day as well as a sensitizer-concentration (OH-radicals) of 1500000 molecules/cm³ were assumed. The calculated rate constant of 8.0290E-12 cm³/molecule-sec results in a half-life in the atmosphere of approx. 16 hours (BASF, 2017). It is to be considered, that the test substance is a heterocyclic amine and thus the estimated values are highly uncertain.