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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.

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 morpholine (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.



The phototransformation in air was calculated for morpholine with AOPWIN v1.92, implemented in EPISuite v4.11. Morpholine is predicted to be indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of 2.8 hours taking into account a 24 -h day in combination with a mean OH radical concentration of 0.5E+06 radicals/cm3; presuming a 12 -h day in combination with a mean OH radical concentration of 1.5E6 radicals/cm3,the half-life of morpholine was predicted to be 0.9 hours, respectively (BASF SE, 2016).

As morpholine does not absorb light in the UV spectrum (lambda > 260 nm), a direct photochemical degradation is not to be expected in the hydrosphere.