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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 Trimethylenediamine (CAS 109 -76 -2) will be rapidly degraded by photochemical processes.

Key value for chemical safety assessment

Half-life in air:
5.9 h
Degradation rate constant with OH radicals:
64.781 cm³ molecule-1 s-1

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 Trimethylenediamine (CAS 109 -76 -2) (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.


In the atmosphere Trimethylenediamine (CAS 109 -76 -2) is expected to be indirectly photodegraded with a half-life of 5.944 hours based on a 24 -h day and an OH radical concentration of 0.5E6 OH/cm³ (AOPWIN v1.92, EPI Suite v4.12). The OH rate constant was estimated to be 64.7811E-12 cm³/molecule*sec.