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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

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

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 diethylamine (CAS 109 -89 -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 is sufficiently covered and suitable for risk assessment.

Therefore, further experimental studies on phototransformation in air are not provided.

 

Assessment:

The photodegradation was calculated for diethylamine (CAS 109 -89 -7) with AOPWIN v1.92, implemented in EPISuite v4.11.

Based on an estimated OH radical rate constant of 8.1E-11 cm³/molecule-sec, the half-life was calculated to be 4.77 hours; for this calculation a 24 -hour day as well as a sensitizer concentration (OH radicals) of 0.5E+06 molecules/cm³ were assumed (BASF SE, 2020). The substance is presumably within the applicability domain of the model, but as it is a secondary amine, the estimated values are highly uncertain.

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