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Environmental fate & pathways

Phototransformation in air

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Description of key information

The calculated degradation rate of the test substance with hydroxyl radicals (OH) is 186.013 x 10E-12 cm3/molecule/sec. The atmospheric degradation half-life of the test substance due to reactions with ozone is 0.058 days. 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:
0.058 d
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

Degradation rates for gas-phase reactions of the test substance with hydroxyl radicals and ozone in the atmosphere were calculated using the AOPWIN program, v1.92, which is based on the Atkinson structure-activity relationship method. The calculated degradation rate of the test substance with hydroxyl radicals (OH) is 186.013 x10E-12 cm3/molecule/sec. With the assumption of 1.5 x 1000 000 OH molecules/cm3 present during a 12 hour sunlight day, the atmospheric degradation half-life of the test substance due to reactions with hydroxyl radicals is 0.058 days.

 

The no calculated degradation rate of the test substance with ozone (O3) was estimated.

 

 

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. 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 the test substance (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 Photodegradation in air are not provided.