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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

After evaporation or exposure to air, the substance will be slowly degraded by photochemical processes.

Key value for chemical safety assessment

Half-life in air:
19.079 d
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 the 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 phototransformation in air are not provided.

 

Assessment of atmospheric degradation

A rate constant of 2.803E-13 cm3/molecule-sec and a half-life of about 19.097 days were predicted for ethylene oxide in a calculation assuming OH radicals (500000 molecule/cm³) as sensitizer for indirect photolysis and a 24 h day (EPISuite v.4.11, AOP v1.92; BASF SE, 2022). The substance is within the applicability domain of the model.

After evaporation or exposure to air, the substance will be slowly degraded by photochemical processes.