Registration Dossier
Registration Dossier
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EC number: 202-044-8 | CAS number: 91-15-6
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes with OH-radicals.
Key value for chemical safety assessment
- Half-life in air:
- 349 d
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 phthalonitrile (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.
Assessment
Based on a measured overall rate constant for the photogegradation with OH-radicals, phthalonitrile will be photodegraded within 349 days (Atkinson 1987). For the calculation of half-life a 24 hour day as well as a sensitizer concentration of 500000 molecules/cm³ were assumed. This result is supported by a model calculation (SRC AOPWIN v1.92, BASF SE, 2021), which estimated the half-life of the substance to be 356 days (half-life calculated for the following conditions: sensitizer for indirect photolysis: OH; 0.5 E06 OH/cm³, 24h day).
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