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Environmental fate & pathways

Phototransformation in air

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Reference
Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
key study
Study period:
20 Feb 2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction: migrated from IUCLID 5.6
Principles of method if other than guideline:
Calculation based on AOPWIN v1.92, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
GLP compliance:
no
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 0.5E+06 radicals/cm3
- Degradation rate constant: 30.6378 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92
DT50:
12.568 h
Test condition:
calculation based on a 24 h day

For detailed describtion on the model and its applicability, see "Any other information on materials and methods incl. tables". The estimation is based on a 24 hour day.

Description of key information

T1/2 = 12.6 h (sensitizer: OH radical) (AOP Win v1.86)

Key value for chemical safety assessment

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

Additional information

No studies investigating the indirect photolysis of AEPD are available. Using AOP Program (v1.92), a half-life of 12.6 hours was calculated, indicating rapid degradation by indirect photolysis.

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