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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:
January 24th, 2023
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:
See the attached justification.
Qualifier:
according to guideline
Guideline:
other: ECHA Guidance on information requirements and chemical safety assessment - Chapter R.06: QSARs and grouping of chemicals
Principles of method if other than guideline:
See the justification for type of information.
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
Standard European settings
- Concentration of OH radicals: 0.5E+06 OH/cm3
- Timeframe: 24 hr/day
Temperature for which rate constant was calculated: 25°C
Computer programme: EPA EPIWIN (v4.11), AOPWIN module (v1.93)
DT50:
304.128 h
Test condition:
OH concentration: 0.5E+06 OH radicals/cm3; Timeframe: 24 h/day (EU std conditions)
Reaction with:
OH radicals
Rate constant:
0 cm³ molecule-1 d-1
Validity criteria fulfilled:
yes
Conclusions:
The stability of the test material in the atmosphere was calculated using the software AOPWIN.
It is predicted that the test material will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life of 304.1 hours, at European test conditions.
The overall degradation rate constant with OH radicals was estimated to be 0.84E-12 cm3/molecule-sec, equivalent to 7.29E-8 cm3/molecule-day.
Executive summary:

The stability of the test material in the atmosphere was calculated using the software AOPWIN.
It is predicted that the test material will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life of 304.1 hours, at European test conditions.
The overall degradation rate constant with OH radicals was estimated to be 0.84E-12 cm3/molecule-sec, equivalent to 7.29E-8 cm3/molecule-day.

Description of key information

Key value for chemical safety assessment

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

Additional information

The stability of the test material in the atmosphere was calculated using the software AOPWIN.
It is predicted that the test material will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life of 304.1 hours, at European test conditions.
The overall degradation rate constant with OH radicals was estimated to be 0.84E-12 cm3/molecule-sec, equivalent to 7.29E-8 cm3/molecule-day.