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Environmental fate & pathways

Phototransformation in air

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Reference
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Scientifically acceptable calculation
Principles of method if other than guideline:
SRC AOP v1.92
GLP compliance:
no
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 500000 molecule/cm³
- Degradation rate constant: 0.0000000000788 cm³/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Calculated t 1/2 is based on a 24 h day
DT50:
4.88 h

Description of key information

After evaporation or exposure to the air, triisobutyl phosphate will be rapidly degraded by photochemical processes.

Key value for chemical safety assessment

Additional information

Based on a calculation according to AOPWIN v1.92, triisobutyl phosphate is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of about 4.88 h taking into account a 24-h day and a mean OH radical concentration of 0.5E06 radicals per cm³ [BASF SE, 2011].