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Environmental fate & pathways

Phototransformation in air

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Link to relevant study record(s)

Reference
Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Accepted calculation method
Qualifier:
no guideline followed
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 500000 molecules/cm³
- Degradation rate constant: 8.1796 E-12 cm3/molecule-sec
- Computer programme: SRC AOP v1.92
DT50:
47.1 h

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:
2 d

Additional information

Based on the calculation according to SRC AOP v1.92, 2-ethylhexanoic acid is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of about 47.1 hours taking into account a 24-h day and a mean OH radical concentration of 5.0E+05 molecules per cm³ (BASF 2008).

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