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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:
2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline followed
Principles of method if other than guideline:
EPIWIN calculation SRC AOP v1.92
GLP compliance:
no
Details on test conditions:
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 500000 molecule/cm³
- Degradation rate constant: 0.0000000000880726 cm³/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Calculated t 1/2 is based on a 24 h day
Key result
DT50:
4.372 h
Key result
Reaction with:
OH radicals
Rate constant:
0 cm³ molecule-1 d-1
Validity criteria fulfilled:
yes
Conclusions:
Based on a calculation according to AOPWIN v1.92, 'α,α'-propylenedinitrilodi-o-cresol' will be indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with a half-life (t1/2) of about 4.37 hours taking into account a 24-h day and a mean OH radical concentration of 0.5E06 radicals per cm³ . Nevertheless, due to the low volatility of ´α,α'-propylenedinitrilodi-o-cresol´, distribution into the atmosphere would be negligible.

Description of key information

Based on a calculation according to AOPWIN v1.92, the substance will be indirectly photodegraded by reaction with hydoxyl radicals in the atmosphere with a half life (t 1/2) of about 4.37 hours taking into account a 24 hour day and

a mean OH radical concentration of 0.5E06 radicals per cm3. Nevertheless, due to the low volatility of the substance, distribution into the atmosphere would be negligible

Key value for chemical safety assessment

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

Additional information

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

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