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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Validated QSAR model
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: 13.5390 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92
DT50:
28.44 h
Test condition:
calculation based on 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

Phototransformation in air is not relevant due to low vapour pressure (0.17 Pa at 20 °C)

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of isodecyl pivalate (CAS 60209-82-7) are available. Results obtained with AOPWIN v1.92 indicate that isodecyl pivalate is susceptible to undergo indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 28.44 h (24 h day; OH-concentration: 0.5E+06 OH/cm³). However, this is not expected to be a relevant environmental fate process, since isodecyl pivalate is not expected to be present in the atmosphere based on the low estimated vapour pressure under ambient conditions (0.17 Pa at 20 °C). As this study is not a standard information requirement in REACh and there is no indication from the Chemical Safety Assessment (CSA) on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary for isodecyl pivalate.