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Environmental fate & pathways

Phototransformation in air

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phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP status not known, guideline not known, published in peer reviewed literature, acceptable with restrictions
Justification for type of information:
A discussion and report on the read across strategy is given as an attachment in Section 13.
Reason / purpose for cross-reference:
read-across: supporting information

Data source

Reference Type:
Kinetics and mechanisms of the gas phase reactions of the hydroxyl radical with organic compounds under atmospheric conditions
Atkinson, R.
Bibliographic source:
Chem. Rev. 85, (1985) 69 - 201

Materials and methods

Principles of method if other than guideline:
The author used data from other investigators. These data were generated using two methods: absolute and relative constant techniques. The author then applied a least squares analysis of degradation rate constants for organic chemicals by hydroxyl radicals developed by other investigators.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
EC Number:
EC Name:
Cas Number:
Molecular formula:
Details on test material:
data not reported
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
not applicable

Study design

Estimation method (if used):
The rate constants were taken from experiments using relative constant techniques
Details on light source:
data not reported
Details on test conditions:
data not reported

Results and discussion

Preliminary study:
data not reported
Test performance:
data not reported
Dissipation half-life of parent compound
10.2 h
Test condition:
Author reports a recommended rate constant of 3.75E-11 cm3 molecule-1sec-1. Half life is calculated based on this rate constant and a hydroxyl radical concentration of 5E5
Results with reference substance:
data not reported

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
The estimated half life of 1-hexene is 10.2 hours based on a recommended reaction rate with hydroxyl radicals and the concentration of hydroxyl radicals recommended in the Technical Guidance Document (2003).
Executive summary:

Measured data from the author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for 1 -hexene based on all valid studies at the time of publication.