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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in air

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Administrative data

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.