Alkenes, C20-24 .alpha.-

Phototransformation in air

Administrative data

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: GLP status not known, guideline not known, published in peer reviewed literature, acceptable with restrictions

Data source

Reference

Reference Type:

publication

Title:

Kinetics and mechanisms of the gas phase reactions of the hydroxyl radical with organic compounds under atmospheric conditions

Author:

Atkinson, R.

Year:

1985

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

Test material information

Constituent 1

Reference substance name:

Hex-1-ene

EC Number:

209-753-1

EC Name:

Hex-1-ene

Cas Number:

592-41-6

IUPAC Name:

hex-1-ene

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

DT50:

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 molecule.cm-3

Results with reference substance:

data not reported

Applicant's summary and conclusion

Validity criteria fulfilled:

not applicable

Conclusions:

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.