Registration Dossier

Administrative data

Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Study period:
Up to 1985
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Non-GLP, non guideline study. Calculated data, published in peer review paper and was calculated in accordance with the TGD.

Data source

Reference
Reference Type:
publication
Title:
Kinetics and mechanisms of gas-phase reactions with the hydroxyl radical with organic compounds under atmospheric conditions
Author:
Atkinson, C
Year:
1985
Bibliographic source:
Chemistry Review. 85, 61-201.

Materials and methods

Principles of method if other than guideline:
The author used data from other investigators. This data was 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. This calculation was in accordance with the TGD
GLP compliance:
not specified
Remarks:
Not reported

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No data reported
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
No data reported

Study design

Estimation method (if used):
Endpoint was calculated based on a rate constant of 3.5 E -12 and-OH radical concentration of 5 E5 molecules/cm3
Details on light source:
No data reported
Details on test conditions:
No data reported

Results and discussion

Preliminary study:
No data reported
Test performance:
No data reported
Dissipation half-life of parent compound
DT50:
2.3 d
Results with reference substance:
No data reported

Any other information on results incl. tables

Based on a calculated rate constant of 7.38E-12 cm3 molecule-1sec-1, and a hydroxyl radical concentration of 5E5 molecule.cm-3

Applicant's summary and conclusion

Conclusions:
The dissipation half-life of 2-methylbutane was calculated as 2.3 days
Executive summary:

Measured data from 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 2 -methylbutane based on all valid studies at the time of publication. The half life of 2 -methylbutane is 2.3 days.