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Environmental fate & pathways

Phototransformation in air

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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Non-GLP, non guideline study. Calculated data, published in peer review literature. Calculated in accordance with the TGD
Justification for data waiving:
other:

Data source

Reference
Reference Type:
publication
Title:
Hydrogen-atom abstraction from alkanes by OH. 6. Cylcopentane and Cylcohexane
Author:
Droege A.T and Tully F.P
Year:
1987
Bibliographic source:
Journal of Physical Chemistry, 91, 1222-1225

Materials and methods

Principles of method if other than guideline:
Method: other. Absolute rate coefficients for the reaction of the hydroxyl radical with cyclopentane was determined by laser photolysis/laser induced fluorescence technique. The half life was calculated using the rate coefficients and the -OH radical concentration of 5E5 stipulated in the TGD
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Cyclopentane
EC Number:
206-016-6
EC Name:
Cyclopentane
Cas Number:
287-92-3
Molecular formula:
C5H10
IUPAC Name:
cyclopentane
Details on test material:
Purity: 98.4 % (measured by GC-FID), impurities n-pentane,
2,2-dimethylpentane, methylcyclopentane
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):
Calculated using a rate constant of 5.02 E-12 and the -OH radical concentration of 5 E5 molecules/cm3 as specified in the TGD.
Light source:
other: other
Details on test conditions:
Sensitiser (for indirect photolysis): OH
Sensitiser concentration: 75000000000 molecule/cm³
Duration of test at given test condition
Temp.:
295 K
Reference substance:
not specified
Remarks:
Not reported

Results and discussion

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

Any other information on results incl. tables

No data reported

Applicant's summary and conclusion

Conclusions:
The half life of cyclopentane is 3.2 days
Executive summary:

The test procedure did not follow standard procedure but was described in sufficient detail and calculated in accordance with the TGD. The study can therefore be considered suitable as a key study for this endpoint. The half life of cyclopentane is 3.2 days.

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