Registration Dossier
Registration Dossier
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EC number: 921-577-3 | CAS number: 1174918-60-5
Phototransformation in air
Administrative data
- Endpoint:
- phototransformation in air
- Type of information:
- migrated information: read-across based on grouping of substances (category approach)
- 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:
- 1 985
- 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 substance name:
- 2-methylbutane
- EC Number:
- 201-142-8
- EC Name:
- 2-methylbutane
- Cas Number:
- 78-78-4
- Molecular formula:
- C5H12
- IUPAC Name:
- isopentane
- Details on test material:
- No data reported
Constituent 1
- 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.
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