Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 272-338-9 | CAS number: 68814-67-5 A complex combination obtained from various petroleum refining operations. It consists of hydrogen and hydrocarbons having carbon numbers predominantly in the range of C1 through C3.
Phototransformation in air
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: Data calculated from several sources, limitations in reporting but considered reliable with restriction
Data source
Reference
- Reference Type:
- review article or handbook
- Title:
- Kinetics and mechanisms of gas-phase reactions with the hydroxyl radical with organic compounds under atmospheric conditions.
- Author:
- Atkinson, R.
- Year:
- 1 985
- Bibliographic source:
- Chem. Rev. 85, 61-201.
Materials and methods
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants to calculate a preferred value.
Test material
- Reference substance name:
- Methane
- EC Number:
- 200-812-7
- EC Name:
- Methane
- Cas Number:
- 74-82-8
- IUPAC Name:
- methane
Constituent 1
Study design
- Estimation method (if used):
- Calculated half life based on a rate constant of 8.41E-15 cm3 / molecule / sec, OH-radical concentration 5.105 molecules.cm-3, as specified in the TGD
- Details on test conditions:
- at 298K
Results and discussion
Dissipation half-life of parent compound
- DT50:
- 1 906 d
Applicant's summary and conclusion
- Conclusions:
- The half life of methane has been estimated to be 1908 days 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 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 methane based on all valid studies at the time of publication.
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