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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 619-290-0 | CAS number: 97780-06-8
Phototransformation in air
Administrative data
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
- Report date:
- 2009
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline draft (Photochemical Oxidative Degradation in the Atmosphere)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: U.S. EPA Determination of Rates of Reaction in the GAS Phase in the Troposphere §796.3900 (1992)
- Deviations:
- no
- GLP compliance:
- no
Test material
- Reference substance name:
- Reference substance 002
- Cas Number:
- 97780-06-8
- Test material form:
- solid
- Details on test material:
- Purity: Not reported
Constituent 1
Study design
- Light source:
- sunlight
Results and discussion
Dissipation half-life of parent compound
- Key result
- DT50:
- 14.046 h
- Test condition:
- Half-life of test substance for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5E6 OH radicals per cm³)
Degradation rate constant
- Key result
- Reaction with:
- OH radicals
- Rate constant:
- 0 cm³ molecule-1 s-1
- Transformation products:
- no
Applicant's summary and conclusion
- Conclusions:
- Overall OH rate constant: 9.1380 x 10-12 cm3/molecule-sec
Half–life (for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5 x 106 OH radicals per cm3)): 14.046 hours - Executive summary:
An estimation of the photochemical degradation (indirect phototransformation) of the test substance was calculated in accordance the requirements of the European Union Commission 91/414/EEC Annex IIA, Point 2.10 as amended by Directive 94/37/EC, 22 July 1994 and OECD Test Guideline on Photochemical Oxidative Degradation in the Atmosphere.
The calculation of the second-order rate constant and associated half-life for the reaction of the test substance in the gas phase in the troposphere, using the method of Atkinson is provided. This calculation is an estimate of the photochemical oxidative degradation (indirect phototransformation) of the test substance. The overall OH rate constant is 9.1380 x 10-12 cm3/molecule-sec. The half–life of the test substance for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5 x 10E6 OH radicals per cm3) is 14.046 hours. Hydrogen abstraction, reaction with N, S and –OH and addition to aromatic rings are predicted to contribute to the rate of photochemical degradation.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
