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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 306-004-1 | CAS number: 95465-89-7
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Data on the kinetic rate constant for the reaction of members of the category with OH radicals were not available for any of the streams within this category. However, as the category consists of mainly C4 hydrocarbons, data were read-across from hydrocarbon C4 substances. Atkinson (1985) is a review article, with no data reported on the test methods or conditions of the original data source. Never-the-less, the data are taken from a published, peer-reviewed journal article and are considered to be suitable for this endpoint. The measured results provide a rate constant of the reaction of OH radicals with three read-across hydrocarbon C4 substances (106-98 -9: 3.14 E-11 cm3/mol/s, 115-11-7: 5.14 E-11 cm3/mol/s, 106-97-8: 2.53 E-12 cm3/mol/s). The results indicate that the category would have an atmospheric half-life of approximately 0.5 days (106-98-9), 7.5 hours (115-11-7) and 6.3 days (106-97-8) and therefore would not be persistent in the atmospheric compartment.
The kinetic rate constant for the reaction of members of the category with OH radicals is therefore considered to be 3.14E-11 to 2.53E-12 cm3/mol/s, indicating that the atmospheric half-life would be in the range 7.5 hours to 6.3 days.
The mean of the atmospheric half-life values for the category is 2.4 days and this has been used to complete the 'key value for chemical safety assessment'.
Key value for chemical safety assessment
- Half-life in air:
- 2.4 d
Additional information
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.
