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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 635-476-4 | CAS number: 88349-88-6
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
The UV/VIS spectral absorption of cloquintocet acid was determined. These data were used for calculation of the half lives of direct photochemical degradation under environmental conditions for the months March and June in Central Europe.
The absorption maxima was at 313.5 nm and decadic molar extinction coefficient was Ɛ = 3842 [l/mol/cm]at 321 nm for cloquintocet acid, respectively.
Assuming a quantum yield for the direct photolytic degradation of 1.0, half lives were calculated to be 2 minutes (March) and 1 minute (June) for cloquintocet acid. Applying a quantum yield of only 0.1, corresponding half lives for cloquintocet acid would be between 22 and 6 sunlight minutes which would mean a very rapid degradation by direct photolysis in all seasons. As a worst-case, the value of 22 minutes was chosen as the key value from the study.
Key value for chemical safety assessment
- Half-life in water:
- 22 min
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.
