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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 217-682-2 | CAS number: 1929-82-4
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
Photolysis only
Half-life = 226 hours
Hydrolysis and photolysis
Half-life = 99.1 hours
Key value for chemical safety assessment
- Half-life in water:
- 226 h
Additional information
The aqueous photolysis of the test material was investigated in a study conducted under GLP conditions and in accordance with the standardised EPA Guideline Subdivision N 161-2 (Photodegradation Studies in Water). The study was assigned a reliability score of 1 in line with the criteria of Klimisch et al. (1997).
A 368 hour photolysis study was conducted with 14C-test material at 25 °C in an aqueous solution buffered at pH 7 with tris(hydroxymethyl)aminomethane hydrochloride. Portions of the solution, prepared at a nominal test concentration of 2 µg/mL, were exposed to the output of a 6500 W xenon arc light. Quantification of 14C-activity was performed by liquid scintillation counting; separations of the exposed solutions were carried out by high performance liquid chromatography. One photolysis product was identified by gas chromatography/mass spectrometry.
The test material was subject to both hydrolysis and photolysis under the conditions of this study. The first-order rate constant and half-life for test material degradation calculated for the combined processes from the experimental data were 0.00699 hour^-1 and 99.1 hours, respectively; for sensitised samples (prepared in a similar fashion but amended to contain 1 % acetone by volume), corresponding values of 0.0102 hour^-1 and 67.9 hours were obtained. When the effect of hydrolysis was factored out, the rate constants and half-lives due to photolysis alone were found to be 0.00306 hour^-1 and 226 hours for the non-sensitised samples and 0.00687 hour^-1 and 101 hours for the sensitised system.
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.
