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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 251-649-3 | CAS number: 33704-61-9
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The acute toxicity towards Desmodesmus subspicatus was investigated according to OECD TG 201 under GLP. Algae were exposed to nominal concentrations of 0.43, 1.4, 4.3, 14 and 43 mg/l and observed for 72 hours. Because test concentrations decreased during the test to 10 to 24% of the nominal concentrations, the 72h-EC10 and 72h-ErC50 were based on the geometric mean concentrations and were 6 and 10 mg/l respectively. This is a worst case estimate because at these lower concentrations the substance was stable when stored under light and dark conditions or when using open vessels. The decreases in concentrations are likely to occur via adsorption to algae.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 10 mg/L
- EC10 or NOEC for freshwater algae:
- 6 mg/L
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.
