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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-668-3 | CAS number: 7681-52-9
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
One study on freshwater vascular plant, Myriophyllum spicatum, concludes to a NOEC on growth (4 days exposure) = 0.02mg TRC/l. 50% growth inhibition occurs in the 0.1 - 0.4 mgTRC/L range (along to endpoint)
Key value for chemical safety assessment
- EC50 for freshwater plants:
- 0.1 mg/L
- EC10 or NOEC for freshwater plants:
- 0.02 mg/L
Additional information
As no unicellular algae standard test can be carried out for technical reason, use can be made of vascular plants. A study has been published in 1984 (not evaluated in european RAR) that assesses effects of continuous exposure of Myriophyllum spicatum, an ubiquitous freshwater plant, to dissolved chlorine. Growth parameters were evaluated for a 4 days exposure (longer exposure were not possible due to growth of epiphyton on the plants). It is then possible to use the calculated NOECs and EC50s for hazard assessment.
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.
