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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 200-838-9 | CAS number: 75-09-2
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The lowest threshold level (comparable to an 8-d NOEC/EC3) was 550 mg/l in the cyanobacterium (blue-green alga) Microcystis aeruginosa . Other studies who far higher effect concentration. therefore the lowest was used in a weight of evidence way.
Key value for chemical safety assessment
- EC10 or NOEC for freshwater algae:
- 550 mg/L
Additional information
Three studies are reported for algae. They are under discussion of being used for the assessment, either because of short duration (Hutchinson et al., 1978), the use of a non standard endpoint (toxicity threshold, Bringmann and Kühn, 1978) or because of lack of information (Bayard et al., 1985), and all were based on nominal concentrations. Although some of the studies used closed vessels, there was a significant headspace which would allow loss by volatility. However, the toxicity threshold values reported for Microcystis aeruginosa and Scenedesmus quadricauda are approximately equivalent to NOEC/EC3 values and are sufficient to indicate that algae are probably less sensitive to dichloromethane than fish or invertebrates. The study with Microcystis aeruginosa has the lowest effect concentration and will be used in the 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.
