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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 941-570-9 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
An algae test with Reaction mass of 2-butylheptanoic acid and 2-ethylnonanoic acid and 2-methyldecanoic acid and 2-propyloctanoic acid is not available. The toxicity of Reaction mass of the similar substance n-undecanoic-acid and 2-methyl-decanoic-acid and 2-ethyl-nonanoic-acid and 2-propyl-octanoic-acid and 2-butyl-heptanoic-acid was assessed in a fresh water algal groth inhibition test with Pseudokirchnerella subcapitata according to OECD guideline 201. The ErC10 of 2.7 mg/L (95% CL 2.0 – 3.5 mg/L), NOErC of 1.3 mg/L and the ErC50 of 13 mg/L (95% CL 11 – 15 mg/L) after 72 hours of exposure can be considered reliable without restrictions.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 13 mg/L
- EC10 or NOEC for freshwater algae:
- 1.3 mg/L
Additional information
An algae test with Reaction mass of 2-butylheptanoic acid and 2-ethylnonanoic acid and 2-methyldecanoic acid and 2-propyloctanoic acid is not available. Toxicity in freshwater algae Pseudokirchneriella subcapitata with the similar substance Reaction mass of n-undecanoic-acid and 2-methyl-decanoic-acid and 2-ethyl-nonanoic-acid and 2-propyl-octanoic-acid and 2-butyl-heptanoic-acid was tested according to OECD guideline No. 201. The study met the acceptability criteria and was conducted GLP compliant, therefore considered reliable without restrictions. Under the conditions of the study, Reaction mass of n-undecanoic-acid and 2-methyl-decanoic-acid and 2-ethyl-nonanoic-acid and 2-propyl-octanoic-acid and 2-butyl-heptanoic-acid inhibited growth rate and yield of this fresh water algae species significantly at a time weighted average concentration of 4.2 mg/L.
The EC50 for growth rate inhibition (72h-ErC50) was 13 mg/L (95% confidence interval ranging from 11 to 15 mg/l).
The EC50 for yield inhibition (72h-EyC50) was 3.1 mg/L (95% confidence interval ranging from 2.0 to 3.3 mg/L).
The 72h-NOEC for growth rate inhibition was 1.3 mg/L. The 72h-EC10 for yield inhibiton was 1.2 mg/L.
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.
