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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 308-783-3 | CAS number: 98510-75-9
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
72 h ErC50 = 14.7 mg a.i./L (95% c.l. 12.4 - 17.5 mg a.i./L)
72 h ErC10 = 4.42 mg a.i./L (95% c.l.3.70 - 5.18 mg a.i./L)
72 h NOEC = 1.3 mg a.i./L
(OECD TG 201; Desmodesmus subspicatus; static, natural river water containing 2.91 mg/L TOC (2.84 mg/L DOC); RL1; GLP)
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 14.7 mg/L
- EC10 or NOEC for freshwater algae:
- 4.42 mg/L
Additional information
In a 72 hour toxicity study according to OECD Guideline 201 (2011), the cultures of Desmodesmus subspicatus CHODAT SAG 86.81 were exposed to Undecylenamidopropyl Betaine at nominal concentrations of 0 (control), 3.05, 6.10, 12.2, 24.4, 48.8 mg a.i./L in natural river water, corresponding to geom. mean measured concentrations of 0 (control), 1.3, 4.58, 10.0, 22.9, 47.3 mg a.i./L under static conditions.
All test concentrations and the control were analytically verified by LC-MS/MS analysis at the start of the exposure (0 hours), 24, 48 hours and the end of the exposure (72 hours).
Microscopic evaluation of the cells at start and the end of the incubation period revealed no morphological abnormalities.
The test item solutions were visually clear throughout the exposure phase of 72 hours. Concentration related, slight foaming was observed during the whole exposure phase.
The measured concentrations of the test item at the start of the exposure were in the range of 104 to 107% of the nominal values. At the end of the exposure, the measured concentrations of the test item were in the range of 17 to 90% of the nominal values. Therefore, all calculation results are based on the geometric mean measured concentrations.
The NOEC, EC10 and EC50 of Undecylenamidopropyl Betaine based on growth rate were 1.3 mg a.i./L, 4.42 mg a.i./L (95% c.l.3.70 - 5.18 mg a.i./L) and 14.7 mg a.i./L (95% c.l. 12.4 - 17.5 mg a.i./L), respectively.
The NOEC, EC10 and EC50 of Undecylenamidopropyl Betaine based on yield were 1.3 mg a.i./L, 2.85 mg a.i./L (95% c.l.2.09 - 3.57 mg a.i./L) and 4.85 mg a.i./L (95% c.l.4.35 - 5.47 mg a.i./L), respectively.
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.
