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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 271-807-5 | CAS number: 68608-88-8 This substance is identified by SDA Substance Name: C11-C13 branched alkyl benzene sulfonic acid and SDA Reporting Number: 25-096-00.
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
The 21 day NOEC of C11.8 LAS to Daphnia magna was 1.18 mg/L, based on survival and reproduction. The 21 day LC50 was 1.67 mg/L. Results are based on the mean measured concentration of the active ingredient. The data here are for a C11.8 LAS and when normalized to a C11.6 LAS, the value is 1.41 mg/L (method: van de Plassche et al., 1999).
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 1.41 mg/L
Marine water invertebrates
Marine water invertebrates
- Effect concentration:
- 1.41 mg/L
Additional information
The long-term toxicity of 11.8 LAS was evaluated in a 21 day survival and reproduction test with Daphnia magna, following the OECD 211 guideline. Four replicates per concentration, 5 organisms per replicate, were tested in a flow-through system (a modified Mount and Brungs proportional diluter). Mean measured concentrations were: Control, 0.32, 0.59, 1.18, 2.52, and 4.85 mg/L C11.8LAS (active ingredient).
Survival was monitored at 24 hr, 96 hr, 7 days and daily thereafter. Reproduction was monitored beginning with the production of the first brood on day 7 or 8, and daily thereafter. LC50s and EC50s were calculated by probit analysis. Results are based on the mean measured concentration of the active ingredient.
The 21-day NOEC was 1.18 mg/L, based on both survival and reproduction. The 21-day LC50 was 1.67 mg/L (95% CL 1.28 -2.18 mg/L). The 21 -day EC50s, based on total young production, average brood size, and % days reproduction occurred, were 1.50, 2.30, and 2.31 mg/L, respectively. The data here are for a C11.8 LAS and when normalized to a C11.6 LAS, the value is 1.41 mg/L (method: van de Plassche et al., 1999).
Based on the data for linear and branched alkylbenzene sulfonates, linear structures are more toxic than branched structures. Therefore, data on linear materials, e.g., the chronic aquatic studies using LAS, are considered to be a worst case scenario.
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.
