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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information


In a read across-acute aquatic toxicity test with 9 -octadecenoic acid sodium salt to fish the LC50 (96 h) was found to be greater than 100 mg/L


For daphnia, a read across study is available in which the EC50 was determined to be 24 mg/L. Additionally, results of a 21-day read across-study on daphnids are available. An EC50 value of 0.33 mg/L and a NOEC of 0.11 mg/L were determined in this study.


A 72 h algal growth inhibition test was conducted on the analogue substance 9-octadecenoic acid sodium salt to assess the toxicity to aquatic algae. As a result, the lowest EC50 value (determined by the AUG method) was found to be 63 mg/L and the NOEC was determined to be 20 mg/L. In another publication an EC50 (72 h) of 58 mg/L was reported.