Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Acute test on all three trophic levels were performed to examine the aquatic toxicity of 2 -mercaptoethanol. Daphnia magna turned out to be the most sensitive species revealing an EC50 (48 h) of 0.4 mg/L. Fish and alga turned out to be less sensitive providing a LC50 (96 h) and ErC50 (72 h) of 37 mg/L and 19 mg/L respectively. Thus, 2-mercaptoethanol is considered acutely very toxic for aquatic organisms. Concerning chronic data on aquatic toxicity, a NOEC of 1.7 mg/L was found for algae (growth rate) while the NOEC for daphnids was measured to be 0.0632 mg/L. Thus, 2 -mercaptoethanol is considered chronically very toxic for aquatic organisms.