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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

2-mercaptoethanol is acutely very toxic to aquatic invertebrates.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
0.4 mg/L

Additional information

To determine the toxicity of 2-mercaptoethanol to aquatic invertebrates, a GLP-study according to OECD TG 202 using Daphnia magna was performed (Elf Atochem 1999). As the detection limit was 0.5 mg/l and thus for the nominal concentrations below 0.9 mg/l no test substance could be determined analytically, a linear extrapolation method was used to calculate effective concentrations. By doing this an EC50 (48h) value in this study of 0.4 mg/l was estimated.