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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Link to relevant study record(s)

Description of key information

The 48 h EC50 of ethanethiol to Daphnia magna was <0.1 mg/L, the limit of detection in this experiment; 0% immobilisation was observed at a nominal test concentration of 0.05 mg/L. The 24 hr EC50 was 0.38 mg/L. This was a guideline, GLP study and therefore is considered reliable and suitable for use as the key study for this endpoint. Determination of test item concentration at critical concentrations was limited by limitations of detection equipment and the study is therefore acceptable with restrictions.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
0.1 mg/L

Additional information

The key study for acute aquatic invertebrate toxicity (Boutonnet, 1994) was a 48 hour static, freshwater GLP study with analytical monitoring following OECD guideline 202. The determination of test item concentration at critical concentrations was limited by limitations of detection equipment meaning the study is only acceptable with restrictions. It is still considered to be suitable for use as key study for this endpoint.