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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Description of key information

The growth rate EC50 of 2-methylpropane-2-thiol was 24 mg/l and the NOEC was 6.41 mg/l. The biomass EC50 was 13 mg/l and the NOEC was <6.41 mg/l.

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
24 mg/L
EC10, LC10 or NOEC for freshwater algae:
6.41 mg/L

Additional information

Thiebaud (1999) is a GLP compliant proprietary study, which follows the OECD guideline 201. Concentrations were not maintained within 80% of the initial concentrations so a geometric mean was used as according to OECD 201, calculated from the initial and final concentrations. This study is considered reliable and suitable for use as a key study for this endpoint.