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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Data are available in an OECD guideline study under GLP conditions.

Key value for chemical safety assessment

EC50 for freshwater algae:
97 mg/L
EC10 or NOEC for freshwater algae:
97 mg/L

Additional information

In an OECD TG 201 study, algae (Pseudokirchneriello subcapitata) were exposed for 72 hours to mean measured concentrations of 3.0, 5.8, 12, 24, 47 and 97 mg/L (Springborn Smithers, 2006, RL= 1). The 72 hr EbC50 and ErC50 values (biomass and growth rate) were both greater than the highest mean measured dose tested (>97 mg/L).  The mean measured NOEC for growth inhibition based on the biomass endpoint was considered to be 47 mg/L and 97 mg/L for the growth rate endpoint.