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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Values based on growth rate, to be used for risk assessment:
72hr EC50 > 20 mg/L
72 hr NOEC = 8 mg/L

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
8 mg/L

Additional information

In a 72 hour acute toxicity study, the cultures of Pseudokirchneriella subcapitata (reported as Selenastrum capricornutum), strain ATCC 22662, were exposed to dicumyl peroxide. The 72h EbC50 and 72h NOEbC values based on cell density were > 20 mg/L and 3.20 mg/L, respectively (nominal). The 24-48 h ErC50 and the 24 -72 h ErC50 were both > 20 mg/L, whereas the 24-48 h NOEC and 24-72 h NOEC values based on growth rate were 8 mg/L, each (nominal).

These results are supported by a second study. Effect concentrations based on growth rate of cultures of Selenastrum capricornutum (new name: Pseudokirchneriella subcapitata) were ErC50 > 1000 mg/L and NOEC (growth rate) of 10 mg/L, respectively. The effect concentration based on biomass was EC50 > 1000 mg/L. The NOEC for biomass was not determined in this test, but was < 10 mg/L.

Both studies indicate no effect up to maximum water soluble concentrations.