Registration Dossier
Registration Dossier
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EC number: 201-279-3 | CAS number: 80-43-3
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Values based on growth rate, to be used for risk assessment:
72-h EC50 > 20 mg/L
72-h 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, cultures of Pseudokirchneriella subcapitata (reported as Selenastrum capricornutum), strain ATCC 22662, were exposed to dicumyl peroxide. The 72-h EbC50 and the 72-h 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, respectively (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.
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