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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72-h ErC50 is 780 mg/l and the 72-h NOEC is 77 mg/l in Pseudokirchneriella subcapitata.

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
780 mg/L
EC10, LC10 or NOEC for freshwater algae:
77 mg/L

Additional information

Several studies with algae are available; all are conducted according to accepted guidelines. One study was considered invalid as test concentrations could not be maintained and the cell concentration in the controls in all replicates was smaller after 72 hours than after 48 hours (Springborn Laboratories Inc., 1995). From the other studies the most critical study is chosen as the key study. The lowest 72-h ErC50 value is 780 mg/l and the 72-h NOEC is 77 mg/l (SafePharm Laboratories, 2003a). These values are used in the assessment.