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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Key study. Test method EU Method C3, OECD 201. GLP study. The 72h-EC50 was determined to be 11.69 mg/L in algae (based on measured concentration and growth rate) in algae in a closed static system. The 72h-NOEC was 3.37 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
11.69 mg/L
EC10 or NOEC for freshwater algae:
3.37 mg/L

Additional information

Key study: The effect of test item was assessed on algal growth using the unicellular green alga Pseudokirchneriella subcapitata, over an exposure period of 72 hours in a closed system, according to EU Method C3 and OECD Guideline 201. Based on preliminary range-finding studies, algae were exposed to nominal concentration of 0 (control, 6 replicates), 6.25, 12.5, 25, 50 and 100 % v/v saturated solution (corresponding measured geometric mean 0, 1.73, 3.37, 6.72, 13.79 and 27.96 mg/L). The 72h-EC50 was determined to be 11.69 mg/L in algae (based on measured concentration and growth rate) in algae in a closed static system. The 72h-NOEC was 3.37 mg/L.