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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The concentrations of test item causing a 50 % and 10% reduction in growth rate were estimated:
72h- EC50 = 1.6 mg/L (95% CI: 1.3 - 1.9 mg/L)
72h- EC10 = 0.64 mg/L (95% CI: 0.48 - 0.82 mg/L)

Key value for chemical safety assessment

EC50 for freshwater algae:
1.6 mg/L
EC10 or NOEC for freshwater algae:
0.64 mg/L

Additional information

This study was designed to determine the effects of test item on the growth of Pseudokirchneriella subcapitata over a 72h period, according to the OECD 201 Guideline.

Due to low water solubility (close to 10 mg/L), the test solutions were prepared from a saturated stock solution, prepared using slow-stirring conditions.

The results are reported as growth rate and biomass inhibitions. As the stability of the substance was not confirmed over the test period, geometric means of measured concentrations were used to determine EC10 and EC50.