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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

EC50 72h > 10mg/L
NOEC 72h >= 0.1mg/L

Key value for chemical safety assessment

Additional information

In a 72 hour toxicity screening study, the cultures of Scenedesmus subspicatus were exposed to the test item at nominal concentrations of 0, 0.1, 1.0 and 10 mg/L under static conditions.  The NOEC and EC50 values based on cell number were < 0.1 and > 10 mg/L, respectively. However, there was no dose response relationship observed. The derived NOEC is only based on cell number and on statistical analysis.

A second study on Pseudokirchneriella subcapitata was performed as a limit test. Algae were exposed to control, vehicle control and test item at nominal concentration of 0.1mg/L (0.016mg/L measured after removal of undissolved test item) under semi-static conditions for 72 hours. The ErC50 72h was >0.016mg/L and the NOErC was 0.016 mg/L which is above the water solubility and no adverse effects were observed throughout the test.

Overall, it can be concluded that the results indicate that the substance is not acutely toxic to algae in the range of solubility.