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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The toxicity on algae by Tempo is expected to be above 100 mg/L by a read-across approach.

Key value for chemical safety assessment

Additional information

In an analogous read-across approach, the experimental data of 4 -Hydroxy-Tempo on algae toxicity has been considered for the target substance Tempo. The source substance was tested for toxicity to algae in a 72 h-static test according to OECD guideline 201. The EC50 based on growth rate was assessed at 1038 mg/L. The overall NOEC was determined at 22 mg/L. A similar behaviour regarding toxicity on algae is expected for the target substance. Therefore, the EC50 of Tempo is expected to be at least above 100 mg/L.