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Ecotoxicological information

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Description of key information

Daphnia are the most sensitive species with a short-term EC50 of 270 µg/L and a long-term NOEC of 5.8 µg/L

Additional information

Short-term toxicity:

The acute aquatic toxicity of 2-ethylanthraquinone was tested in short-term tests on the toxicity to algae, daphnids and fish. The results were as follows:

 Organism  LC50 or EC50

>370 µg/L


270 µg/L

 Algae (growth rate)

>280 µg/L

Daphnids were the most sensitive species with an EC50 after 48h of 270 µg/L. For algae, the EC50 biomass (not relevant for classification purposes) was 280 µg/L. No toxicity effects were observed in fish at concentrations tested up to 370 µg/L.

Long-term toxicity:

An algae toxicity test is available which can be considered as a long-term study. The observed NOEC for algal growth rate was 150 µg/L.

A long-term daphnia magna reproduction test (21days) has been conducted, representing the most sensitive species. The observed NOECs for immobilization and reproduction are 5.8 µg/L and 21 µg/L, respectively. The lower value, 5.8 µg/L, is used in the environmental risk assessment.