Registration Dossier
Registration Dossier
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EC number: 201-535-4 | CAS number: 84-51-5
Endpoint summary
Administrative data
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 |
| Fish | >370 µg/L |
| Daphnia | 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.
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