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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

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

>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.