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Short-term toxicity to aquatic invertebrates

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Description of key information

The key study selected for short-term toxicity to freshwater aquatic invertebrates is the limit test sudy performed on Daphnia magna with a loading rate of 100 mg ZrO2/L. Therefore, in terms of Zirconium element the no acute effect concentration to Daphnia magna is > 74.03 mgZr/L. 

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
74 mg/L

Additional information

Three studies have been validated (Klimish 2) for short-term toxicity to aquatic invertebrates based on read-across with Zr compounds. The selected key study is a limit test performed with zirconium dioxide (ZrO2). In this test, no acute effect on Daphnia magna at an initial loading rate of 100 mg ZrO2/L i.e 74.03 mg Zr/L. This study was selected as key study in comparison to the others since it is the only test that has been performed on the OECD recommended test organisms (daphnids), according to the OECD guideline with very small deviations.

The other available studies support the non toxic effect of zirconium to aquatic invertebrates. Thus, a semi-static toxicity study with ZrOCl2 performed on Tubifex tubifex displayed a EC50 96 hours of 221.18 mgZr/L.

Another study conducted with zirconium metal on Hyallela azteca displayed no effect after 7 days exposure (LC50 >3150 µgZr/L for tap water and >1000 µgZr/L for soft water).

In conclusion, no acute effect of Zirconium has been observed in toxicity tests performed with invertebrates.