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EC number: 231-176-9
CAS number: 7440-67-7
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.
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
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.
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