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EC number: 939-967-7
CAS number: -
Acute toxicity to aquatic invertebrates
Acutely, zirconium dioxide was not found to be harmful to aquatic invertebrates, as demonstrated in an OECD 202 guideline study, in which no significant immobilisation was observed at an initial nominal loading rate of 100 mg/L.
In a similar OECD 202 guideline study for erbium oxide, no significant immobilisation was observed in a 100% v/v saturated solution of erbium oxide in the test medium.
Acute toxicity to fish
An OECD 203 study with zirconium dioxide, in which no mortality or other adverse effects were observed at a (nominal) concentration of 100 mg/L, indicated that zirconium dioxide is not acutely harmful or toxic to fish.
Toxicity to algae
Studies with zirconium compounds, whether 'water soluble' or insoluble, indicate that the observed growth inhibitory effects can be attributed to phosphate depletion of the test medium. Zirconium forms strong complexes with phosphate and therefore, when in excess, precipitates all phosphate from the test medium. No evidence has been found for direct toxic effects to occur to algae upon exposure to zirconium compounds. The phosphate depletion effect in limited systems such as used during aquatic ecotoxicity tests is not considered environmentally relevant and therefore zirconium dioxide and the tested zirconium compounds are not considered toxic to algae.
A similar phosphate complexing behaviour is known for rare earth elements such as erbium. Because phosphate complexation in algal growth inhibition tests hampers the generation of meaningful test results, it was decided not to add experimental data on the effect of erbium oxide or other erbium compounds on algal growth to this dossier.
Conclusion on erbium zirconium oxide
It is expected that the substance will have a similar aquatic ecotoxicity profile as the read across substances zirconium dioxide and erbium oxide, more specifically that it is not expected to cause any adverse effects on living organisms in the aquatic environment.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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