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EC number: 264-885-7
CAS number: 64417-98-7
Yttrium zirconium oxide is not classified for any environmental hazard.
Therefore, no chemical safety assessment needs to be performed for this
substance. In agreement with Column 2 of REACH Annex IX and X, toxicity
testing with terrestrial organisms may be required when the outcome of
the chemical safety assessment indicates the need for further
investigation for this environmental compartment. However, since no
chemical safety assessment needs to be performed, it is not considered
necessary to fulfil these endpoint requirements. Moreover, for toxicity
to terrestrial plants, in a supporting study (Ferrand et al., 2006), in
which tomato and pea seedlings were exposed for 7 days to two different
soils contaminated with either an insoluble zirconium compound (Zr(OH)4)
or a soluble zirconium compound (zirconium acetate or zirconium
dichloride oxide), no adverse effects were observed on plant growth.
These findings (which are considered relevant for zirconium dioxide)
further support the waiving of terrestrial toxicity tests. The read
across assumption (i.e. the addition of yttrium oxide to the crystal
lattice of zirconium dioxide does not alter the unhazardous character of
zirconium dioxide) is considered validated by comparison of data for
both zirconium dioxide and yttrium oxide for the basic ecotoxicological
endpoints acute toxicity to aquatic invertebrates and toxicity to
aquatic algae (Annex VII ecotoxicological endpoints).
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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