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EC number: 264-885-7
CAS number: 64417-98-7
Hydrolysis is not considered to be a relevant process determining the
environmental fate of yttrium zirconium oxide. Due the limited water
solubility of the substance, it is anticipated that the substance
predominantly remains an insoluble mass in the environment and only to a
limited extent hydrolysis processes will occur.
Due to its inorganic nature, biodegradation is not a relevant process
determining the environmental fate of yttrium zirconium oxide and
therefore no studies need to be performed.
Due to its limited water solubility, the substance is not expected to
give rise to substantial levels of bioavailable yttrium or zirconium in
the aquatic or terrestrial environment. Any bioavailable yttrium or
zirconium may be taken up by organisms, however, bioaccumulation
potential has been demonstrated to be limited for both elements. For
zirconium, reliable data on bioaccumulation in the aquatic environment
are available only for algae and cyanobacteria. The highest BCF value
was 0.064 L/kg ww, indicating no potential for bioaccumulation. For
yttrium, reliable data are available for aquatic plants, aquatic
invertebrates, and fish. BCF/BAF values were 992.7, 27.36 to 1482.6, and
1.3 to 54 L/kg ww, respectively. As for other rare earth elements,
bioaccumulation was observed to decrease when ascending the food chain.
The key BAF value for fish was 4.65 L/kg ww, indicating a very low
potential for bioaccumulation in the aquatic environment. For the
terrestrial environment, based on available data for both zirconium and
yttrium, it can be concluded that there is no potential for
bioaccumulation, as all reported BSAF values were well below 1.
Transport and distribution
Based on available data, both yttrium and zirconium can be concluded to
strongly adsorb to particulate matter, adsorption being however somewhat
less pronounced in soil compared to sediment and suspended matter. Log
Kp values for zirconium were 5.0, 5.47 and 4.13 for suspended matter,
sediment and soil, respectively. For yttrium, log Kp values of 4.78 and
3.59 were obtained for sediment and soil, respectively. No data were
available for suspended matter. However, due to the limited water
solubility of yttrium zirconium oxide, only minor amounts of yttrium and
zirconium are expected to be available for adsorption processes and
hence adsorption is not considered to be a major process determining the
environmental fate of the substance. It is anticipated that the majority
of the substance remains an insoluble mass in the 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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