Registration Dossier
Registration Dossier
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EC number: 939-960-9 | CAS number: 39318-32-6
Endpoint summary
Administrative data
Description of key information
Additional information
Magnesium zirconium oxide has a low water solubility and based on the results of the leachability tests performed by Eidam (2015, 2016) with magnesium zirconium oxide and the water solubility test performed by Paulus (2010) with zirconium dioxide, it is clear that only limited amounts of magnesium and zirconium will be released from the substance to the aqueous part of the environmental compartment under consideration, and may become available for uptake by aquatic or terrestrial organisms. Nevertheless, information on bioaccumulation of magnesium and zirconium in aquatic and/or terrestrial organisms was added to the dossier.
The available information on bioaccumulation of zirconium in the aquatic and terrestrial foodchain was studied in algae and higher terrestrial plants respectively, yielding the following conclusions:
- Although no data are available on other aquatic organisms besides algae and cyanobacteria, it can be concluded that zirconium has no potential to bioconcentrate/bioaccumulate in the aquatic foodchain. A rapid uptake of zirconium from the medium was observed as well as a rapid desorption. The BCF values obtained for cyanobacteria and microalgae were very low, the highest value being 0.064 L/kg ww.
- Based on a study on the transfer of zirconium from soil to plants, it could further be concluded that there is no potential for bioaccumulation of zirconium in the terrestrial foodchain, as all BSAF values were < 0.1, which is well below 1.
Bioaccumulation is not considered relevant for magnesium as magnesium is an essential element and internal magnesium levels are actively regulated by organisms. Experimental data on transfer of magnesium from soil to terrestrial plants are added to the dossier. BSAF values > 1 were observed in this study, however, this could be expected based on the essentiality of the element. Moreover, it is clear that the observed BSAF values increase with decreasing magnesium content in the soil. This is a typical observation for essential elements.
Based on the information available for magnesium and zirconium, it can be concluded that there is no concern for bioaccumulation of magnesium or zirconium in the aquatic or terrestrial foodchain upon release of magnesium zirconium oxide to the environment.
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