Registration Dossier
Registration Dossier
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EC number: 237-324-9 | CAS number: 13746-89-9
Endpoint summary
Administrative data
Description of key information
Additional information
Water soluble zirconium salts like zirconium(tetra)nitrate, zirconium(tetra)chloride, zirconium oxychloride and zirconium dioxide once in aqueous media dissociate very quickly under neutral conditions. (Daunderer, M.; Lehrbuch Klinische Toxikologie, 89. Erg. Lfg.; 11/94).
Zirconium nitrate, once in water, dissociates into nitric acid and zirconium dinitrate oxide, which undergoes instantaneous hydrolysis under neutral conditions forming hydrated forms of zirconium dioxide (the most stable form of zirconium in water). This is anticipated to be representative for environmental conditions. Therefore toxicity tests conducted with other soluble zirconium salts are suitable to characterise the effects of zirconium(tetra)nitrate. Tests with zirconium metal can be regarded as worst case scenario as dissociation of zirconium(tetra)nitrate will not lead to free zirconium metal in aqueous media.
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