Registration Dossier
Registration Dossier
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EC number: 235-310-7 | CAS number: 12163-26-7
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Aquatic toxicity studies with magnesium diniobate are not available, thus aquatic toxicity will be addressed with existing data on the dissociation products, i.e. magnesium and niobium ions.
Magnesium: Magnesium as an essential element has a very low potential for toxicity to freshwater and saltwater invertebrates and respective endpoints are above respective OECD test limits.
Niobium: displays a very low mobility under all but the most extreme environmental conditions due to the high stability and very low solubility of niobium oxides. In a supporting study, the lowest reported LC50 for Hyalella azteca amounts to 26 microg/L.
Magnesium diniobate: The solubility of magnesium diniobate (MgNb2O6) in environmental media is expected to be low since dissolution in water resulted in Mg concentrations < 25 microg/L and Nb concentrations < 0.2 microg/L after 34 days. Thus, in accordance with Column 2 of Annex VII of Regulation (EC) No 1907/2006 "aquatic toxicity is unlikely to occur since the substance is highly insoluble in water". Aquatic toxicity is also unlikely to occur since reported EC/LC50 values for magnesium and niobium are at least 100-fold above the respective magnesium and niobium concentrations measured after dissolution in water for 34 days.
Key value for chemical safety assessment
Additional information
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