Registration Dossier
Registration Dossier
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EC number: 231-113-5 | CAS number: 7440-03-1
Endpoint summary
Administrative data
Description of key information
Additional information
The defining characteristic of the niobium metal is its insolubility in water (max. 0.8 µg/L). Due to the low redox potential of niobium, in aqueous solution niobium can potentially be oxidized undergoing metal speciation and forming the stable niobium pentoxide (Nb2O5) and various niobium hydroxyl species depending on pH, temperature and ion strength of the medium. Niobium pentaoxide (Nb2O5) and Nb(OH) are poorly soluble and precipitate. However, the metal speciation is not the main removal process of the metallic niobium from the aquatic environmental compartment. Transformation of the metallic niobium is considered to be slow considering the 28 days Transformation-Dissolution tests performed for niobium in its massive or granular form (FeNb) as presented in the technical dossier chapter 4.8.
Due to its insolubility in water, bioaccumulation is unlikely. In addition, Niobium is shown not to be bioavailable under physiological relevant conditions (see technical dossier chapter 7.1 on toxicokinetics). Thus even after oral ingestion, Niobium is not expected to bio-accumulate. Niobium is not volatile and does not enter into the atmosphere. Biodegradation cannot be assessed since niobium is inorganic.
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