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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Experimental testing of adsorption/desorption behaviour of niobium is technically not feasible since the test substance concentration in aqueous phase cannot be measured with sufficient accuracy due to insolubility in water.

In aqueous solution niobium can potentially be oxidized undergoing metal speciation, forming the stable niobium pentaoxide (Nb2O5) and various niobium hydroxyl species depending on pH, temperature and ion strength of the medium. Niobium pentoxide (Nb2O5) and Nb(OH) are poorly soluble and precipitate. However, the metal speciation is not the main removal process of the metallic niobium from 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. Elemental niobium is physiologically inert. It is considered to be harmless and not to accumulate in biota. Under environmental conditions, niobium is present as solid and thus the substance is expected not to be volatile and not to enter into the atmosphere.