Registration Dossier
Registration Dossier
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EC number: 235-117-8 | CAS number: 12069-94-2
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The results showed that niobium carbide (NbC), in an OECD in vitro environment with simulating fresh water conditions, can be considered as insoluble in water.
Key value for chemical safety assessment
- Water solubility:
- 6.47 µg/L
- at the temperature of:
- 21.5 °C
Additional information
A transformation/dissolution (T/D) test, was carried out according to OECD Series on Testing and Assessment No 29 (2001): Transformation dissolution of metals and metal compounds in aqueous media, to study the potential of niobium carbide to release metal ions to the environment.
A 24 hour screening test to determine the pH of maximum niobium release was performed at pH 6 and 8 and a loading rate of 100 mg/L. The pH screening test showed niobium releases of 2.52 ± 0.34 µg Nb/L at pH 8, while the mean release of Nb at pH 6 was 0.80 ± 0.41 μg Nb/L.
The full T/D test was conducted at pH 8. The acute endpoint (7 days) was performed at sample loadings of 1, 10 and 100 mg/L; the chronic endpoint was determined by extending the 1 mg/L loading test to 28 days.
The results of the study documented niobium releasemeasurements as follows:
- 1 mg/l loading after 28 days:of 4.69 ± 1.40 µg Nb/L,
- 10 mg/L loading after 7 days: 6.47 ± 0.61 μg Nb/L, and
- 100 mg/L loading after 7 days: 4.37 ± 0.48 μg Nb/L.
Therefore, niobium carbide is considered insoluble in water.
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