Registration Dossier
Registration Dossier
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EC number: 231-166-4 | CAS number: 7440-58-6
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The solubility of Hf depends on the chemistry of the medium which will lead to chemical reactions (hydrolysis, complexation), in particular the pH value and the species present in the solution.
A Transformation/Dissolution test was conducted following OECD guideline 29 and gives a water solubility of hafnium < 0.012 mg/L
Key value for chemical safety assessment
- Water solubility:
- 0.012 mg/L
- at the temperature of:
- 22 °C
Additional information
Several independent sources of information indicate that hafnium is insoluble.
The solubility of Hf depends on the chemistry of the medium which will lead to chemical reactions (hydrolysis, complexation), in particular the pH value and the species present in the solution.
A Transformation/Dissolution test was conducted following OECD guideline 29 ( Guidance Document on Transformation/Dissolution of Metals and Metal Compounds in Aqueous Media)
In the 24 h screening dissolution test, quantitatively measurable hafnium was not observed in the dissolution media of pH6 -7-8. (<0.012 mg/L). These results show that there is no appreciable hafnium dissolution/transformation in these media.
Based on these results, the long term dissolution tests (7 and 28 days) were not performed.
The solubility of Hf in the absence of complexant is < 0.012 mg/L
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