Registration Dossier
Registration Dossier
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EC number: 232-051-1 | CAS number: 7784-18-1
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
In the aquatic environment, the substance is expected to hydrolyse to hydroxy-aluminium species. No rate information is available on this hydrolysis pathway, but it would be expected to be sufficiently rapid to prevent the substance from persisting in environmental waters.
Key value for chemical safety assessment
Additional information
Information regarding hydrolysis was sourced from a literature article reporting computer-aided QSAR estimates of the speciation of the substance in aqueous media utilizing SOLGASWATER (version Win SGW) model. The author states that the binding of fluoride to aluminium is considerably weaker that that of the hydroxide ion, and that the substance will hydrolytically exchange fluoride for hydroxide, depending on both the pH and the fluoride concentration. Low pH (i.e. < pH ~6) and higher fluoride concentrations would favour more highly fluorinated/less highly hydroxylated species, and higher pH (i.e. > pH ~6) and lower fluoride concentrations would favour less highly fluorinated/more highly hydroxylated species. The author also states that calcium forms a less soluble fluoride than aluminium. Although, in principle, this hydrolytic exchange of fluoride and hydroxide ligands is expected to be reversible, the equilibrium is expected to drawn far towards hydroxylated aluminium species in environmental waters where the availability of hydroxide is expected to be far higher than that of fluoride, and where calcium is also expected to be commonly available to remove fluoride ions via precipitation as solid CaF2. No rate information is available on this hydrolysis pathway, but it would be expected to be sufficiently rapid to prevent the substance from persisting in environmental waters.
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