Registration Dossier

Physical & Chemical properties

Water solubility

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Aluminium Zirconium Chloride Hydroxide is very soluble in water. It is produced and marketed in aqueous solutions containing between ca. 27 and 51% (mass), i.e. ca. 270-510 g/L. The viscosity of aqueous solutions increases with concentration and gelation is observed towards higher concentrations.

A defined numeric value for an equilibrium water solubility cannot be determined for this substances(e.g. according to method OECD 105).

Further, the chemistry of the relevant metals aluminium and zirconium in aqueous solutions is complex. Depending on concentrations, pH and other ions being present, Al and Zr do not exist as simple metal cations, but instead form various species, most relevantly hydroxides and hydroxide-oxides.

To obtain information on the solubility and speciation behaviour at environmentally and physiologically relevant concentrations, a reduced testing programme was conducted in purified water and in reconstituted water (target pH=6 and 8). The results are presented in two separate endpoint records in the technical dossier.