ChemInform Abstract: Dissolution of Synthetic Hydroxyapatite in the Presence of Lanthanum Ions.
Abstract
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ChemInform Abstract
The interaction of La3+ ions with hydroxyapatite (HAP) in neutral and acidic solutions (pH 5) is investigated with regard to the acid resistance of tooth enamel. Addition of La3+ to an equilibrated suspension of HAP in H2O at pH 7.0 induces dissolution of HAP up to equilibrium (pH 6.6) with LaPO4 precipitation up to the non-congruent equilibrium of solubility of pure HAP. Studies on the dissolution kinetics of a HAP suspension equilibrated in the presence of LaCl3 at pH 5 show that no acid resistant precipitate of LaPO4 is formed on the HAP surface.
