Studies on solubility of hydroxyapatites.

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  • 種々のヒドロキシアパタイトの溶解性に関する研究

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Abstract

Calium, cadmium and lead hydroxyapatites (Ca-, Cd- and Pb-HAp) were prepared and their solbility was examined in inorganic and organic acid.<BR>Activity solubility products of the hydroiyapatites were calculated from the concentration of metal cation and phosphorus, and pH in the equilibrium solution, resulting in the pKsp values of 115±0.3, 128±0.7 and 158±0.4 for Ca-, Cd- and Pb-HAp, respectively.<BR>During preparation of the apatites, in the range of pH=3.5-6.5 at 37-60°C, a small amount of Cd-HAp was formed in the Cd5H2 (PO4) 4 (H2O) 4 crystals and as a singe phase in the range of pH=5-9 at 100°C. Pb-HAp was prepared at pH=3-12 and was not influencd by temperature.<BR>Except DL-malic acid, tartaric acid and citric acid: The solubility of Ca-HAp in the normal alkyl mono-, di- and tri-basic acids and oxycarboxylic acids in the pH range 4.0-6.5 can be calculated according to an equation as follws, <BR>l·log[Ca2+]total·[OH-]2/1+KcaA·[An-]+m·log[H+]·[P]total=const.<BR>where, KcaA=Stability constant of respective calcium ion complexes with organic acids[An-]=Concentration of organic acid ion

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