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- W4240127146 abstract "Significant solubility of a sintered hydroxyapatite (HAp) tablet was observed by soaking in aqueous suspension with strongly acidic ion exchange resin, H-form (H-R), compared with the conventional chemolysis reagent for renal calculi. The pH value after soaking was nearly 2 for self-exhausted H3PO4 by the ion exchange reaction. The dissolution tendency of an HAp tablet depended on the pH value of H3PO4 solution used. From these facts, the dissolution mechanism of HAp in aqueous suspension with H-R was studied for various suspensions with 0-3.0g of H-R and 0-600mg of HAp powders. Analysis of Ca2+ and PO43- by ion chromatography and measurements of pH and specific conductivity were performed for the filtrate, and Ca/PO4 molar ratio values thus obtained were discussed from the view point of formation of soluble Ca(H2PO4)2. Variations in these parameters can be expressed as contour maps on the plane of HAp (mg) and H-R (g) axes. In conclusion, the dissolution of HAp proceeds by the cation exchange reaction with H-R (Eq. 1) followed by the successive exchange reaction in the presence of sufficient of H-R (Eq. 2).Ca10(PO4)6(OH)2+14(H-R)→3Ca(H2PO4)2+7Ca-R2+2H2O (1) Ca(H2PO4)2+2(H-R)→Ca-R2+2H3PO4 (2)Furthermore, H3PO4 formed by Eq. (2) contributes to successive dissolution of HAp to enhance the solubility." @default.
- W4240127146 created "2022-05-12" @default.
- W4240127146 creator A5001564528 @default.
- W4240127146 date "1988-01-01" @default.
- W4240127146 modified "2023-09-30" @default.
- W4240127146 title "Dissolution of Sparingly Soluble Inorganic Compound to Aqueous Suspension with Ion Exchange Resin (Part 1)" @default.
- W4240127146 doi "https://doi.org/10.2109/jcersj.96.825" @default.
- W4240127146 hasPublicationYear "1988" @default.
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