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- W2015409369 abstract "The precipitation of calcium phosphate from stable supersaturated solutions was studied under conditions of pH/Ca-stat and pH-stat. The pH and Ca2+ activity of the titrand were kept constant by means of specific ion electrodes coupled to automatic titrators. The precipitation was initiated by the addition of well-characterized Domino soil, which had no identifiable calcium phosphate solids. The precipitate was characterized as CaHPO4·2H2O (DCPD) by x-ray diffraction, scanning electron microscopy, energy dispersive x-ray, chemical analysis, and equilibrium solution data. The rate of precipitation was compared using H+, Ca2+, and H2PO-4 data. The rate of H+ release was shown to be the most reliable indicator of the rate of precipitation under the chosen experimental conditions. The proton release data were used to calculate the empirical order of reaction (n) and the rate constant (log K). Under conditions of pH/Ca-stat, n was found to be 1.73 ± 0.17 and log K was found to be 2.60 ± 0.60. Under conditions of pH-stat, n was found to be 1.27 ± 0.12 and log K was found to be 0.69 ± 0.44. No relationship was found between the amount of seed material used and the kinetic parameters under the chosen experimental conditions." @default.
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- W2015409369 date "1987-01-01" @default.
- W2015409369 modified "2023-09-25" @default.
- W2015409369 title "Kinetics of Heterogeneously Initiated Precipitation of Calcium Phosphates1" @default.
- W2015409369 doi "https://doi.org/10.2136/sssaj1987.03615995005100020014x" @default.
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