Abstract
The influence of the total concentrations of calcium and phospate ions on the rate of dissolution of calcium hydroxyapatite microcrystals in sub-saturated solutions at constant pH has been studied. The rate of dissolution is found to be a function of [Ca] α[PO 4], where α is 3 for very dilute solutions. For more concentrated solutions α is close to 1.67. The results obtained explain the empirical results found in experiments in which a disc of calcium hydroxyapatite is dissolved in a rotating disc apparatus. The concentrations close to the dissolving surface have been calculated from the bulk concentrations, the diffusion coefficients, and the angular velocity of the disc. The “two-site dissolution” is shown to be an artifact due to mathematical curve fitting, which reproduces the experimental data quite well, but which has no relation to the surface processes governing the dissolution.
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