Abstract
The dependence of the true rate of decomposition of fluorapatite and hydroxylapatite in nitric, sulfuric, and orthophosphoric acids on the concentration of a surfactant (cetylpyridinium chloride and sodium dodecyl sulfate) was experimentally studied. The electrokinetic potential in the slip plane of the double electric layer at the interface between apatite and an aqueous solution of a surfactant was measured by the electroosmotic method. The concentrations of cetylpyridinium chloride (5.5 × 10–6 mol/l) for fluorapatite and sodium dodecyl sulfate (1 × 10–4 mol/l) for hydroxylapatite were found, which correspond to the isoelectric state of the surface of the solid phase. It was established that the true rate of decomposition of apatites is maximal when the electrokinetic potential is zero.
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