The influence of Sr2+on fluoride uptake from monofluorophosphate (MFP) solutions by hydroxyapatite (HAp) has been investigated using adsorption measurements and X-ray photoelectron spectroscopy (XPS). XPS analysis of Sr2+/MFP treated HAp powders indicates that a stoichiometric Sr2+/Ca2+cation exchange occurs on the HAp surface. Complete exchange of surface Ca2+occurs at Sr2+concentrations >0.02 mol dm-3forming a Sr HAp layer. Fluoride adsorption measurements reveal an increase in fluoride uptake with increasing Sr2+concentration in the treatment solution. XPS data also show that fluorapatite (FAp) formation increases with increasing Sr2+concentration and that a linear correlation exists between FAp formation and surface Sr2+. The data further suggest the formation of MFP-like particles or precipitates on the HAp surface. © 1991.
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