Nanocrystals of magnesium and fluoride substituted hydroxyapatite

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Ion selective electrodes, potentiometry, and potentiometric titrations.

Fluoro substituted hydroxyapatite (FHAp) samples were prepared by a cyclic pH method Both calcined and uncalcined samples were subjected to elemental analysis (F, Ca, P) and X-ray diffraction (XRD) analysis to verify composition and phase purity Good correlation between a-axis parameters and fluoride ion content was found for calcined samples, however, for uncalcined samples the fluoride ion content was higher than estimated from the a-axis values Fourier transform infra red (FT-IR) spectroscopy analysis of the calcined samples showed OH band shifts and splitting in accordance with F-HO interactions affecting the OH vibration We conclude that the OH libration (620–780 cm-1 range) is more suited for estimation of fluoride ion content than the OH stretching In contrast, uncalcined samples all displayed FT-IR spectra similar to that of hydroxyapatite (HAp) despite the presence of fluoride ions (18–73%) FT-IR emission spectroscopy was used to probe the changes occurring in the FT-IR spectra of HAp and FHAp samples upon heating Interpretation of the spectral changes occurring during heating to 1,000 °C and subsequent cooling is given Room temperature spectra of samples heated to various temperatures was used to determine the temperature necessary to produce FT-IR spectra displaying the expected OH bands A model accounting for the combined observations is proposed

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FT-IR spectroscopy of fluoro-substituted hydroxyapatite: strengths and limitations.

Theory and applications of ion-selective electrodes part II

– The concentrations of 12 different elements were measured in dentin and enamel of primary and permanent teeth collected in six different localities in Finland. Na, Cl, Al, Mn, Ca, and P were determined by neutron activation analysis, K, Mg, Zn, Cu, and Fe by the atomic absorption method, and F with the fluoride-specific electrode. Most elements were present in higher concentrations in the enamel than in the dentin: Mg, however, was higher in the dentin. Compared with the permanent teeth, the primary teeth contained more K and Mn in enamel and K and Mg in dentin, but less Na and Zn in enamel. Differences between the six localities were significant for F, Cl, K, Zn, Na, and Mn. Fe, Cu, and Mn contents of teeth were much lower in Finland than elsewhere; in the typical Finnish diet the contents of Fe and Cu are relatively low and iron deficiency anemia is unusually common in Finland.

Mineral composition of enamel and dentin of primary and permanent teeth in Finland.

Determination of fluoride in calcium phosphates with a fluoride-selective electrode

The use of triethanolamine in a buffer for the determination of fluoride in calcium and transition metal orthophosphates, using a fluoride-selective el

J.L. Stuart

Papers

Determination of fluoride in calcium phosphates with a fluoride-selective electrode

The use of triethanolamine in a buffer for the determination of fluoride in calcium and transition metal orthophosphates, using a fluoride-selective el