ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 56, (1) 85 - 88 (2012)


THE KINETICS OF FLUORIDE UPTAKE BY SYNTHETIC HYDROXYAPATITE
 
Gomwe Takudzwa, Booth Samantha E., Nicholson John W.
 
Department of Pharmaceutical, Chemical and Environmental Sciences, School of Science, University of Greenwich, Medway Campus, Chatham, Kent ME4 4TB, United Kingdom

Keywords: Fluoride, Sorption, Kinetics, Hydroxyapatite, Pseudo-second order
 

The kinetics of fluoride uptake by synthetic hydroxyapatite from aqueous solution has been studied. Experiments involved exposing 0.1 g of synthetic hydroxyapatite to 5 cm3 of sodium fluoride solution in the concentration range 100-1000 ppm fluoride and determining fluoride concentration at regular time intervals with a fluoride ion-selective electrode. In all cases, uptake was found to follow pseudo-second order kinetics with correlation coefficients of at least 0.998; all systems equilibrated by 24 hours with equilibrium uptake values that varied with the initial fluoride concentration. The kinetic results differ from those previously reported for much lower concentrations of fluoride, but in the present case, the concentrations were of clinical relevance, as they are those used in fluoride-containing dental products. Further work is necessary to determine how well these findings model uptake by natural hydroxyapatite and hence the extent to which they might apply in vivo.


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