Abstract
Fluoride ion interaction with synthetically prepared goethite has been investigated over a range of pH values (4–9) and F− concentrations (10−3−10−5 M). The amount of F− retained by goethite suspensions was found to be a function of pH, media ionic strength, F− concentration, and goethite concentration. The lowest ionic strength (0.001 M KNO3) gave the highest adsorption medium. Uptake was minimal at pH >7 and increased with decreasing pH. Thermodynamic properties for fluoride adsorption at 298 K and 323 K were investigated. The isosteric heat of adsorption (δH r) was calculated and the heterogeneity and homogeneity of the surface examined for goethite. In view of the importance of fluoride in dental health, the interaction of fluoride on goethite in the physical environment has important implications on dental epidemiology.
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