Abstract
The kinetics of dissolution of calcium fluoride crystals has been studied in sodium chloride solutions at 25°C in the presence of zinc, magnesium, lead and aluminium ions, using a constant-composition method, in which the undersaturation and ionic strength were maintained constant. With the exception of zinc, the addition of metal ions, even at relatively low concentration (5X10 -5 mol dm -3), markedly retards the rates of dissolution of calcium fluoride crystals. Moreover, the effect was enhanced as the relative undersaturation decreased. The subsequent blocking of dissolution sites by the adsorbed ions can be interpreted in terms of a Langmuir isotherm. Direct adsorption experiments have also been made by using magnesium ions. Comparison of the kinetically derived equilibrium constants with the directly measured adsorption equilibrium constant showed increasing kinetic equilibrium constants with decreasing relative undersaturation.
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