Abstract

The transformation kinetics of aragonite a metastable form of CaCO 3, to the stable form calcite has been measured for the heterogeneous system of solids in contact with solutions of alkaline-earth metal ions at 50°C. The kinetic data are consistent with the expression, 1n x/(1 − x) = kt, where x is the fraction of calcite at a given time, t. Under conditions of constant pH and temperature, the rate constant k is a function of the concentration of the non-common alkaline-earth metal ion, all of which tend to inhibit the recrystallization at higher concentrations. The inhibiting concentrations (as 10 5 M) are: Be, < 4·7; Mg, 56; Sr, 60 Ba, 72. These data can be correlated with the coordinating tendencies of the non-common metal ion.

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