Abstract
The influence of the divalent cations Fe 2+, Cu 2+, Zn 2+, Mg 2+, Sr 2+, and Ba 2+ on the growth and dissolution rates of calcite and aragonite has been studied. In most cases the results can be interpreted by a reversible adsorption of the impurity ions at kinks sites according to the Langmuir-Volmer model. Ions of the transition metals show a stronger inhibition than earth alkaline ions. Mg 2+ and Fe 2+ have no influence on growth and dissolution of aragonite. Further, Cu 2+ and Zn 2+ have a stronger effect on calcite, while Sr 2+ and Ba 2+ are more effective on aragonite. Results are used to show consequences for the polymorphic precipitation of CaCO 3.
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