Abstract
The distribution behavior of cadmium between precipitates of calcite and aragonite, and saturated aqueous solutions were studied at 15, 25, 40 and 50°C. Calcium carbonate crystal was precipitated from calcium hydrogencarbonate solutions by homogeneous precipitation method. Aragonite crystal was precipitated from the solution containing magnesium perchlorate. The logarithmic distribution law ruled these systems, and the distribution coefficient, λ, was calculated from the concentration of cadmium and calcium in the solution. By using the ratio of solubility product constants Kcaleite/Kcdco3=731, Karagonite/Kcdco3=1010, and distribution coefficients λcal=350, λarg=6.23, excess free energy values were calculated as Δμcal=1.76 kJ mol-1, Δμarg=12.5 kJ mol-1 at 25°C. The difference of these values is dependent on the fact that calcite and cadmium carbonate crystals belong to hexagonal system, but aragonite crystal belongs to rhombic one.
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