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The kinetics of calcite growth from Ca(HCO,), solutions containing Mg(HCO,), up to a magnesium to calcium ratio of ca. 1 has been measured at 25 "C using a seeding technique. The growth data are analysed using a mechanistic model and the results show the inhibiting influence of magnesium on the growth process. The extent of the inhibition action is found to depend on the state of supersaturation of the mixed solution at the time of the calcite seed addition and the total dissolved magnesium concentration. Analysis using the parabolic rate law was found to be less successful.

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ChemInform Abstract (Ca(HCO3)2 solution containing Mg(HCO3)2) are studied by a seeding technique. Mg is found to inhibit the growth process of calcite. The extent of the inhibition action depends on the state of supersaturation of the mixed solution at the time of the calcite seed addition and the total dissolved Mg concentration. The application of the chemical mechanistic model is more successful for analysis of the growth data than the parabolic rate law.