The influence of impurities on the growth rate of calcite

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Abstract

The effects of 34 different additives on the growth rate of calcite were investigated. An initial growth rate of about one crystal monolayer (3 × 10-8 cm) per minute was adjusted at a constant supersaturation which was maintained by a control circuit. Then the impurity was added step by step and the reduction of the growth rate was measured. The impurity concentration necessary to reduce the initial growth rate by a certain percentage increased in the order Fe2+, ATP, P3O5-10, P2O4-7, (PO3)6-6, Zn2+, ADP, Ce3+, Pb2+, carbamyl phosphate, Fe3+, PO3-4, Co2+, Mn2+, Be2+, β-glycerophosphate, Ni2+, Cd2+, “Tris”, phenylphosphate, chondroitine sulphate, Ba2+, citrate, AMP, Sr2+, tricarballylate, taurine, SO2-4, Mg2+ by 4 orders of magnitude. The most effective additives halved the initial growth rate in concentrations of 2 × 10-8 mol/1. For Fe2+ the halving concentration was nearly proportional to the initial rate. The mechanism of inhibition by adsorption of the impurities at growth sites (kinks) is discussed.

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    Presented at the annual meeting of the DGKK in Stuttgart 29.9.1977 and at ECCG-2 in Lancaster 11.9.1979.

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