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Title: Effect of Mg2+ on the kinetics of calcite crystal growth
Authors: Lin, Y.-P. 
Singer, P.C.
Keywords: A1. Inhibition
A1. Langmuir model
B1. Calcite
B1. Magnesium
B3. Crystal growth
Issue Date: 15-Dec-2009
Citation: Lin, Y.-P., Singer, P.C. (2009-12-15). Effect of Mg2+ on the kinetics of calcite crystal growth. Journal of Crystal Growth 312 (1) : 136-140. ScholarBank@NUS Repository.
Abstract: The effect of Mg2+ on the kinetics of calcite crystal growth was investigated using calcite-seeded solutions with a pH-stat system. Five different solution compositions with the same degree of supersaturation with respect to calcite but different CO3 2-/Ca2+ molar ratios were employed in this study. In the presence of Mg2+, calcite crystal growth rates showed a linear decrease with increasing Mg2+ concentration for the five different solutions employed. By normalizing the crystal growth rate in the presence of Mg2+ to that in the absence of Mg2+, the rate reductions in the five solutions converge to a single line when plotted against the molar ratio of Mg2+/Ca2+. The widely used "empirical degree of supersaturation model" and the simple "Langmuir adsorption model" cannot explain the observed effects of the Mg2+/Ca2+ ratio on the inhibition of calcite crystal growth. Instead, a competitive Langmuir adsorption model involving Ca2+ and Mg2+ was shown to better fit the experimental data. © 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Crystal Growth
ISSN: 00220248
DOI: 10.1016/j.jcrysgro.2009.09.041
Appears in Collections:Staff Publications

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