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|Title:||Effect of Mg2+ on the kinetics of calcite crystal growth||Authors:||Lin, Y.-P.
A1. Langmuir model
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. https://doi.org/10.1016/j.jcrysgro.2009.09.041||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/87491||ISSN:||00220248||DOI:||10.1016/j.jcrysgro.2009.09.041|
|Appears in Collections:||Staff Publications|
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