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The influence of some naturally occuring minerals on the precipitation of calcium carbonate polymorphs (CROSBI ID 85827)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Kralj, Damir ; Vdović, Neda The influence of some naturally occuring minerals on the precipitation of calcium carbonate polymorphs // Water research, 34 (2000), 1; 179-184. doi: 10.1016/S0043-1354(99)00110-4

Podaci o odgovornosti

Kralj, Damir ; Vdović, Neda

engleski

The influence of some naturally occuring minerals on the precipitation of calcium carbonate polymorphs

In this work precipitation of calcium carbonates, influenced by the addition of suspended mineral particles (quartz, kaolinite or montmorillonite) is reported. In the investigated systems the initial concentrations of calcium and carbonate species, as well as the concentration of NaCl, were similar to those in seawater. In the reference system, to which no mineral particles were added, vaterite was the only solid phase precipitating. Quartz and kaolinite had no influence on precipitation, while the addition of calcium montmorillonite caused an instantaneous precipitation of calcite. This was taken as an indication that montmorillonite is a suitable substrate for the overgrowth of this polymorph. The progress of precipitation was followed by measuring the pH value of the solution, while the solid phases were analyzed by means of X-ray diffraction and FT-IR spectroscopy. The samples of calcite were additionally characterized by means of the electron spin resonance spectroscopy, which revealed distortions of the crystal lattice of the calcite epitaxially grown on montmorillonite.

Calcite; Vaterite; Calcium carbonate; Precipitation; Epitaxy; Montmorillonite; Kaolinite

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Podaci o izdanju

34 (1)

2000.

179-184

objavljeno

0043-1354

1879-2448

10.1016/S0043-1354(99)00110-4

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Kemija

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