Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium and barium ions.

Kitano, Yasushi; Tokuyama, Akira; Arakaki, Takemitsu

doi:10.2343/geochemj.13.181

Cited by 38 publications

(15 citation statements)

References 29 publications

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“…The se quence of the inhibition effect of ions on the Mg" ion adsorption is as follows: phos phate > Ba2+, F > Ca2+. This sequence is consistent with that of the power of ions forming calcitic carbonate from solution containing Mg" ions (53.5 mM): phosphate (0.05-0.5 mM) > citrate(0.2 mM, 1966), Ba2+(0.25 mM, 1979a), F-(0.5 2.5 mM) > alkalinity(10-50 mM, 1983) > Ca2+(50 mM, Tomiyama and Kitano, 1984 Several authors have mentioned the polymor phic crystallization of calcium carbonate. The first concept is based on the thermodynamical consideration (Berner, 1975): Dissolved Mg" ions in solution, which favor aragonite precipita tion from the solution, have a strong retarding effect on the calcite growth, whereas they have no effect on the aragonite growth.…”

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confidence: 68%

Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium ions in the presence of fluoride and phosphate ions.

1988

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Magnesian calcites were precipitated from 10 mM Ca(HCO3)2 (Ca 2+, 400 mg/1) solutions contain ing 35 or 53.5 mM Mg ions (Mg2+, 850 or 1300 mg/1) in the presence of fluoride and phosphate ions in various concentrations. Magnesian calcite formation from aqueous solution was favored by the presence of fluoride ions (0.5 to 2.5 mM) or phosphate ions (0.025 to 0.5 mM) in a parent solution. Aragonite and/or monohydrocalcite are formed below or above the critical concentrations of these ions. The presence of phosphate or fluoride ions in a solution inhibits adsorption of Mg2+ ions on calcite surface, which may cause the magnesian calcite formation.

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confidence: 68%

Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium ions in the presence of fluoride and phosphate ions.

1988

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“…Other authors who have studied the precipitation of calcium carbonate by inorganic processes have shown that calcite formation is inhibited and aragonite formation increases with increasing Mg concentration (Cailleau et al, 1977;Kitano et al, 1979;Sayoko and Kitano, 1985). This is the tendency shown by the biominerals precipitated by N. halobia (Table 1) and di erentiates it from other moderately halophilic bacteria investigated in liquid media (Rivadeneyra et al, 1993(Rivadeneyra et al, , 1997, where the opposite occurs.…”

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confidence: 99%

Precipitation of carbonates by Nesterenkonia halobia in liquid media

et al. 2000

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We investigated the precipitation of carbonates by Nesterenkonia halobia in a liquid medium at di erent concentrations of salts and incubation times. N. halobia only produced crystals at salt concentrations of 2.5%, 7.5% and 15%. At 20% salt concentration no crystal formation was observed. Calcite, aragonite and dolomite were precipitated in di erent quantities, depending on the salinity of the medium and incubation time. Scanning and transmission electron microscopy, microanalysis and electron di raction were all used to study in detail the morphology, composition and internal structure of the bioliths. We propose a mechanism for biolith formation involving both biological and inorganic processes. Ó

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“…tions at low temperatures and pressures have also been attempted by Kitano and Kanamori (1966), Glover and Sippel (1967), Liebermann EXPERIENTAL PROCEDURES (1967), Oomori (1974), Ohde and Kitano Protodolomite was synthesized in sea (1978), Kitano et al (1979), and Oomori et al water with varying Mg"/Ca" ratios by adding (1983), but the synthesis of protodolomite dioxane and 0.4M Na2CO3 solution at 40°C. from sea water under normal conditions has Different starting solutions were prepared been unsuccessful.…”

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Synthesis of protodolomite from sea water containing dioxane.

Oomori

Kitano

1987

Geochem. J.

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Protodolomite was synthesized from sea water containing dioxane by adding 0.4M Na2CO3 solution at 40°C. The presence of dioxane in moderate concentrations (3 to 8vol%) in a parent solution favors the formation of CaCO3 (calcite)-MgCO3 solid solution. Optimal condition for protodolomite synthesis was established. The mineral synthesized from sea water containing dioxane was very superior in size and crystallinity as compared to that from highly saline but dioxane-free solutions.

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Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium and barium ions.

Cited by 38 publications

References 29 publications

Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium ions in the presence of fluoride and phosphate ions.

Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium ions in the presence of fluoride and phosphate ions.

Precipitation of carbonates by Nesterenkonia halobia in liquid media

Synthesis of protodolomite from sea water containing dioxane.

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