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

Magnesian calcites were precipitated from 10 mM Ca(HCO3)2 (Ca2+, 400 mg/l) solutions containing 35 or 53.5 mM Mg ions (Mg2+, 850 or 1300 mg/l) in the presence of fluoride and phosphate ions in various concentrations. Magnesian calcite formation from aqueous solution was favored by the presence of fl...

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Published inGEOCHEMICAL JOURNAL Vol. 22; no. 6; pp. 275 - 283
Main Authors Oomori, Tamotsu, Kyan, Atsuko, Kitano, Yasushi
Format Journal Article
LanguageEnglish
Published Tokyo GEOCHEMICAL SOCIETY OF JAPAN 1988
Geochemical Society of Japan
Subjects
Earth sciences
Earth, ocean, space
Exact sciences and technology
Petrology of sedimentary rocks except quaternary rocks
Sedimentary rocks
Phosphates
Synthesis
Adsorption
Aqueous solutions
Fluorine
Marine sedimentation
Genesis
Ions
Carbonates
Magnesium
Calcite
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Summary:Magnesian calcites were precipitated from 10 mM Ca(HCO3)2 (Ca2+, 400 mg/l) solutions containing 35 or 53.5 mM Mg ions (Mg2+, 850 or 1300 mg/l) 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.
ISSN:0016-7002
1880-5973
DOI:10.2343/geochemj.22.275