The solubility of calcite in seawater solutions of various magnesium concentration, I t = 0.697 m at 25 °C and one atmosphere total pressure

Details The solubility of calcite in seawater solutions of various magnesium concentration, I t = 0.697 m at 25 °C and one atmosphere total pressure The solubility of calcite in seawater solutions of various magnesium concentration, I t = 0.697 m at 25 °C and one atmosphere total pressure

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..815m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 4, pp.815-822

Computer Science

12

Scientific paper

Stoichiometric solubility constants of calcite in initially supersaturated solutions of various magnesium to calcium concentration ratios but identical ionic strength were determined at 25°C and one atmosphere total pressure. The thermodynamic solubility constant of calcite is used with ion pairing equations to interpret the data reported in this study. Results indicate that even though magnesian calcites, rather than pure calcite, precipitate from seawater solutions containing magnesium ions, the incorporation of MgCO 3 in the calcite crystal lattice does not extensively alter the equilibrium calcium carbonate activity product. The equilibrium activity of the ionic species in solution and the composition of magnesian calcite overgrowths precipitated from solutions of similar composition are used to calculate the solubility of magnesian calcites. The values for magnesian calcite solubilities obtained by this approach are lower than those obtained from the dissolution kinetics of biogenic carbonates.

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