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Chemisorption and Precipitation of Mn2+ at CaCO3 Surfaces
Author(s) -
McBride M. B.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300040013x
Subject(s) - calcite , chemisorption , adsorption , precipitation , solubility , nucleation , saturation (graph theory) , mineral , chemistry , absorption (acoustics) , manganese , phase (matter) , analytical chemistry (journal) , inorganic chemistry , mineralogy , materials science , environmental chemistry , meteorology , physics , mathematics , organic chemistry , combinatorics , composite material
The adsorption of Mn 2+ on two samples of powdered calcite with different surface areas has been studied using atomic absorption and electron spin resonance spectroscopy to investigate the solution and mineral phases. Chemisorption of Mn 2+ on CaCO 3 surfaces lowered the solubility of Mn 2+ below the level expected for MnCO 3 precipitation. At high levels of Mn 2+ in solution, after saturation of surface sites, nucleation at CaCO 3 surfaces seemed to occur, followed by slow precipitation of separate phase MnCO 3 . The preference of calcite for Mn 2+ relative to Ca 2+ decreased with increasing Mn 2+ absorption. The results indicate the importance of the surface area of the solid phase in determining the quantity of Mn 2+ adsorbed and the final solution concentration.