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Abstract

 

This article in SSSAJ

  1. Vol. 43 No. 4, p. 693-698
     
    Received: Dec 14, 1978
    Accepted: Mar 5, 1979


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doi:10.2136/sssaj1979.03615995004300040013x

Chemisorption and Precipitation of Mn2+ at CaCO3 Surfaces1

  1. M. B. McBride2

Abstract

Abstract

The adsorption of Mn2+ 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 Mn2+ on CaCO3 surfaces lowered the solubility of Mn2+ below the level expected for MnCO3 precipitation. At high levels of Mn2+ in solution, after saturation of surface sites, nucleation at CaCO3 surfaces seemed to occur, followed by slow precipitation of separate phase MnCO3. The preference of calcite for Mn2+ relative to Ca2+ decreased with increasing Mn2+ absorption. The results indicate the importance of the surface area of the solid phase in determining the quantity of Mn2+ adsorbed and the final solution concentration.

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