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Chemisorption and Precipitation of Mn²⁺ at CaCO₃ Surfaces¹

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.

¹ Contribution of the Dept. of Agronomy, Cornell Univ., Ithaca, NY. 14853. Agronomy Paper No. 1304.

² Assistant Professor of Agronomy.

Received for publication December 14, 1978. Accepted for publication March 5, 1979.

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