Interaction of manganese(II) with the surface of calcite in dilute solutions and seawater

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The interaction of Mn/sup 2 +/ with the surface of calcite in aqueous solutions is complex. In dilute solutions the Mn/sup 2 +/ is rapidly adsorbed, MnCO/sub 3/ nucleates on the calcite surface and then grows by a first order reaction with respect to the initial Mn/sup 2 +/ concentration. At higher ionic strengths, in NaCl solutions, the rate of these processes is slower, but the same general pattern persists. In solutions containing Mg/sup 2 +/, at the concentration of seawater and in seawater, the nucleation phase of the uptake process does not appear to occur. The long term uptake … continued below

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29 pages

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Franklin, M. L. & Morse, J. W. July 1, 1981.

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The interaction of Mn/sup 2 +/ with the surface of calcite in aqueous solutions is complex. In dilute solutions the Mn/sup 2 +/ is rapidly adsorbed, MnCO/sub 3/ nucleates on the calcite surface and then grows by a first order reaction with respect to the initial Mn/sup 2 +/ concentration. At higher ionic strengths, in NaCl solutions, the rate of these processes is slower, but the same general pattern persists. In solutions containing Mg/sup 2 +/, at the concentration of seawater and in seawater, the nucleation phase of the uptake process does not appear to occur. The long term uptake rate of Mn/sup 2 +/ on the surface of calcite in seawater is first order with respect to the disolved Mn/sup 2 +/ concentration. The rate constant is over 3 orders of magnitude smaller than that found in dilute Mg/sup 2 +/-free solutions. A probable explanation for the slower growith rate in seawater is that MnCO/sub 3/ is not nucleated on the calcite surface due to the presence of high Mg/sup 2 +/ concentrations. These, through site competition, prevent enough Mn/sup 2 +/ from being adsorbed to reach a critical concentration for MnCO/sub 3/ nucleation. This behavior is similar to that found for orthophosphate with calcite surfaces in dilute solutions and seawater. Measurements of the solubility of rhodochrosite in seawater gave results from an undersaturation approach to equilibrium in excellent agreement with those found in previous studies in dilute solutions. When equilibrium was approached from supersaturation, approximately 50 times more calcium was precipitated than Mn/sup 2 +/. The measured solubility was over twice that determined from undersaturation. It is possible that a Mn-calcite containing 25 to 30 mole percent MnCO/sub 3/ formed on the rhodochrosite from the supersaturated solutions. Consequently, it is doubtful that rhodochrosite controls the concentration of Mn/sup 2 +/ in calcium carbonate rich marine environments.

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29 pages

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NTIS, PC A03/MF A01.

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  • July 1, 1981

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  • Feb. 10, 2018, 10:06 p.m.

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  • Jan. 28, 2021, 11:59 a.m.

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Franklin, M. L. & Morse, J. W. Interaction of manganese(II) with the surface of calcite in dilute solutions and seawater, report, July 1, 1981; California. (https://digital.library.unt.edu/ark:/67531/metadc1091256/: accessed June 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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