Interaction of copper with the surface of calcite

Franklin, M L; Morse, J W

Title: Interaction of copper with the surface of calcite

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Abstract

The interaction of Cu ions in solution with the surface of calcite has been studied in a range of solutions from pure water to seawater. Observations of the uptake of Cu from solution onto calcite indicates that the process is rapid and strong in both distilled water and seawater. In distilled water, Cu uptake is directly proportional to the concentration of Cu in solution; Cu/sub s/ = K/sub s/Cu/sub 1/. This Cu/sub s/ dependence on Cu/sub 1/ is linear over the entire Cu concentration range studied (0.1 to 200 ..mu..M). Results do not indicate the formation of a precipitate of either malachite or copper carbonate. In seawater, the uptake of Cu is also directly proportional to the concentration of Cu/sub 1/ up to a limiting value of approximately 13 ..mu..M. The average value for K/sub s/ in seawater, 0.24 +- 0.06 (Cu/sub 1/ less than or equal to 13 ..mu..M), is approximately an order of magnitude less than in distilled water. This is probably the result of smaller Cu/sub 1/ activity coefficients and increased site competition by other ions in seawater. Attempts to increase the Cu/sub 1/ concentration above 13 ..mu..M resulted in the additional Cu being deposited on themore »« less

Authors:: Franklin, M L; Morse, J W

Publication Date:: Fri May 01 00:00:00 EDT 1981

Research Org.:: Lawrence Berkeley Lab., CA (USA)

OSTI Identifier:: 5438497

Report Number(s):: LBL-12959
ON: DE84004402

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 14 SOLAR ENERGY; CALCITE; SORPTIVE PROPERTIES; COPPER IONS; ADSORPTION; COPPER; EXPERIMENTAL DATA; SEAWATER; WATER; ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CHARGED PARTICLES; DATA; ELEMENTS; HYDROGEN COMPOUNDS; INFORMATION; IONS; METALS; MINERALS; NUMERICAL DATA; OXYGEN COMPOUNDS; SORPTION; SURFACE PROPERTIES; TRANSITION ELEMENTS; 400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987); 140800 - Solar Energy- Ocean Energy Systems

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                    Franklin, M L, and Morse, J W. Interaction of copper with the surface of calcite.  United States: N. p., 1981. 
        Web.

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                    Franklin, M L, & Morse, J W. Interaction of copper with the surface of calcite.  United States.

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                    Franklin, M L, and Morse, J W. 1981.  
        "Interaction of copper with the surface of calcite".  United States.

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@article{osti_5438497,

  title        = {Interaction of copper with the surface of calcite},

  author       = {Franklin, M L and Morse, J W},

  abstractNote = {The interaction of Cu ions in solution with the surface of calcite has been studied in a range of solutions from pure water to seawater. Observations of the uptake of Cu from solution onto calcite indicates that the process is rapid and strong in both distilled water and seawater. In distilled water, Cu uptake is directly proportional to the concentration of Cu in solution; Cu/sub s/ = K/sub s/Cu/sub 1/. This Cu/sub s/ dependence on Cu/sub 1/ is linear over the entire Cu concentration range studied (0.1 to 200 ..mu..M). Results do not indicate the formation of a precipitate of either malachite or copper carbonate. In seawater, the uptake of Cu is also directly proportional to the concentration of Cu/sub 1/ up to a limiting value of approximately 13 ..mu..M. The average value for K/sub s/ in seawater, 0.24 +- 0.06 (Cu/sub 1/ less than or equal to 13 ..mu..M), is approximately an order of magnitude less than in distilled water. This is probably the result of smaller Cu/sub 1/ activity coefficients and increased site competition by other ions in seawater. Attempts to increase the Cu/sub 1/ concentration above 13 ..mu..M resulted in the additional Cu being deposited on the surface of the calcite. A possible explanation for this behavior is the formation of a precipitate of malachite on the calcite surface. The value of K/sub s/ decreased slightly with increasing solid to solution ratios in seawater.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5438497},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Fri May 01 00:00:00 EDT 1981},

  month        = {Fri May 01 00:00:00 EDT 1981}

}

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Interaction of copper with the surface of calcite

Technical Report Franklin, M.; Morse, J.

The interaction of Cu ions in solution with the surface of calcite has been studied in a range of solutions from pure water to seawater. Observations of the uptake of Cu from solution onto calcite indicates that the process is rapid and strong in both distilled water and seawater. In distilled water, Cu uptake is directly proportional to the concentration of Cu in solution; Cu/sub s/ = K/sub s/Cu/sub 1/. The average value for K/sub s/ is 3.5 +- 1.7. The Cu/sub s/ dependence on Cu/sub 1/ is linear over the entire Cu concentration range studied (0.1 to 200 ..mu..M).more »« less
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Novel procedures were developed to determine the composition of magnesian calcite overgrowths precipitated on calcite crystals from seawater solutions. A surface sensitive analytical technique, Scanning Auger Microanalysis (SAM), was used to determine the composition of very thin overgrowths (< 0.5 ..mu..m) which could not be analyzed by more conventional techniques. Thin magnesian calcite overgrowths were precipitated by exposing Iceland spar calcite crystals to slightly supersaturated (Omega similarly ordered 1.2) synthetic seawater solutions of various Mg to Ca ratios, at 25/sup 0/C, for various lengths of time. The SAM analysis of these thin overgrowths (30-300 A) reveals that their composition ismore »« less
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Direct measurement of the solubility of calcite in seawater is difficult and irreproducible because of kinetic factors that inhibit the attainment of true, reversible equilibrium. To avoid this problem, the solubility product constant for calcite in seawater was determined in the present study by calculation from new measurements of the aragonite solubility product constant in seawater and the differential solubility of calcite and aragonite in carbonated distilled water. All measured equilibria were reversed, and redundant measurement of pH, P/sub CO/sub 2/, calcium concentration, and carbonate alkalinity was used as a check on the results. The resultant calculated values of K'/submore »« less
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NMR surface relaxivity of calcite with adsorbed Mn{sup 2+}

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Calcite particles were exposed to Mn{sup 2+} in aqueous solution to allow adsorption. The calcite particles were then packed, and the NMR longitudinal relaxation time T{sub 1} of water saturating the interparticle pores was measured. NMR surface relaxivity was then computed as 1/(T{sub 1}{times}S{sub p}/V{sub p}), where S{sub p}/V{sub p} is the ratio of surface area to pore volume. Adsorbed manganese increases the NMR surface relaxivity to approximately 2.4 {times} 10{sup {minus}3} cm/s, roughly 50 times the surface relaxivity of very pure calcite. Flowing water with 4 {mu}M Mn{sup 2+} through a porous limestone plug decreased its T{sub 1} bymore »« less
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Radiaxial-fibrous calcites (RFC) in marine carbonates are generally considered syndepositional cements. In Upper Triassic and basal Liassic reef and platform limestones in Austria (Steinplatte complex), however, isopachous RFC is demonstrably a postdepositional diagenetic component that precipitated in shallow-burial phreatic environments during a time of periodic meteoric exposure. Isopachous RFC occurs solely within solution cavities and is interlayered with internal red sediment; discontinuities due to leaching separate sequential generations of RFC in the rocks. Accordingly, one possibility is that the RFC was originally low-magnesium calcite that precipitated in the meteoric phreatic zone during lowstands. Such calcites contain relatively low magnesium concentrationsmore »« less

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