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Pb (II) Sorption with Calcite: A Radiotracer Study

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Abstract

A 210Pb radiotracer was used to monitor Pb solid-aqueousphase partitioning in sorption experiments at ambient temperature, pH = 8.2, and atmospheric PCO2 in 0.15 M NaNO3 solutions. A 24 h isotherm is linear up to Pb concentrations of 4 × 10-6 M, above which an increase in slope suggests precipitation. The effect of Pb concentration, calcite loading, and ionic strength on Pb sorption with time was monitored. Sorption kinetics are rapid, followed by a slower sorption step.At a constant calcite loading500 mg L-1,fractional sorptiondecreases with increasing initialPb concentration. The reverse isobserved for surface coverage, with0.6, 5.6 and 40.2% of availableCa2+sites occupied at10-8,10-7 and10-6 MPb after 96 h. At a constant Pb concentration of10-6 M,fractional sorption increases with increasing particleloading, however surface coverage decrease with72.5 and 22.1%Ca2+sites occupied at 100 and200 mg L-1calcite after 96 h.The adsorption coefficient (Kd) is approximately 103,increases with initial Pb concentration, but remains unaffected by variable calcite loading. Absence of an ionic strength effect on Pb sorption is interpreted as the dominance of inner-sphere complexation. For desorption experiments conducted over a range of initial sorption times, an average desorption index > 0.8 but < 1 indicates that sorption is largely reversible, but is accompanied by slight incorporation. Solid-solution formation increases with time, as observed by slower initial desorption rates for samples with longer sorption times. These findings indicate that Pb may be effectively sequestered by calcite; however re-release via desorption is likely as Pb does not become significantly incorporated into the mineral structure.

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Authors and Affiliations

  1. Department of Geosciences, Marine Sciences Research Center, State University of New York, Stony Brook, NY, 11794, USA

    ASHAKI A. Rouff & RICHARD J. Reeder

  2. Center for Environmental Molecular Science, Marine Sciences Research Center, State University of New York, Stony Brook, NY, 11794, USA

    NICHOLAS S. Fisher

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  1. ASHAKI A. Rouff
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Rouff, A.A., Reeder, R.J. & Fisher, N.S. Pb (II) Sorption with Calcite: A Radiotracer Study. Aquatic Geochemistry 8, 203–228 (2002). https://doi.org/10.1023/B:AQUA.0000003729.05602.de

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