Adsorption of copper and cobalt from fresh and marine systems |
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Authors: | Thomas P OConnor Dana R Kester |
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Institution: | Graduate School of Oceanography, University of Rhode Island, Kingston, RI 02881, U.S.A. |
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Abstract: | The adsorption of copper and cobalt from aqueous solution on to illite and other substrates has been studied as a function of pH, solution composition and solid phase concentration. The results are interpreted in terms of a model whereby the trace metals are adsorbed in exchange for surface bound H+ ions. Adsorption varies with solution ionic strength and the concentrations of complex forming ligands; both of these parameters tend to reduce the trace metal adsorption. The Cu2+ is two orders of magnitude more reactive toward solid surfaces than Co2+ , which is consistent with the general reactivities of these two metal ions. It is also found that Mg2+ interferes with adsorption, presumably by competing with the trace metals for the surface sites. A quantitative model was developed which describes adsorption of these metals from natural waters ranging from river water to sea water as a function of pH, complexing ligands and magnesium activity. |
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