Kinetic Speciation of Ni(II) in Model Solutions and Freshwaters: Competition of Al(III) and Fe(III) |
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Authors: | Nouri Hassan John D. Murimboh Chuni L. Chakrabarti |
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Affiliation: | 1. Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, KIS 5B6, Canada 2. Worsfold Water Quality Centre, Trent University, Peterborough, Ontario, K9J 7B8, Canada 3. Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, Nova Scotia, B4P 2R6, Canada
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Abstract: | The competing ligand exchange method was used to investigate the competitive binding of Ni(II) by Al(III) and Fe(III) in model aqueous solutions and freshwaters. Graphite furnace atomic absorption spectrometry and adsorptive cathodic stripping voltammetry were used to monitor the rate of uptake of the Ni by Chelex 100 chelating resin and dimethylglyoxime as the competing ligands, respectively. The results have revealed that Ni(II)–humate complexes were more labile in presence of the mixture of Al(III) and Fe(III), compared to the lability of the Ni(II)–humate complexes when only one of the two, Al(III) or Fe(III), was present. The environmental significance of this work is that in model solutions simulating freshwater containing humic substances and the target trace metal Ni(II) and cations, Al(III) and Fe(III), the competitive binding of Ni(II), Al(III) and Fe(III) by humic substances makes Ni(II)–humate complexes labile, releasing free Ni2+–aqua complex, which reported to be toxic. |
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