Water, Air, and Soil Pollution

, Volume 193, Issue 1–4, pp 131–146 | Cite as

Kinetic Speciation of Ni(II) in Model Solutions and Freshwaters: Competition of Al(III) and Fe(III)

  • Nouri Hassan
  • John D. Murimboh
  • Chuni L. Chakrabarti


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.


Competition Kinetics Nickel Iron Aluminium Freshwaters 



The authors are grateful to the Nickel Producers Environmental Research Association, USA, Inco Ltd., and Falconbridge Ltd., Canada, for three research contracts, and to the Natural Sciences and Engineering Research Council of Canada, for a research grant, the Metals in the Environment-Research Network, Ontario Power Generation Inc., and the Mining Association of Canada for a research grant. N.M. Hassan is grateful to the Government of Libya for a postgraduate scholarship.


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Nouri Hassan
    • 1
    • 2
  • John D. Murimboh
    • 3
  • Chuni L. Chakrabarti
    • 1
  1. 1.Department of ChemistryCarleton UniversityOttawaCanada
  2. 2.Worsfold Water Quality CentreTrent UniversityPeterboroughCanada
  3. 3.Department of ChemistryAcadia UniversityWolfvilleCanada

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