Abstract
Kinetic speciation of nickel, aluminium, and iron in fresh water has been investigated by cascade ultrafiltration followed by competing ligand exchange of the ultrafiltered fractions. Graphite furnace atomic absorption spectrometry was used to measure the kinetics of metal complex dissociation. Dissolved metal species were fractionated by cascade ultrafiltration. Metal speciation in each ultrafiltered fraction was then characterized as free metal ions, “labile” metal complexes (with dissociation rate constants ≥10−3 s−1), “slowly labile” metal complexes (with dissociation rate constants >10−6 s−1), and “inert” metal complexes (with dissociation rate constants <10−6 s−1). The experimental results were compared with the predictions of a computer-based equilibrium speciation model, the Windermere humic aqueous model (WHAM) V. Cascade ultrafiltration coupled with kinetic speciation of the metal species in each molecular weight cut-off (MWCO) fraction provided a more comprehensive picture and insight into the physical and the chemical characteristics of the metal species than either ultrafiltration or measurement of dissociation kinetics alone.
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Acknowledgements
The authors are grateful to the Nickel Producers Environmental Research Association, USA, Inco Ltd. and Falconbridge Ltd., Canada, for three research contracts, to the Natural Sciences and Engineering Research Council of Canada (NSERC), for a research grant, the Metals in the Environment-Research Network Grant, Ontario Power Generation Inc., and the Mining Association of Canada. N.M. Hassan is grateful to the Government of Libya for a postgraduate scholarship.
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Hassan, N.M., Murimboh, J.D., Sekaly, A.L.R. et al. Cascade ultrafiltration and competing ligand exchange for kinetic speciation of aluminium, iron, and nickel in fresh water. Anal Bioanal Chem 384, 1558–1566 (2006). https://doi.org/10.1007/s00216-006-0361-1
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DOI: https://doi.org/10.1007/s00216-006-0361-1