Determination of Free Nickel Ion Concentrations Using the Ion Exchange Technique: Application to Aqueous Mining and Municipal Effluents |
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| Authors: | Yamini Gopalapillai Ismail I Fasfous John D Murimboh Tahir Yapici Parthasarathi Chakraborty Chuni L Chakrabarti |
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| Institution: | (1) Ottawa-Carleton Chemistry Institute, Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada, K1S 5B6;(2) Department of Chemistry, The Hashemite University, P.O. Box 150459, Zarqa, 13115, Jordan;(3) Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS, Canada, B4P 2R6 |
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| Abstract: | Free metal ion concentration is generally considered a useful indicator of a metal’s bioavailability and ecotoxicity to aquatic
biota. This article reports the speciation of nickel in mining and municipal effluents from Sudbury (Ontario, Canada), and
also in model solutions containing a fully characterized laurentian fulvic acid (LFA) at environmentally relevant concentrations.
A column ion exchange technique (IET) using a cation exchange resin (Dowex 50W-X8) was applied to determine free nickel ion
concentrations. In model solutions, reasonable correlation was found between the predictions of an equilibrium-based computer
speciation code, Windermere Humic Aqueous Model (WHAM) VI, and the results obtained by IET at low nickel-to-fulvic acid ratios.
However at higher mole ratios, the WHAM VI predicted higher free nickel ion concentrations than IET. Only three out of six
effluent samples showed reasonable agreement between the IET and the WHAM VI results, indicating the need for further development
of IET for application to effluent waters. |
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| Keywords: | Ion exchange technique Nickel speciation Free metal ion WHAM VI Mine effluent Dissolved organic carbon Bioavailability |
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