Kinetic speciation of nickel in mining and municipal effluents
- 122 Downloads
This study presents the results of kinetic speciation of nickel in undiluted mining and municipal effluents and effluents diluted with receiving freshwaters from the surrounding environment. The dilution ratios used for the dilution of the effluents were arbitrarily chosen, but were representative of the prevailing mining practices. The purpose of the this dilution was to mimic dilution with natural waters that result from dilution of the mining and municipal effluents with receiving freshwaters, so that this study would reveal environmental realities that are of concern to the managers and regulators of water resources.
Ligand exchange kinetics using the competing ligand exchange method (CLEM) was studied using two independent techniques: graphite furnace atomic absorption spectrometry (GFAAS) with Chelex 100 resin as the competing ligand, and adsorptive cathodic stripping voltammetry (AdCSV) with dimethylglyoxime (DMG) as the competing ligand to determine the percentage of Ni metal released from Ni(II)–DOC complexes and the rate of dissociation of Ni(II)–DOC complexes. Using a sample containing a mixture of 30% Copper Cliff Mine effluent, 40% Sudbury municipal effluent and 30% Vermillion River water, both techniques gave results showing that the dilution of the effluent samples increased the percentage of nickel released from Ni(II)–DOC complexes. This increase in the release of nickel from the Ni(II)–DOC complexes may be of concern to managers and regulators of water resources. Agreement between the results of these two techniques has enhanced the validity of the competing ligand exchange method used by both techniques.
KeywordsNickel speciation Mine effluent Competing ligand exchange method Release of nickel Dissolved Organic Carbon Adsorptive Cathodic Stripping Voltammetry Graphite Furnace Atomic Absorption Spectrometry
The financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada and the NSERC Metals in the Human Environment - Research Network are gratefully acknowledged.
- 1.Morel FMM, Hering JG (1993) Principles of aquatic chemistry. Wiley, New York, USA, p 360Google Scholar
- 3.Langsto WJ, Bryan GW (1984) In: Kramer CJM, Duinker JC (eds) Complexation of trace metals in natural waters. Martinus Nijhoff/Dr. W. Junk Publishers, The Hague, The Netherlands, p 375Google Scholar
- 5.Morel FMM, Hering JG (1993) Principles of aquatic chemistry. Wiley, New York, USA, p 377Google Scholar
- 7.Morel FMM, Hering JG (1993) Principles of aquatic chemistry. Wiley, New York, USA, p 362Google Scholar
- 13.Olson DL, Shuman MS (1983) Anal Chem 55:1103–1107Google Scholar
- 22.Sedykh EM, Starshinova NP, Bannykh LN, Yu EE, Venitsianov EV (2000) Zh Anal Khim 55:344–349Google Scholar
- 24.Wang J (1994) Analytical electrochemistry. VCH, New York, p 32Google Scholar
- 27.Mandal R. Ph.D Thesis, Carleton University, Ottawa, Canada 2001Google Scholar
- 28.Campbell PGC (1995) Metal speciation and bioavailability in aquatic systems. Wiley, New York, p 45Google Scholar
- 32.Morel FMM (1993) Principles of aquatic chemistry. Wiley, New York, p 388Google Scholar
- 34.Sekaly ALR (2001) PhD Thesis, Carleton University, Ottawa, CanadaGoogle Scholar
- 44.Bryan SE, Tipping E, Hamilton-Taylor J (2002) Comp Biochem Physiol C 133:37–49Google Scholar