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Free cupric ion concentrations and Cu complexation in selected Swiss lakes and rivers

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Abstract

[Cu2+] and Cu complexation parameters in some selected freshwater systems in Switzerland were determined by the technique of ligand-exchange and DPCSV. Results from the water columns of some eutrophic and oligotrophic lakes are presented and compared to small acid lakes. Cu is strongly complexed by organic ligands which with very high stability constants at low concentrations are probably biologically produced, as indicated by the seasonal variations in the eutrophic lakes and by the relationship between Cu complexation and algal activity in the eutrophic (pCu=15−16), oligotrophic (pCu=13−14) and acidic (pCu=9−10) lakes. The extent of Cu complexation in river waters was generally lower than in the eutrophic lakes, at similar DOC levels. No obvious correlation between Cu complexation and DOC was observed, indicating that Cu complexing ligands are specific organic compounds.

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Authors and Affiliations

  1. Research Centre for Limnology, Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-6047, Kastanienbaum, Switzerland

    Hanbin Xue

  2. Research Centre for Limnology, Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland

    Andrea Oestreich, David Kistler & Laura Sigg

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  1. Hanbin Xue
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  2. Andrea Oestreich
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  3. David Kistler
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  4. Laura Sigg
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Xue, H., Oestreich, A., Kistler, D. et al. Free cupric ion concentrations and Cu complexation in selected Swiss lakes and rivers. Aquatic Science 58, 69–87 (1996). https://doi.org/10.1007/BF00877641

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  • DOI: https://doi.org/10.1007/BF00877641

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