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Calcium binding to an aquatic fulvic acid

  • Session 3: Complex Formation And Interactions With Solids
  • Conference paper
  • First Online:
Humic Substances in the Aquatic and Terrestrial Environment

Part of the book series: Lecture Notes in Earth Sciences ((LNEARTH,volume 33))

Abstract

The degree of binding of calcium to aquatic fulvic acid from the Göta River was estimated from potentiometric titrations. A pH-glass electrode and a calcium-selective electrode were used to monitor the free concentrations of the competing, central ions. The ionic strength and the temperature were maintained constant at 0.1 M and 25°C. The total concentration of fulvic acid was maintained at approximately 1 g 1−1, while the total calcium concentration was varied within the range 0–10−3 M. Two types of titrations were carried out: (1) back titration with hydrochloric acid from basic solution, roughly within the pH range 10.5–2.5; (2) titration with calcium chloride at a constant total hydrogen ion concentration. The model applied for the calcium binding was an extension of our previous model for the acid-base behaviour.

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References

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Authors and Affiliations

  1. Department of Analytical and Marine Chemistry, University of Göteborg and Chalmers University of Technology, S-412 96, Göteborg, Sweden

    Nicklas Paxéus & Margareta Wedborg

Authors
  1. Nicklas Paxéus
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  2. Margareta Wedborg
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Editor information

Bert Allard Hans Borén Anders Grimvall

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© 1991 Springer-Verlag

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Paxéus, N., Wedborg, M. (1991). Calcium binding to an aquatic fulvic acid. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010480

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  • DOI: https://doi.org/10.1007/BFb0010480

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-53702-1

  • Online ISBN: 978-3-540-46985-8

  • eBook Packages: Springer Book Archive

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