Binding of cadmium to soil humic acid as a function of carboxyl group content

Authors

  • Tatjana Anđelković Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš
  • Ružica Nikolić Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš
  • Aleksandar Bojić Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš
  • Darko Anđelković Water Works Association „Naissus“, Kneginje Ljubice 1/I, 18000 Niš
  • Goran Nikolić Faculty of Technology, Bulevar oslobođenja 124, University of Niš, 16000 Leskovac

DOI:

https://doi.org/10.20450/mjcce.2010.168

Keywords:

cadmium, humic acid, carboxyl group content, Scatchard plot, ion-selective electrode

Abstract

The binding of Cd(II) to soil humic acid (HA) at pH 6.5 and in 0.1 mol/L KNO3 ionic medium, was studied by potentiometric titration with a cadmium ion selective electrode. The influence of carboxyl groups in cation-humic interactions was investigated by selective blocking of humic acid carboxyl groups with thionyl chloride and methanol. Infrared spectroscopic analysis confirmed that esterification took place. Differences between underivatized and derivatized HA complexation properties are ascribed to carboxyl groups. The Scatchard plots and incremental formation constants were used to obtain values for Cd-binding constants, for both HAs. The derivatization decreased the number of HA complexing sites by approximately 60 %, which correlates with acid-base properties of both HAs, studied by barium hydroxide and calcium acetate exchange methods. The stability constants for binding at the strongest sites (logKINT) was larger for underivatized HA (5.40) than for derivatized HA (4.92), indicating greater stability in the case when carboxyl groups are involved in complexation reaction.

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Published

2010-12-15

How to Cite

Anđelković, T., Nikolić, R., Bojić, A., Anđelković, D., & Nikolić, G. (2010). Binding of cadmium to soil humic acid as a function of carboxyl group content. Macedonian Journal of Chemistry and Chemical Engineering, 29(2), 215–224. https://doi.org/10.20450/mjcce.2010.168

Issue

Vol. 29 No. 2 (2010)

Section

Environmental Chemistry

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