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Isotope exchange study of the dissociation of metal —humic substance complexes

  • Session 1: Radionuclides in the Environment, Radioecology
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Czechoslovak Journal of Physics Aims and scope

Abstract

Isotope exchange was employed to study dissociation of metal cations from their complexes with humic substances (HS). Dissociation of cation from HS controls the rate of isotope exchange between two identical metal-HS solutions (but for the presence of a radiotracer) divided by a dialysis membrane. The rate of isotope exchange of Eu/152Eu and Co/60Co in the systems with various HS was monitored as a function of pH, ionic strength, and the degree of HS loading with metal. The apparent rate of Eu-HS dissociation was found to be enhanced by decreasing pH, increasing ionic strength, and increasing metal loading. Co-HS dissociation was too fast to be followed by the method. For interpretation of the experimental kinetic data, the multiple first order law has been applied. Based on the results, a concept of HS as a mixture of two types of binding sites is discussed.

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Authors and Affiliations

  1. Department of Nuclear Chemistry, Czech Technical University in Prague, Břehová 7, 115 19, Praha 1, Czech Republic

    J. Mizera, A. Jansová, I. Hvoždová & P. Beneš

  2. Institute of Soil Biology, Academy of Sciences of the Czech Republic, Na sadkách 7, 370 05, České Budějovice, Czech Republic

    F. Novák

Authors
  1. J. Mizera
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  2. A. Jansová
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  3. I. Hvoždová
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  4. P. Beneš
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  5. F. Novák
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Additional information

The study has been supported by the grant MSM J04/98:210000019.

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Mizera, J., Jansová, A., Hvoždová, I. et al. Isotope exchange study of the dissociation of metal —humic substance complexes. Czech J Phys 53 (Suppl 1), A97–A101 (2003). https://doi.org/10.1007/s10582-003-0015-x

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  • DOI: https://doi.org/10.1007/s10582-003-0015-x

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