Authors:
K. Štamberg Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Prague 1 Czech Republic

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P. Beneš Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Prague 1 Czech Republic

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J. Mizera Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Prague 1 Czech Republic

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J. Dolanský Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Praha 1 Czech Republic

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D. Vopálka Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Prague 1 Czech Republic

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K. Chalupská Czech Technical University, Faculty of Nuclear Science and Physical Engineering Department of Nuclear Chemistry Břehová 7 115 19 Praha 1 Czech Republic

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Abstract  

A general model, the so called Mean Molecular Weight Model (MMWM), of complexation of metal cations (Mez+) with macromolecular polyanions of humic acid (HAp-) is proposed. The model is based on the results of previous studies of the electrophoretic mobility of humate complexes and assumes that the complexation proceeds by consecutive neutralization of the dissociated carboxyl groups of the central polyanion HAp- with Mez+ cations. It reflects the macromolecular character of humic acid, applies molar concentrations of reacting components with equations for stability constants and incorporates also the mean charge of humic macromolecules. The model has been verified with experimental data obtained in the study of complexation of Eu(III) with Aldrich humic acid using ion exchange (Amberlite IR-120), over a broad range of [Eu] to [HA] ratio, at pH 4 and 7.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)