Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid
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J. Mizera
The interaction of Eu with purified/protonized Aldrich humic acid (HA) was studied by the free liquid/moving boundary electrophoresis used in combination with the radiotracer method. Introductory experiments were carried out to test electrophoretic behavior of Eu in HA-free solutions, and to determine mobility of Eu3+ cation. To get the data for evaluation of parameters describing Eu binding to HA, titrations of HA (10 mg/L) with Eu were performed batchwise in the range 3.4×10-8-1.7-3 M of Eu total concentration at pH 3, 4, 5 and 6, and 0.01 M ionic strength (NaClO4). In each batch, the degree of Eu complexation with HA was determined from 152Eu electrophoretic mobilities in the cathodic direction. The experimental data were fitted with a discrete site model (Scatchard plot-like model) with two types of carboxylic sites. An additional information on the charge characteristics of the Eu-HA complexes has been obtained from the 152Eu anodic mobilities.
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Articles in the same Issue
- Determination of cumulative yields of fission products from 238U by 5.0 MeV neutrons
- Plutonium(IV) peroxide formation in nitric medium and kinetics Pu(VI) reduction by hydrogen peroxide
- Thermodynamics of the PuO2+-Na+-OH--Cl--ClO4--H2O system: use of NpO2+ Pitzer parameters for PuO2+
- Interaction of aerobic soil bacteria with plutonium(VI)
- Complexation behaviour of neptunium with humic acid
- Uranyl(VI) carbonate complex formation: Validation of the Ca2UO2(CO3)3(aq.) species
- The migration of radionuclides 237Np, 238Pu and 241Am in a weak loess aquifer: A field column experiment
- Technetium(VII) transport across supported liquid membranes (SLMs) containing 2-nitrophenyl octyl ether (NPOE)
- Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid
- Electroosmotic effects in the determination of ion mobilities of carrier-free radionuclides in free aqueous electrolyte solutions
