Radiotracer analysis of the physico-chemical state of trace elements in aqueous solutions

Beneš, P.; Glos, J.

doi:10.1007/bf02517698

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…1. Calculation of the electrophoretic mobility includes a correction for sorption losses which assumes linear increase in Eu adsorption with time during the electrophoretic experiment [29], but perhaps the adsorption kinetics is much more rapid so that greater part of Eu than expected (and assessed from the amount of the metal desorbed after experiment) is not available for electromigration. …”

Section: Resultsmentioning

confidence: 99%

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Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Mizera¹,

Dolanský²,

Beneš³

2001

Radiochimica Acta

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Humic acid / Europium / Radiotracer method / Electrophoresis / ComplexationSummary. 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 Eu 3+ 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 × 10 −3 M of Eu total concentration at pH 3, 4, 5 and 6, and 0.01 M ionic strength (NaClO 4 ). In each batch, the degree of Eu complexation with HA was determined from 152 Eu 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 152 Eu anodic mobilities.

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Section: Resultsmentioning

confidence: 99%

“…The method of the free liquid/moving boundary electrophoresis and its instrumentation was described in detail elsewhere [29]. The electrophoretic cell is filled with an analyzed Eu/HA solution being identical in all three (anodic, central, and cathodic) cell compartments but for radiolabelling in the central compartment.…”

Section: Instrumentation and Proceduresmentioning

confidence: 99%

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Mizera¹,

Dolanský²,

Beneš³

2001

Radiochimica Acta

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“…See [22,23] for more details and explanations. The amounts of uranium were determined using ICP MS (for uranium concentrations lower than 10" 5 mol/1) or by spectrophotometry of the uranium arsenazo III complex at 653 nm.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…The apparatus and procedure for free-liquid electrophoresis used in this work were described in detail earlier [22,23]. The electrophoretic cell consisted of three parts made of plastic tubings connected with two three-way Teflon stopcocks.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Effect of Humic Acid on the Electrophoretic Mobility of Uranium (VI) in Aqueous Solutions

1999

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Electrophoresis of hexavalent uranium in aqueous solutions containing humic acid (HA) Gohy-573 was studied with the aim to characterize the uranium-humic acid (U-HA) complexes formed. Electrophoretic mobility of uranium towards cathode and anode was determined using a free-liquid electrophoresis, as a function of pH and concentration of humic acid and uranium. Experiments with solutions of 1 X 10~4 mol/1 uranium in absence of humic acid indicated hydrolysis of uranium at pH 3-5. Similar hydrolysis, probably accompanied by the formation of pseudocolloids, was also found for 1 X 10 6 mol/1 uranium. Addition of humic acid in 5.6 X 10~6, 3 X10 5 or 1 X 10 4 mol/1 concentration to 5 X 10" 7 -2 X 10 4 mol/1 solution of uranium at pH 4.0 caused decrease in uranium mobility towards cathode and increase in its mobility towards anode, due to the formation of neutral and/or negatively charged U-HA complexes. The changes were more pronounced at higher ratio [HA]/[U] concentrations. Abundances of U-HA complexes and their mean mobilities towards anode were calculated from the results obtained. It was found that the mobilities decrease with the increasing [U]/HA] ratio due to saturation of negative charge of the humic acid with positively charged uranium species, mainly UO! + .

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“…Some of the techniques ensure that disturbances of chemical equilibrium are avoided, kept at minimum or do not affect speciation analysis. Particularly suitable for this purpose are various spectroscopic methods (e.g., LIPAS, etc., see above), free-liquid electrophoresis [7,143], diffusion [144], and special methods of solvent extraction [145]. Relatively rapid physical separation methods like centrifugation, filtration and ultra-filtration [36,146] in small-volume arrangements do often not significantly disturb the equilibrium, either.…”

Section: Model Experiments For Aqueous Speciationmentioning

confidence: 99%

Speciation of Radionuclides in the Environment

Gunten

Beneš

1995

Radiochimica Acta

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Methods for the determination of the speciation of radionuclides in aerosols, in aquatic solutions, in sediments, soils and rocks are reviewed. At present, most of the results about speciation are deduced from model calculations, model experiments, and separation of species (forms) of radionuclides, e.g., by sequential extraction procedures. Methods of direct determination of speciation of radionuclides (e.g., by laser induced spectroscopy) are in general not yet sensitive enough for a measurement of the very low concentrations of radionuclides in the environment. The methodological part of this paper is followed by a review of the very abundant literature about speciation of important radionuclides in the environment, i.e., in the atmosphere, hydrosphere and lithosphère. The review does not include the biosphere. Literature up to spring 1993 is included (with a few more recent additions).

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Radiotracer analysis of the physico-chemical state of trace elements in aqueous solutions

Cited by 12 publications

References 11 publications

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Radiotracer study of the electrophoretic behavior of Eu and its complexes with humic acid

Effect of Humic Acid on the Electrophoretic Mobility of Uranium (VI) in Aqueous Solutions

Speciation of Radionuclides in the Environment

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