Separation of Oxydation States of Neptunium and Plutonium by Continuous Electrophoretic Ion Focusing

Mang, Marita; Gehmecker, H.; Trautmann, Ν.; Herrmann, G.

doi:10.1524/ract.1993.62.12.49

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…8 is much larger than that of histidine and proline. The similar phenomenon has been observed in the separation of radioactive metal ions of Pu(III) and Pu(IV) by a preparative FFE apparatus [28]. This may be caused due to the following reasons.…”

Section: Separation Of Amino Acidssupporting

confidence: 75%

A simple preparative free‐flow electrophoresis joined with gratis gravity: I. Gas cushion injector and self‐balance collector instead of multiple channel pump

et al. 2009

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This paper describes a novel free-flow electrophoresis (FFE), which is joined with gratis gravity, gas cushion injector (GCI) and self-balance collector instead of multiple channel pump, for the purpose of preparative purification. The FFE was evaluated by systemic experiments. The results manifest that (i) even though one-channel peristaltic pump is used for the driving of background buffer, there is still stable flow in the FFE chamber; (ii) the stable flow is induced by the gravity-induced pressure due to the difference of buffer surfaces in the GCI and self-balance collector; (iii) the pulse flow of background buffer induced by the peristaltic pump is greatly reduced by the GCI with good compressibility of included air; (iv) the FFE can be well used for zone electrophoretic separation of amino acids; (v) up to 20 inlets simultaneous sample injection and up to five to tenfold condensation of amino acid can be achieved by combining the FFE device with the method of moving reaction boundary. To the best of authors' knowledge, FFE has not been used for such separation and condensation of amino acids. The relevant results achieved in the paper have evident significance for the development of preparative FFE.

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Section: Separation Of Amino Acidssupporting

confidence: 75%

A simple preparative free‐flow electrophoresis joined with gratis gravity: I. Gas cushion injector and self‐balance collector instead of multiple channel pump

et al. 2009

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“…For the separation of metal húmate complexes from free metal cations electrophoretic ion focusing [15,16] and cation exchange chromatography were applied. Two different cation exchangers were used, the weakly acidic BioRex 70 and the strongly acidic Biorad AG50 resins, in order to confirm and explore further the recent observation [17] with europium(III), that the presence of strong and weak complex binding sites in the húmate molecule becomes evident when a strongly acidic cation exchange resin interacts with the europium húmate complex.…”

Section: -12]mentioning

confidence: 99%

“…The experimental set-up is described in [16], and the general procedures in [15]. The solution to be analyzed was fed into the narrow, central region of the separation chamber, which is attached to broader regions of electrolyte solutions on both the cathodic and anodic side.…”

Section: Electrophoretic Ion Focusingmentioning

confidence: 99%

Complexation of Samarium(III) and Americium(III) with Humic Acid at Very Low Metal Concentrations

1997

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The complexation of samarium(III) with humic acid was studied at concentrations between 10 5 M and 10~'° M by the separation of complexed from uncomplexed species with electrophoretic ion focusing or cation exchange chromatography, followed by the radiometric determination of the element in both fractions. The influence of humic acid concentration, pH-value, metal concentration and competing cations was investigated. Formation of a 1:1 complex between Sm(III) and húmate is observed with a pH-independent complexation constant log β = 7.1 ±0.2 derived from electrophoretic data. With cation exchange separations lower log β values are found, 4.8 ±0.2 with weakly and 4.2 ± 0.2 with strongly acidic resins, indicating a competition between samarium binding to the ion exchanger and to weak and strong binding sites in the húmate. A slowly established equilibrium is observed between samarium húmate binding modes of different strength. Variation of the samarium concentration from 10 6 to 10"'° M has only a slight influence on the stability constant, and magnesium interferes only above 10" 4 M concentrations.For the complexation of americium(III) with humic acid at 10"" M metal concentration log β = 6.6 ±0.2 is obtained from electrophoretic separations, and 4.7 ± 0.2 with weakly, 4.2 ± 0.2 with strongly acidic resins. This is, within the errors, in agreement with the samarium data.

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“…The experimental set-up was adapted from Mang et al [9]. The electrophoretic Chamber consisted of two parallel plates (27.5 X 20.5 cm) fixed at a distance of 0.5 mm.…”

Section: Continuous Electrophoretic Ion Focusingmentioning

confidence: 99%

“…Separations can be performed in two different approaches conceming the electrolyte and pH value in the Chamber [9]. In a three-zone system run at constant pH value the sample Solution, about 200 ml, was fed to the central section of the Chamber as a broad zone which on the cationic and the anionic side touches zones of buffer solutions.…”

Section: Continuous Electrophoretic Ion Focusingmentioning

confidence: 99%

Complexation of Neptunium(V) with Humic Acids at Very Low Metal Concentrations

1996

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Neptunium / Humic acid / Complexation / Continuous ion focusing / Anion exchange AbstractThe complexation of Np(V) with humic acids at metal concentrations between 10"" and 10"" M was investigated by continuous electrophoretic ion focusing and anion exchange chromatography combined with radiometric detection. The influence of neptunium and humic acid concentrations, pH value, ionic strength, temperature and competing cations on the complexation was studied. Formation of a 1:1 complex between Np(V) and humate is observed. After correction of the pH-dependent ionization of humic acid, a pH-independent complex stability constant log ß = 4.2±0.15 is obtained in 10"" M Np(V) Solution for the Aldrich and values between 3.6 and 4.4 for the Gorleben humic acid. The stability constant changes by a factor of 2.5 when the neptunium concentration is varied between 10"'^ and 10"" M. No effect of ionic strength between 0.001 and 0.1 M is found. With increasing temperature the Nphumate complexation decreases. Calcium and magnesium act as competitive cations at concentrations higher than 10"" M. Under anaerobic conditions and at very low metal concentrations, humic acid reduces Np(V) to Np(IV) at a pH-depending rate.

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Separation of Oxydation States of Neptunium and Plutonium by Continuous Electrophoretic Ion Focusing

Cited by 5 publications

References 11 publications

A simple preparative free‐flow electrophoresis joined with gratis gravity: I. Gas cushion injector and self‐balance collector instead of multiple channel pump

A simple preparative free‐flow electrophoresis joined with gratis gravity: I. Gas cushion injector and self‐balance collector instead of multiple channel pump

Complexation of Samarium(III) and Americium(III) with Humic Acid at Very Low Metal Concentrations

Complexation of Neptunium(V) with Humic Acids at Very Low Metal Concentrations

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