Isotachophoretic separation of rare earth ions I. Separation behaviour of yttrium and fourteen lanthanide ions forming complexes with tartaric acid and α-hydroxyisobutyric acid

Hirokawa, Takatsugu; Xia, Wen; Kiso, Yoshiyuki

doi:10.1016/0021-9673(94)00872-7

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…Several papers exist for ITP, demonstrating an ability to analyze real samples, such as REEs ores [46], concentrates, phosphors or ceria-based polishing powders [97]. An interesting application of ITP was presented by Mao et al [40], who analyzed a historical REEs concentrate stored for many years at the Charles University in Prague under the name "didym".…”

Section: Applicationsmentioning

confidence: 99%

“…As mentioned in the previous chapter, HIBA is the most common complexing agent in separations of lanthanides; it is frequently used both in the ITP as well as in CZE modes. Usually, additional complexing agent is used to improve the separation (e.g., malonic acid [40], tartronic acid and glycolic acid [39], or tartaric acid [46]), or to facilitate the detection (pyridine-2-carboxylic acid [47]). However, HIBA is used most commonly in combination with acetic acid, as suggested in the pioneer's work of Foret et al [35].…”

Section: Separation Modes and Strategiesmentioning

confidence: 99%

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Analytical separations of lanthanides and actinides by capillary electrophoresis

Janoš

2003

Electrophoresis

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The separation of lanthanide and actinide elements belongs to one of the most challenging tasks of the separation science, due to a great similarity in their physical and chemical properties. The electrophoretic separation can be accomplished in the presence of suitable complex-forming agents, from which alpha-hydroxyisobutyric acid (HIBA) has been used most often. In the most effective capillary electrophoretic mode--capillary zone electrophoresis (CZE)--a complete separation of lanthanide ions can be accomplished within a few minutes. Various electrophoretic methods can be relatively easily adopted for the determinations of individual lanthanide elements in certain kinds of technical materials, concentrates, precursors, etc., where the high speed and low costs of analysis characteristics of capillary electrophoresis (CE) may be advantageously exploited. Electrophoretic techniques may also be employed for speciation studies, especially for examinations of the behavior of actinides in the environment.

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Section: Applicationsmentioning

confidence: 99%

Section: Separation Modes and Strategiesmentioning

confidence: 99%

Analytical separations of lanthanides and actinides by capillary electrophoresis

Janoš

2003

Electrophoresis

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“…One strategy for rare earth metal separation is through electrokinetic techniques such as capillary zone electrophoresis (CZE) and isotachophoresis (ITP). Both CZE [] and ITP [] have been used for rare earth metal separations; they take only a matter of minutes to separate many different analytes []. The method chosen for investigation in this paper is ITP because of its ability to concentrate analytes.…”

Section: Introductionmentioning

confidence: 99%

“…Many different ligands have been used in the literature for complexation with Ln including HIBA [], citric acid [], ethylenediaminetetraacetic acid [], lactic acid [], or a combination of multiple complexing agents []. For this study, HIBA has been selected as the primary binding ligand due to the variety of literature examples using HIBA and because the β for the reactions between HIBA and the individual Ln are given through the National Institutes of Standards and Technology as log( β ) values [].…”

Section: Introductionmentioning

confidence: 99%

One‐dimensional simulation of lanthanide isotachophoresis using COMSOL

2012

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Electrokinetic separations can be used to quickly separate rare earth metals to determine their forensic signature. In this work, we simulate the concentration and separation of trivalent lanthanide cations by isotachophoresis. A one-dimensional simulation is developed using COMSOL v4.0a, a commercial finite element simulator, to represent the isotachophoretic separation of three lanthanides: lanthanum, terbium, and lutetium. The binding ligand chosen for complexation with the lanthanides is α-hydroxyisobutyric acid (HIBA) and the buffer system includes acetate, which also complexes with the lanthanides. The complexes formed between the three lanthanides, HIBA, and acetate are all considered in the simulation. We observe that the presence of only lanthanide:HIBA complexes in a buffer system with 10 mM HIBA causes the slowest lanthanide peak (lutetium) to split from the other analytes. The addition of lanthanide:acetate complexes into the simulation of the same buffer system eliminates this splitting. Decreasing the concentration of HIBA in the buffer to 7 mM causes the analyte stack to migrate faster through the capillary.

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“…Only exceptionally has HIBA been employed for the chromatographic separations of divalent metal cations [8,12,20,21]. HIBA was also successfully used in other separation techniques such as capillary isotachophoresis (ITP) [22][23][24] and capillary electrophoresis (CE) [25,26] -again for the separations of lanthanides in the first place.…”

Section: Introductionmentioning

confidence: 99%

Ion-chromatographic separation of metal cations in the presence of a-hydroxyisobutyric acid

Janoš

Chromá

Kubáň

1996

Analytical and Bioanalytical Chemistry

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Separations of metal cations on a column packed with the strongly acidic cation exchanger Separon SGX CX were investigated in the presence of alpha-hydroxyisobutyric acid (HIBA) in the mobile phase. A retention model based on the general theory of side equilibria was elaborated and relations describing dependences of capacity factors of analytes on the compositon of the mobile phase were derived. Effects of HIBA concentration and pH of the mobile phase on the analyte retention were studied in detail. Stability constants of divalent metal cations (Cd(2+), Co(2+), Mn(2+), Ni(2+) and Zn(2+)) with HIBA were calculated from the experimental dependences of the reciprocal values of capacity factors on the ligand concentration.

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Isotachophoretic separation of rare earth ions I. Separation behaviour of yttrium and fourteen lanthanide ions forming complexes with tartaric acid and α-hydroxyisobutyric acid

Cited by 17 publications

References 10 publications

Analytical separations of lanthanides and actinides by capillary electrophoresis

Analytical separations of lanthanides and actinides by capillary electrophoresis

One‐dimensional simulation of lanthanide isotachophoresis using COMSOL

Ion-chromatographic separation of metal cations in the presence of a-hydroxyisobutyric acid

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