Separation and determination of thorium, uranium and mixed rare-earth elements as their UV/Vis absorbing complexes by capillary zone electrophoresis

Liu, Bi-Feng; Liu, Liang-Bin; Cheng, Jie

doi:10.1016/s0039-9140(98)00137-4

Cited by 53 publications

(22 citation statements)

References 16 publications

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“…U was determined by CZE in the presence of transition metals in the form of its chelate with 4-(2-thiazolylazo)resorcinol (TAR) [62]. Liu et al [64] for the determinations of Th, U, and REEs. Using these rather voluminous ligands, U and Th can be separated from REEs, whereas the lanthanides form a single (unresolved) peak and may be determined as a group only, as shown in Fig.…”

Section: Separation Modes and Strategiesmentioning

confidence: 99%

“…There were several attempts to enhance the detection sensitivity with the aid of agents capable of forming intensively colored (or UV-absorbing) chelates with the separated ions, e.g. arsenazo III [42,43,60,61], PAR [43], TAR [62], TBDA [63] or DBC-As [64]. Using a microchip CE apparatus with light-emitting diode (LED) detection at 600 nm, a detection limit of 23 mg?L 21 was achieved for U(VI) after complexation with arsenazo III [42].…”

Section: Detectionmentioning

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: Separation Modes and Strategiesmentioning

confidence: 99%

Section: Detectionmentioning

confidence: 99%

Analytical separations of lanthanides and actinides by capillary electrophoresis

Janoš

2003

Electrophoresis

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“…However, two main difficulties hampered its frequent use: sensitivity (most metal ions do not absorb ultraviolet (UV)-visible light) and selectivity (difficulty to resolve two metal ions) that have similar or identical mobility relying only on the migration behavior as their free forms [1]. With the passage of time, these problems are overcome by various modifications in background electrolyte (BGE) and capillary coatings.…”

Section: Introductionmentioning

confidence: 99%

Bis(salicylaldehyde) orthophenylenediamine as complexing reagent in simultaneous determination of gold, chromium, iron, uranyl, and nickel using capillary zone electrophoresis

Soomro¹,

Memon²,

Ahmed³

et al. 2012

Acta Chromatographica

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Summary. Bis(salicylaldehyde) orthophenylenediamine (BSOPD) is reported here as a complexing reagent for simultaneous determination of six metal ions, gold, chromium, iron(II)/(III), uranyl, and nickel, by capillary zone electrophoresis. The pre-derivatized complexes were injected onto 50 cm bare silica capillary (i.d. 75 μm) with background electrolyte 50 mM citrate:oxalate buffer in 1:1 at pH 4. All metal ions were separated within 15 min including coexisted ions at applied voltage of −15 kV at detection wavelength of 250 nm. Under the abovementioned conditions, limits of quantification and detection were found to be 0.5, 1.0, 1.0, 10.0, 1.0, and 10.0 μg mL −1 ; and 0.16, 0.33, 0.33, 3.33, 0.33, and 3.33 μg mL −1 for Au(III), Cr(VI), Fe(III), Fe(II), UO 2 (II), and Ni(II), respectively. Linear calibration graphs were obtained in the ranges of 0.5-100, 1-200, 10-100, 1-100, 1-100, and 10-200 μg mL −1 with the correlation coefficient values 0.9964, 0.9948, 0.9900, 0.9999, 0.9992, and 0.9918 for Au(III); and Cr(VI), Fe(III), Fe(II), UO 2 (II), and Ni(II), respectively. Applicability of the method has been evaluated by determining gold from wastewater samples of goldsmith factories and uranyl from ore samples. The developed method was also used for the determination of chromium in selected environmental waters (drinking and polluted). The data obtained with developed method were compared with those obtained from atomic absorption spectroscopy, and the results of the analysis were found to be in good agreement.

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“…Many methods have already been developed for the determination of uranium and thorium. These days, the methods include inductively coupled plasma atomic emission spectrometry (ICP-AES), 1 inductively coupled plasma-mass spectrometry (ICP-MS), 2,3 ion chromatography (IC), 4 capillary zone electrophoresis (CZE), 5 and flow injection analysis (FIA).…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric simultaneous determination of uranium and thorium using partial least squares regression and orthogonal signal correction

Ниази

2006

J. Braz. Chem. Soc.

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Um novo método espectrofotométrico, simples e sensível, foi descrito para determinação simultânea de urânio e tório. O método é baseado na formação de complexos de urânio e tório com Arsenazo III em pH 3,0. Todos os fatores que afetam a sensibilidade foram otimizados e o intervalo dinâmico linear para determinação de cada analito foi encontrado. A determinação simultânea de urânio e tório em misturas empregando métodos espectrofotométricos é dificultada pela ocorrência de interferências espectrais. Usando métodos de calibração multivariada, tais como mínimos quadrados parciais (PLS), é possível obter um modelo ajustado aos valores das concentrações das misturas usados no intervalo de calibração. A correção do sinal ortogonal (OSC) é uma técnica de pré-processamento usada para remover informações não relacionadas às variáveis alvo, empregando análise de componentes principais restrita. OSC é um método de pré-processamento adequado para a calibração PLS de misturas, sem perda da capacidade de predição, usando-se método espectrofotométrico. Neste estudo, o modelo de calibração é baseado no espectro de absorção, no intervalo de 600-760 nm para 25 diferentes misturas de urânio e tório. Matrizes de calibração foram obtidas a partir de soluções contendo 0,10-21,00 e 0,25-18,50 μg mL -1 de urânio e tório, respectivamente. Os valores de RMSEP (raiz quadrada do erro médio de predição) para urânio e tório com OSC e sem OSC foram 0,4362; 0,4183 e 1,5710; 1,0775, respectivamente. Esse procedimento possibilita a determinação simultânea de urânio e tório em amostras reais e sintéticas com adequada confiabilidade na determinação.A simple, novel and sensitive spectrophotometric method was described for simultaneous determination of uranium and thorium. The method is based on the complex formation of uranium and thorium with Arsenazo III at pH 3.0. All factors affecting the sensitivity were optimized and the linear dynamic range for determination of uranium and thorium found. The simultaneous determination of uranium and thorium mixtures by using spectrophotometric methods is a difficult problem, due to spectral interferences. By multivariate calibration methods such as partial least squares (PLS), it is possible to obtain a model adjusted to the concentration values of the mixtures used in the calibration range. Orthogonal signal correction (OSC) is a preprocessing technique used for removing the information unrelated to the target variables based on constrained principal component analysis. OSC is a suitable preprocessing method for PLS calibration of mixtures without loss of prediction capacity using spectrophotometric method. In this study, the calibration model is based on absorption spectra in the 600-760 nm range for 25 different mixtures of uranium and thorium. Calibration matrices contained 0.10-21.00 and 0.25-18.50 μg mL -1 of uranium and thorium, respectively. The RMSEP for uranium and thorium with OSC and without OSC were 0.4362, 0.4183 and 1.5710, 1.0775, respectively. This procedure allows the simultaneous determina...

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Separation and determination of thorium, uranium and mixed rare-earth elements as their UV/Vis absorbing complexes by capillary zone electrophoresis

Cited by 53 publications

References 16 publications

Analytical separations of lanthanides and actinides by capillary electrophoresis

Analytical separations of lanthanides and actinides by capillary electrophoresis

Bis(salicylaldehyde) orthophenylenediamine as complexing reagent in simultaneous determination of gold, chromium, iron, uranyl, and nickel using capillary zone electrophoresis

Spectrophotometric simultaneous determination of uranium and thorium using partial least squares regression and orthogonal signal correction

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