Metal ion speciation and capillary electrophoresis: Application in the new millennium

Ali, Imran; Gupta, Vinod K.; Aboul‐Enein, Hassan Y.

doi:10.1002/elps.200500216

Cited by 126 publications

(37 citation statements)

References 97 publications

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“…In the present case, since both uranyl and ferric ions (in their hydrated form) have little difference in their charge densities, it is difficult to separate them under normal conditions and addition of a complexing agent is essential for their separation. The organic ligands reported in literature for complexing Fe(III) in CE studies [30][31][32][33][34][35][36]39] may not be suitable in the present case due to the reasons already mentioned above. Hence, it was proposed to consider chloride as ligand as well as carrier electrolyte since its complexation ability with UO 2 2+ and Fe 3+ ions is different and they tend to form cationic complexes of different charges.…”

Section: Resultsmentioning

confidence: 89%

Rapid Separation and Quantification of Iron in Uranium Nuclear Matrix by Capillary Zone Electrophoresis (CZE)

Mishra¹,

Das²,

Jeyakumar³

et al. 2011

AJAC

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A method was developed for rapid separation and determination of iron by employing capillary zone electrophoresis (CZE) technique with direct UV detection. Iron could be separated from matrix uranium by direct injection of dissolved sample solution into capillary using a mixture of 10 mM HCl and 65 mM KCl (pH = 2) as background electrolyte (BGE) at an applied voltage of 15 kV. The developed method has a very high tolerance for the matrix element U (100 mg/mL) and as such may not need prior separation of iron from the matrix. Iron could be separated with better than 95% recovery. The method showed a linear calibration over a concentration range 1-50 ppm of Fe(III). The migration times for the iron peak were reproducible within 1% for both pure Fe(III) and in presence of matrix uranium (80 mg/mL). The precision (RSD, n = 22) of peak area obtained for 1 ppm of iron was 3.5%. The limit of detection (LOD) (3) was 0.1 ppm and the absolute LOD was 9 × 10 -14 g considering the sample injection volume of 1.5 nL. The developed method has been validated by separating and determining iron in two certified reference materials of U 3 O 8 . The method was applied for the determination of iron in different uranium based nuclear materials. The CZE method is versatile for routine analysis as it is simple, rapid and has simple sample preparation procedure.

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Section: Resultsmentioning

confidence: 89%

Rapid Separation and Quantification of Iron in Uranium Nuclear Matrix by Capillary Zone Electrophoresis (CZE)

Mishra¹,

Das²,

Jeyakumar³

et al. 2011

AJAC

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“…Efficient and sensitive analytical methods, capable of distinguishing various forms of mercury, are of great importance for understanding transport mechanisms, distribution, and toxic properties of mercury species in any ecosystem. CE offers a potential for element speciation; however, to date, no comprehensive review article on mercury speciation by CE is available, although several general review papers [5][6][7][8][9] and book chapters [10,11] on speciation of various metals by CE have been published. In this review, we provide an overview of methods for mercury speciation by CE.…”

Section: Introductionmentioning

confidence: 99%

Mercury speciation by CE: A review

et al. 2007

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CE methods for the speciation of inorganic and organomercury compounds are reviewed. Sample preparation, separation conditions and detection modes are discussed. Efficient separation and sensitive determination of mercury species by CE typically involves complexation with various thiols, chromogenic and other chelating agents; however, some methods do not require complexation. Spectrophotometric detection based on UV-visible absorption is by far the most commonly used. Hyphenated techniques, such as CE/inductively coupled plasma (ICP)-MS, hydride generation coupled to ICP-MS or atomic fluorescence spectrometry and CE/atomic absorption spectrometry are gaining popularity due to their high sensitivity and selectivity. Last, but not least, the potential and applications of electrochemical methods for detection of separated mercury species are outlined.

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“…Heavy metals play important roles in the environment and in human health and therefore their analysis is of increasing concern. 1,2 In the past, ion chromatography (IC), atomic absorption spectrometry (AAS) and inductively couple plasma-mass spectrometry (ICP-MS) have been the predominate methods for elemental analysis. However, there has been an increasing interest in the application of capillary electrophoresis (CE) to the separation and determination of metal species because CE has the advantages of short analysis time, high separation efficiency and low operating costs.…”

Section: Introductionmentioning

confidence: 99%

Capillary Electrophoresis for the Simultaneous Determination of Metals by Using Ethylenediamine Tetraacetic Acid as Complexing Agent and Vancomycin as Complex Selector

2006

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A new separation system of capillary electrophoresis for the simultaneous determination of metals by using ethylenediamine tetraacetic acid (EDTA) as complexing agent and employing vancomycin as complex selector was described. The Z-shape cell capillary electrophoresis was used to enhance the sensitivity for the determination of the complexes of Cu(II), Ni(II), Co(II) and Fe(III) with EDTA. The partial filling method (co-current mode) was used in order to increase the selectivity of the electrophoretic method, meanwhile vancomycin was not present at the detector path during the detection of metal-EDTA complexes. The vancomycin concentration, phosphate concentration and pH of the buffer strongly influenced mobility, resolution and selectivity of the studied analytes. Under the optimal condition, the relative standard deviations (n＝5) of the migration time and the peak area were less than 3.14% and 7.35%, respectively. Application of the Z-shape cell capillary electrophoresis method with UV detection and vancomycin loading led to the reliable determination of these metal ions in tap water and the recoveries were 97%-101%. The detection limits based on a signal to noise ratio of 3∶1 were found in the range of 2-10 µg•L -1.

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Metal ion speciation and capillary electrophoresis: Application in the new millennium

Cited by 126 publications

References 97 publications

Rapid Separation and Quantification of Iron in Uranium Nuclear Matrix by Capillary Zone Electrophoresis (CZE)

Rapid Separation and Quantification of Iron in Uranium Nuclear Matrix by Capillary Zone Electrophoresis (CZE)

Mercury speciation by CE: A review

Capillary Electrophoresis for the Simultaneous Determination of Metals by Using Ethylenediamine Tetraacetic Acid as Complexing Agent and Vancomycin as Complex Selector

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