Investigation of solute-wall interactions in separation of uranium(vi) and lanthanides by capillary electrophoresis using on-capillary complexation with arsenazo iii

Macka, Mirek; Nesterenko, Pavel N.; Haddad, Paul R.

doi:10.1002/(sici)1520-667x(1999)11:1<1::aid-mcs1>3.0.co;2-u

Cited by 30 publications

(21 citation statements)

References 33 publications

(4 reference statements)

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“…In detailing the analytewall interactions for the anionic metal complexes of large metallochromic ligands, Macka et al [49] of the capillary wall. Strong adsorption of complexes of uranium (VI) and lanthanides with arsenazo III was observed both on uncoated fused-silica (with a negatively charged wall) and coated capillaries with neutral hydrophilic, positively charged and neutral hydrophobic surfaces.…”

Section: Basic Principlesmentioning

confidence: 99%

“…Strong adsorption of complexes of uranium (VI) and lanthanides with arsenazo III was observed both on uncoated fused-silica (with a negatively charged wall) and coated capillaries with neutral hydrophilic, positively charged and neutral hydrophobic surfaces. Dynamic coating of the bare fused-silica capillary with Carbowax 20M provided better separation performance owing to suppression of EOF and blockage of wall adsorption sites [49,50]. Another study by Haddad©s group [51], examined the role of ligand purity on the separation of metal ions as kinetically labile complexes with a metallochromic ligand contained within the carrier electrolyte.…”

Section: Basic Principlesmentioning

confidence: 99%

“…Stacking of metal analyte ions in a hydrodynamically injected large sample plug remains the most frequently applied technique useful for lowering the detection limits (see [49,87,111,116,121] among others and also Table 2). Several groups investigated the utility of an effective modification of conventional sample stacking procedure (sometimes called large-volume sample stacking) using voltage reversal between stacking and separation to remove most of the water matrix [122±124].…”

Section: Sample Introduction Modesmentioning

confidence: 99%

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Recent progress in capillary electrophoresis of metal ions

Timerbaev¹,

Шпигун²

2000

Electrophoresis

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Advances in the fundamental studies and methodology of capillary electrophoresis (CE) as applied to metal ion analysis over the last two years are reviewed, with the objective of providing the interested reader with a state-of-the-art picture of technique's potentialities in the area. In particular, novel strategies for separation selectivity control and CE system innovations designed to enhance the detection sensitivity are described. In addition, a brief overview of the primary metal analytes and samples for which the technique appears to be best suited is given. The current limitations of the technique regarding most of all the implementation for routine use are considered along with the approaches on how they could be addressed. Finally, some pointers as to the likely trends in the future research are discussed.

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Section: Basic Principlesmentioning

confidence: 99%

Section: Basic Principlesmentioning

confidence: 99%

Section: Sample Introduction Modesmentioning

confidence: 99%

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Recent progress in capillary electrophoresis of metal ions

Timerbaev¹,

Шпигун²

2000

Electrophoresis

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“…Poly(tetrafluoroethylene) (PTFE) has been the polymer used most frequently [13][14][15][16][17][18][19][20][21][22] and it seems that its use as large diameter capillaries (∼200 m) in the early papers may have originated from the previous use of about 200 m i.d. PTFE capillaries in capillary isotachophoresis (cITP) [23].…”

Section: Introductionmentioning

confidence: 99%

Poly(tetrafluoroethylene) separation capillaries for capillary electrophoresis

Macka

Yang

Zakaria

et al. 2004

Journal of Chromatography A

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“…Examples include PAR for transition metals, 4 Arsenazo I for alkaline earth metals 5 and Arsenate III for lanthanides and uranium. 6,7 Alternatively, up to 26 metal cations have been separated with parts-per-billion detection limits using indirect absorbance detection. [8][9][10][11] Regardless, the most sensitive detection scheme in CE is laser induced fluorescence (LIF).…”

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confidence: 99%

Violet Diode Laser for Metal Ion Determination by Capillary Electrophoresis-Laser Induced Fluorescence

Vos

Lucy

2001

ANAL. SCI.

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Since the work of Jorgenson and Lukacs in the early 1980s, 1,2 capillary electrophoresis (CE) has experienced rapid growth and been applied to a wide array of analytes. The dominant area of application of CE has been for biomolecules. However, there has been a steady and increasing interest in using CE for the determination of metal ions. 3The attractive features of CE for metal ion determination are the same as those for other separations: its exceptional separation efficiency; its rapid separations; and its low mass detection limits. However, as with other types of analytes, the primary limitation of CE is its poor concentration detection limits. Most (85%) publications of CE for metal ions have used absorbance detection. 3 Unfortunately, few hydrated metal ions absorb significantly above 185 nm. Greater sensitivity is achieved by complexing the metal ions with a metallochromic dye. Examples include PAR for transition metals, 4 Arsenazo I for alkaline earth metals 5 and Arsenate III for lanthanides and uranium. 6,7 Alternatively, up to 26 metal cations have been separated with parts-per-billion detection limits using indirect absorbance detection. [8][9][10][11] Regardless, the most sensitive detection scheme in CE is laser induced fluorescence (LIF). 12-14 CE-LIF determinations of metals typically use the 8-hydroxyquinoline-5-sulfonic acid (HQS) fluorescent ligand shown in Fig. 1 . Optimum excitation of the metal-HQS is at 393 nm with maximum emission in the 500 -520 nm range. 17 Fluorescence excitation of metal-HQS complexes separated by CE has been performed using the 325 nm HeCd laser line, 15,18,19 the 351.1 -364.8 nm lines of an argon ion laser 20 and with a broad band mercury-xenon lamp. 16 However, none of these excitation sources is ideal. They all are expensive and have limited lifetimes (∼5000 h). They are also relatively bulky, making them unattractive for miniaturized instruments. 19 Semiconductor or diode lasers are promising alternatives to conventional lasers. Diode lasers are cheap, require no maintenance, and have lifetimes approaching 50000 h. 21 These lasers are also extremely compact and can run off battery power.Further, the output stability of diode lasers is significantly better than that of conventional lasers (0.01% vs. 1% noise). 22 These properties suggest that diode lasers are ideally suited for LIF detection. In October of 1999, Nichia Corporation (Japan) launched the commercial sale of their InGaN-based violet laser diode.23-27 * The diode operates at 405 nm with a power output of 5 mW and has an estimated lifetime of 2000 to 5000 h. Such short wavelength semiconductor lasers have long been sought for applications such as full-color electroluminescent displays, laser printers, undersea optical communications and optical data storage. For instance, a violet diode laser would quadruple the data capacity of current DVD players.In addition to its applications in electronics and telecommunications, the violet diode laser offers tremendous potential for analytical chemistry. Recently, ...

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Investigation of solute-wall interactions in separation of uranium(vi) and lanthanides by capillary electrophoresis using on-capillary complexation with arsenazo iii

Cited by 30 publications

References 33 publications

Recent progress in capillary electrophoresis of metal ions

Recent progress in capillary electrophoresis of metal ions

Poly(tetrafluoroethylene) separation capillaries for capillary electrophoresis

Violet Diode Laser for Metal Ion Determination by Capillary Electrophoresis-Laser Induced Fluorescence

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