Simultaneous determination of inorganic anions and cations in waters by capillary electrophoresis

Padarauskas, Audrius; Olšauskait, Vilma; Paliulionyt, Vaida

doi:10.1016/s0021-9673(98)00883-8

Cited by 34 publications

(19 citation statements)

References 25 publications

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“…As can be seen from the table, the large majority of studies showed no comparison data. For the few that did, the comparison has been mainly between CZE and IC [3,23,25,41,43,45,63,65,67,70,72,74,76,77,84,86,96,97,104,106,110,111,113,119,124,126,127,131,134,135,140,141,146,148,149,152,158,174,190,194,195,219]. Typical examples include studies by Yang et al [126], who found that results obtained using a high-sensitivity method developed using sample stacking technique together with the use of an internal standard correlated well with a standard IC method, and work by Fung and Lau [149], who examined a CZE method for the analysis of inorganic anions in rainwater and used an IC technique in parallel, reporting that the results for the major anions were within statistical variation.…”

Section: Evaluating Accuracymentioning

confidence: 99%

Quantitative capillary zone electrophoresis of inorganic anions

Paull

King

2003

Electrophoresis

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Despite the availability of commercial capillary electrophoresis systems for over ten years, where quantitative analysis is required, capillary zone electrophoresis (CZE) has often failed to replace ion chromatography as the method of choice for a large number of analytes, not least inorganic anions. To investigate the reasons for this apparent failing, a review is presented of work that has been carried out to-date involving the quantitative application of CZE to the determination of inorganic anions in industrial and environmental samples. This review summarizes work both investigating and improving the quantitative aspects of the CZE of inorganic anions. A complete survey of how CZE has been applied to the determination of inorganic anions in real samples is given, including what, if any, analytical performance parameters were investigated and quoted, and if quality assurance data and validation methods were briefly considered, thoroughly investigated or simply ignored.

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Section: Evaluating Accuracymentioning

confidence: 99%

Quantitative capillary zone electrophoresis of inorganic anions

Paull

King

2003

Electrophoresis

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“…However, migration distances of 20 cm and 30 cm were used in this work for L c and L a , respectively. Similarly, the first reported DOI-CE manuscripts by Padarauskas et al [3,4], which appeared in the literature two and eleven months, respectively, after the manuscript by Kuban and Karlberg, noted the use of a detection window placed approximately in the middle of the capillary. In these publications, total capillary lengths of 72 cm and 90 cm were employed.…”

Section: Central Detectionmentioning

confidence: 86%

“…If conditions are modified so that the typical cathodic EOF is reversed, then the reverse conditions occur (anions elute quickly but are poorly resolved and cations elute slowly or not at all with better resolution). Abbreviations: CGE, capillary gel electrophoresis; CIEF, capillary isoelectric focusing; DOI, dual-opposite injection; PT, preliminary transport; SeqEI, sequential electrokinetic injection; SeqHI, sequential hydrodynamic injection; SimEI, simultaneous electrokinetic injection Dual-opposite injection capillary electrophoresis (DOI-CE) was introduced in 1998 by Kuban and Karlberg [2] and soon after by Padarauskas and coworkers [3,4]. This technique was developed as an alternative method of simultaneous analysis for anions and cations with very fast electrophoretic mobilities.…”

Section: Introductionmentioning

confidence: 99%

Dual‐opposite injection capillary electrophoresis: Principles and misconceptions

Blackney

Foley

2016

Electrophoresis

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Dual-opposite injection capillary electrophoresis (DOI-CE) is a separation technique that utilizes both ends of the capillary for sample introduction. The electroosmotic flow (EOF) is suppressed to allow all ions to reach the detector quickly. Depending on the individual electrophoretic mobilities of the analytes of interest and the effective length that each analyte travels to the detection window, the elution order of analytes in a DOI-CE separation can vary widely. This review discusses the principles, applications, and limitations of dual-opposite injection capillary electrophoresis. Common misconceptions regarding DOI-CE are clarified.

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“…In our previous work [18,19] on the simultaneous CE separation of common inorganic anions and cations based on electromigrative sample introduction from both ends of the capillary and indirect UV detection, we used an electrolyte containing two UV chromophores: cationic imidazole or copper(II) chelate with ethylenediamine (Cu(En)22+) and anionic nitrate or chromate. However, most environmental and biological samples contain large amounts of chloride, sulfate, and hydrogen carbonate anions which interfere in the determination of anionic nitrogen species, especially nitrite.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous separation of nitrate, nitrite and ammonium by capillary electrophoresis

et al. 2000

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KeyWordsCapillary electrophoresis Nitrate, nitrite and ammonium SummaryA capillary electrophoretic method for the simultaneous separation of nitrate, nitrite and ammonium has been developed. Direct (NO3-, NO2-) and indirect (NH4 +) UV detection at 214 nm in conjunction with electromigration sampling from both ends of the capillary was used. Two electrolyte systems based on imidazole-sulfate (pH 3.8) and copper(ll)-ethylenediamine-chloride (pH 8.0) were investigated. Optimisation of the experimental parameters such as electrolyte concentration, pH, nature of the counter-ion, was studied. The method permits excellent separation of three nitrogen species in only 4 min. The analytical performance of both electrolyte systems is compared in terms of migration time and peak area repeatability and detectability. Alkaline electrolyte shows a better overall analytical performance.

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Simultaneous determination of inorganic anions and cations in waters by capillary electrophoresis

Cited by 34 publications

References 25 publications

Quantitative capillary zone electrophoresis of inorganic anions

Quantitative capillary zone electrophoresis of inorganic anions

Dual‐opposite injection capillary electrophoresis: Principles and misconceptions

Simultaneous separation of nitrate, nitrite and ammonium by capillary electrophoresis

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