Determination of inorganic anions in river water by column-coupling capillary isotachophoresis

Zelenský, I.; Zelenská, V.; Kaniansky, Dušan; Havaši, P.; Lednárová, V.

doi:10.1016/s0021-9673(01)96137-0

Cited by 44 publications

(13 citation statements)

References 14 publications

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“…MCE separations of model and real samples revealed very good repeatabilities of migration times (RSD below 1.2%) and peak areas (RSD below 3%) of analytes. Beside this, LODs (1-2 μmol L -1 ) as reached by the conductivity detection for studied analytes were more than sufficient for water monitoring and compared very well with those reported previously for CE [8,11,15] or MCE [7,30]. Nevertheless, the developed method cannot reach the detectability of some of the anions studied in other environmental matrices, e.g.…”

Section: Resultssupporting

confidence: 85%

“…In addition, under such separating conditions, fully ionized analytes can be usually resolved only via differences in their ionic mobilities. Many inorganic anions can be separated by CE or MCE at low pH values, as well [2,[7][8][9][10][11][12]. This approach offers an enhanced analytical selectivity, especially in situations when anions are to be determined in ionogenic matrices, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Determination of chloride, sulfate and nitrate in drinking water by microchip electrophoresis

et al. 2012

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We report on a method for simultaneous determination of chloride, sulfate and nitrate in drinking water by microchip electrophoresis. By adjusting a pH value of 4.2 in the aspartate background electrolyte, and by applying separation mechanisms via the ionic strength effect (bis-tris propane) and association equilibria (N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate), a complete resolution of analytes from other co-migrating constituents is accomplished. In addition, isotachophoretic preconcentration of nitrate was implemented directly on the microchip. The ions were detected via conductivity measurements after injecting 900-nL samples. The limits of detection range from 40 to 120 μg L -1 . The method displays a high reproducibility of the migration velocities under suppressed hydrodynamic and electroosmotic flow and therefore allows for a precise quantitation of analytes. The total analysis time is <450 s, and the working range is up to 60 mg L -1 for chloride and sulfate, and of up to 20 mg L -1 for nitrate. Filtration and degassing are the only sample treatment steps prior to analysis. The use of an internal standard enabled an easy chip-to-chip transfer of the method.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Determination of chloride, sulfate and nitrate in drinking water by microchip electrophoresis

et al. 2012

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“…Isotachophoresis measurement has proved to be a powerful tool for the separation and quantification of ionic species, and has been applied in various fields; for example, biochemistry [1][2][3][4], medicinal chemistry [5][6][7][8], industrial chemistry [9][10][11][12], environmental chemistry [13][14][15][16], and elslewhere [17][18][19][20]. These studies have been carried out for analyses of organic acids, polymers, and metals.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the critical micelle concentrations and the aggregation numbers of sodium alkyl sulfates by capillary-type isotachophoresis

Ogino

Kakihara

Abe

1987

Colloid & Polymer Sci

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Abstract:The analytical procedure for the separation and quantification of bulk and micellar phases for sodium alkyl sulfates has been investigated by a capillary-type isotachophoresis using a potential gradient detector. Monomer solutions were distinguished from micellar solutions at pH 5.5-6.0; hydrochloric acid-L-Histidine mixture was used as the leading electrolyte and 2-(N-Morpholino) ethanesulfonic acid as the terminating electrolyte.The potential unit value (PU value) due to the monomer solutions was larger than that due to the micellar solutions. The zone length due to monomer solutions increased with increasing concentration of surfactant until a given concentration (CMC); beyond this point the values became constant. On the other hand, the zone length due to micellar solutions increased from this point. We report an applicability of capillary-type isotachophoresis to determination of the CMC's and aggregation number for various sodium alkyl sulfates.

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“…A limited dynamic concentration range (molar ratio 1:100) in a single-capillary CITP instrument overcame the introduction of 2-D CITP in a column-coupling analyzer. Such an arrangement [27] used in water analysis enabled the determination of macroconstituents (nitrate, sulfate) in the preseparation and microconstituents (nitrite, fluoride, phosphate) in the analytical capillary. The simultaneous determination of chloride, nitrate and sulfate was reported by Vacík and Muselasovµ [17].…”

Section: Naturally Occurring Food Constituentsmentioning

confidence: 99%

Application of isotachophoresis in food analysis

Kvasnička

2000

Electrophoresis

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Determination of inorganic anions in river water by column-coupling capillary isotachophoresis

Cited by 44 publications

References 14 publications

Determination of chloride, sulfate and nitrate in drinking water by microchip electrophoresis

Determination of chloride, sulfate and nitrate in drinking water by microchip electrophoresis

Estimation of the critical micelle concentrations and the aggregation numbers of sodium alkyl sulfates by capillary-type isotachophoresis

Application of isotachophoresis in food analysis

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