Dynamically coated columns for the separation of metal ions and anions by ion chromatography

Cassidy, R. M.; Elchuk, S.

doi:10.1021/ac00246a023

Cited by 198 publications

(69 citation statements)

References 29 publications

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“…In 1988, they demonstrated the analysis of inorganic anions by indirect UV detection on a 0.326100 mm column packed with 3 lm octadecyl silica (ODS) particles coated with hexadecyltrimethylammonium bromide using 1 mM sodium salicylate containing 5% acetonitrile eluent [38]. The basic technique of using an adsorbed lipophilic cation was modeled after the earlier work of Cassidy and Elchuk [39] in macro systems. In the same year, separation and photometric detection of monovalent cations was demonstrated in a cation exchange system (0.35650 mm, packed with 10 lm particles) with HNO 3 as eluent, a capillary scale OH --form packed column suppressor (0.35635 -40 mm) followed by an iodide-or naphthalenesulfonate-form anion exchange column for ion-replacement to improve detectability [40].…”

Section: Contributions From the Takeuchi Laboratorymentioning

confidence: 99%

Capillary ion chromatography

Kubáň

Dasgupta

2004

J of Separation Science

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Section: Contributions From the Takeuchi Laboratorymentioning

confidence: 99%

Capillary ion chromatography

Kubáň

Dasgupta

2004

J of Separation Science

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“…10,11 Reversed-phase packed-beds having high performance and high capacity were dynamically modified with alkylsulfonates added to a mobile phase; the stationary phase then acted as a cation exchanger. 12 This "dynamic ion exchanger" gave excellent efficiency and was utilized for lanthanoid separation. 13 In this study, an acidic organophosphorus compound has been applied to reversed-phase high-performance liquid chromatography (RP-HPLC).…”

Section: Introductionmentioning

confidence: 99%

High-Performance Liquid Chromatography Using Reversed-Phase Stationary Phases Dynamically Modified with Organophosphorus Compound for the Separation and Determination of Lanthanoid Elements

Tsuyoshi

Akiba

2000

ANAL. SCI.

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Organophosphorus compounds, such as di(2-ethylhexyl)phosphoric acid (DEHPA), are widely employed for the extracting separation of lanthanoid elements. Although these compounds indicate better selectivity for the mutual separation of lanthanoid elements, multistage extraction processes are required for the precise separation of adjacent elements.Various chromatographic techniques have been developed by employing these compounds as stationary phases. 1-9 Extraction chromatography using support materials loaded with extracting agents as a stationary phase has been widely investigated for the separation of inorganic substances. 1 Organophosphorus extracting reagents, such as DEHPA, 2 tributhylphosphate (TBP), 3 and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPA), 4 were applied to extraction chromatography for the separation of lanthanoid elements. Liquid-liquid partition chromatography employing support-free stationary phase, e.g., centrifugal partition chromatography 5,6 and countercurrent chromatography, 7-9 was employed for the mutual separation of lanthanoids with the aid of the DEHPA and EHPA stationary phases.The separation of lanthanoid elements has been achieved by ion-exchange chromatography in the presence of appropriate complexing agents, such as α-hydroxyisobutyric acid in the mobile phase, to enhance the separation selectivity. 10,11 Reversed-phase packed-beds having high performance and high capacity were dynamically modified with alkylsulfonates added to a mobile phase; the stationary phase then acted as a cation exchanger. 12 This "dynamic ion exchanger" gave excellent efficiency and was utilized for lanthanoid separation. 13 In this study, an acidic organophosphorus compound has been applied to reversed-phase high-performance liquid chromatography (RP-HPLC). The reversed-phase stationary phase was dynamically modified with EHPA by flowing the mobile phase of an acetone-water mixture containing the extracting reagent. A preparative modification of the stationary phase is readily available based on the partition of the reagent. This method has greater flexibility for choosing the separation conditions. The chromatographic separation of the trivalent lanthanoid ions was investigated, and the chromatographic retention behavior was compared with liquid-liquid extraction. Experimental ApparatusThe HPLC setup consisted of a Model 880-PU pump unit (JASCO Co.), a Rheodyne Model 7125 sample injection valve with a 0.1 cm 3 loop, and an ion chromatographic system (TOSOH Co.) including a Model UV-8010 spectrophotometer, a Model CD-8010 column oven, and a Model CCPM pump unit for a postcolumn reagent solution. A commercial packed column, TSKgel ODS-80TM CTR (TOSOH Co.), was used for the analytical column. Reagents2-Ethylhexylphosphonic acid 2-ethylhexyl ester (EHPA) was obtained from Daihachi Chemical Ind. Co. Ltd., and purified as described previously.5 Arsenazo III (Dojindo Lab.) was used as a postcolumn reagent for the spectrophotometric detection of lanthanoids. Katahira, Aoba, Japan An acidic...

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“…However, it is not generally easy to control the ion-exchange capacity. As for reversed-phase packing materials permanently coated with hydrophobic ions, the ion-exchange capacity can be regulated by coating conditions [2][3][4]. There is another modification method that controls the ion-exchange capacity, e. g., electrostatic modification.…”

Section: Introductionmentioning

confidence: 99%

Ion chromatography using anion-exchangers modified with dextran sulfate

et al. 1999

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SummaryRetention behavior of anions and cations on anion-exchangers modified with dextran sulfate has been investigated. Retention of anions was remarkably reduced by the modification, and the retention factor decreased with decreasing eluent concentration when sodium sulfate was used as the eluent. Cations were also retained on the modified stationary phase, and alkali and alkalineearth metal ions were separated using copper sulfate or tris(2,2'-bipyridyl)ruthenium chloride as eluent. The size of the dextran sulfate strongly affected the retention behavior of analyte ions.

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Dynamically coated columns for the separation of metal ions and anions by ion chromatography

Cited by 198 publications

References 29 publications

Capillary ion chromatography

Capillary ion chromatography

High-Performance Liquid Chromatography Using Reversed-Phase Stationary Phases Dynamically Modified with Organophosphorus Compound for the Separation and Determination of Lanthanoid Elements

Ion chromatography using anion-exchangers modified with dextran sulfate

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