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Głód, Bronisław K.

doi:10.1023/a:1021933013492

Cited by 36 publications

(18 citation statements)

References 35 publications

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“…Because the dielectric constant of the organic solvent is usually smaller than that of water, less ionized samples should be retained longer. However, a significant decrease of the retention of long aliphatic chains, as well as aromatic compounds, was observed with higher concentrations of the organic modifier [2]. This confirms the occurrence of hydrophobic adsorption.…”

Section: Hydrophobic Adsorptionsupporting

confidence: 67%

“…(17)]. The potential profile in EIC is also similar to that of the agglomerated columns [2], also characterized by two different functional groups.…”

Section: Electrostatic Ion Chromatographymentioning

confidence: 60%

“…For example, decreasing the effective charge of the resin by using weak exchangers, exchangers characterized by small concentrations of the functional groups, or by adding ion interaction reagents to the mobile phase, increases the retention. This can be applied for the separation of strong electrolytes [2].…”

Section: Solution Of the Equationmentioning

confidence: 99%

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A theoretical explanation for the retention mechanism of ion exclusion chromatography

Głód¹,

Baumann

2003

J of Separation Science

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A theoretical explanation for the retention mechanism of ion exclusion chromatography Ion Exclusion Chromatography is classically used for the separation of weak acid anions. Dilute strong acids (e.g. sulphuric or perchloric acid) or just water are used as eluents. To increase the exclusion effect, strong cation exchangers, characterized by high concentration of functional groups, are applied. The inner column volume of commercially available columns is increased by increasing their size in comparison to traditional ones (usually 30067.8 mm ID). The description of the retention mechanism of this technique implicitly assumes that both mobile and stationary phases are typical aqueous solutions, and their dielectric constants are thus equal. This equality implies the equality of solute dissociation constants in both phases. Another implicit assumption is that the dead-and inner volumes of the column are constant, and independent of the mobile phase composition. The present paper shows that stationary and mobile phases are generally characterized by different physicochemical parameters. Thus, they cannot be considered as regular aqueous solutions. Additionally, we show that weak cation exchanger resins, which are characterized by a relatively small concentration of the functional groups, and weak acid based buffers can also be used in IEC. This would expand the possible applications of this method and enable, for example, the separation of strong acids (anions). The influence of ionic strength on the retention and dead-and inner column volumes is also discussed. Finally we also briefly describe the retention mechanism of Electrostatic Ion Chromatography.

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Section: Hydrophobic Adsorptionsupporting

confidence: 67%

“…(17)]. The potential profile in EIC is also similar to that of the agglomerated columns [2], also characterized by two different functional groups.…”

Section: Electrostatic Ion Chromatographymentioning

confidence: 60%

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A theoretical explanation for the retention mechanism of ion exclusion chromatography

Głód¹,

Baumann

2003

J of Separation Science

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“…Chromatography 2016, 3, 9 4 of 10 mechanisms such as hydrophobic adsorption, screening effect, solute effective charge, resin structure and number of functional group [29] have an influence on the retention of weak inorganic acids. Although the attraction of weak inorganic acids to the stationary phase could be affected by the hydrophobic adsorption of common inorganic acids on resin, which are well-known as a side-effect in the separation by IEC with a polymeric resin [30,31], the detailed mechanism will be the subject of future work.…”

Section: Ion-exclusion Chromatography With the C-cad Of Weak Inorganimentioning

confidence: 99%

The Simultaneous Determination of Silicic, Boric and Carbonic Acids in Natural Water via Ion-Exclusion Chromatography with a Charged Aerosol Detector

et al. 2016

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Abstract:The simple and simultaneous determination of silicic, boric and carbonic acids was made using ion-exclusion chromatography (IEC) and a Corona™ charged aerosol detector (C-CAD). Silicic and boric acids were separated by the column packed with a weakly acidic cation-exchange resin in H + -form and ultra-pure water eluent, and the detector responses were improved by the addition of acetonitrile to eluent. Under the optimized conditions, the simultaneous determination of weak inorganic acids, except for carbonic acid, was successfully performed. When the conversion column packed with a strong acidic cation-exchange resin in Na + -or K + -form was inserted between the separation column and the detector, weak inorganic acids including carbonic acid could be detected by the C-CAD. The calibration curves were linear in the range of 0.5-10 mg¨L´1 as Si for silicic acid (r 2 = 0.996), 10-100 mg¨L´1 as B for boric acid (r 2 = 0.998) and 1.3-21 mg¨L´1 as C for carbonic acid (r 2 = 0.993). The detection limits based on three times the standard deviation were 0.03 mg¨L´1 as Si for silicic acid, 0.40 mg¨L´1 as B for boric acid and 0.08 mg¨L´1 as C for carbonic acid. This method was applicable to river, hot spring and drinking water.

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“…For the determination of weak organic acid, ion exclusion chromatography rather than ion-exchange chromatography was often selected as an analytical method. But for the determination of aromatic acid there are only few reports [11][12][13] and the organic modifier is necessary. IEC will be unsatisfied for simultaneous analysis of fully ionized strong acids, such as aromatic sulfonic acid and inorganic anions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Retention Behavior of Aromatic Carboxylic and Sulfonic acid on a New Anion Exchange Column

2008

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Ion chromatography (IC) has gradually developed into a preferred method for the determination of inorganic anions. And in recent years some low molecular aliphatic acid can be also separated in the ion exchange column with the development of stationary phase. But for the determination of aromatic ionic compounds there are some problems. The aromatic anions show enhanced retention due to interaction with the π electrons of the aromatic backbone. Although the addition of an organic modifier can alleviate the difficulty, it is not the ultimate solution. IonPac AS20 column was developed using a unique polymer bonding technology and its substrate coating is aliphatic backbone. The polymer is completely free of any π electron-containing substituents in the AS20 column. In this paper, the retention behavior of aromatic carboxylic and sulfonic acid on two hydroxide-selective columns, IonPac AS11-HC, AS16, and the new column AS20 was also studied. The result showed that the retentions of ten compounds on three columns were different with each other because of their different column characteristics. Among them 4-chlorobenzene sulfonic acid, 3,5-dihydric benzoic acid and salicylic acid obviously exhibited the weakest retention on the IonPac AS20. It was showed that π-π bond function between anion and stationary phases was weakened in AS20 column because its polymer was completely free of any π electron-containing substituents. So in this paper the AS20 was selected as an analytical column to separate ten aromatic ionic compounds, fumaric acid with conjugate bond included. The retention behavior, separation of the ten compounds and effect of temperature on their retention in the anion-exchange column AS20 (2 mm) were studied. The result showed that those compounds could be separated with each other when running in gradient program and the organic modifier was unnecessary during the separation. So it is showed that AS20 column can be used as a separating column because its polymer is completely free of any π electron-containing substituents. Finally, the effect of temperature on the retention behavior in AS20 column was studied and it was showed that the retention of nine compounds exhibited endothermic behavior.

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Untitled

Cited by 36 publications

References 35 publications

A theoretical explanation for the retention mechanism of ion exclusion chromatography

A theoretical explanation for the retention mechanism of ion exclusion chromatography

The Simultaneous Determination of Silicic, Boric and Carbonic Acids in Natural Water via Ion-Exclusion Chromatography with a Charged Aerosol Detector

Study on the Retention Behavior of Aromatic Carboxylic and Sulfonic acid on a New Anion Exchange Column

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