Micelle exclusion chromatography of inorganic anions

Okada, Tetsuo

doi:10.1021/ac00166a007

Cited by 37 publications

(21 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model of micellar exclusion chromatography 30,31 is based on Eqn (1) and takes into account that the micelles of cetyltrimethylammonium and dodecyltrimethylammonium chlorides 30 or sodium dodecyl sulfate can penetrate partly into the stationary phase (external solution). Micelles do not penetrate into the inner part of the stationary phase, but the latter contains surfactant monomers (internal solution) and ions are retained there owing to ionic interactions.…”

Section: Retention Models For Micellar Liquid Chromatographymentioning

confidence: 99%

“…Second, S m and, consequently, S hyb depend on the micelle concentration. For two sorbates (a and b) and at two concentrations of organic solvent (j 1 and j 2 ) in the mobile phase, the following equation is valid ln a 2 7ln a 1 = 7(S b hyb 7S a hyb ) (j 2 7j 1 ), (30) while combination of Eqns ( 26), ( 29) and (30) gives Eqn (31).…”

Section: Effect Of Organic Modifier Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Micellar liquid chromatography

Basova¹,

Иванов²,

Шпигун³

1999

Russ. Chem. Rev.

View full text Add to dashboard Cite

Section: Retention Models For Micellar Liquid Chromatographymentioning

confidence: 99%

Section: Effect Of Organic Modifier Concentrationmentioning

confidence: 99%

Micellar liquid chromatography

Basova¹,

Иванов²,

Шпигун³

1999

Russ. Chem. Rev.

View full text Add to dashboard Cite

“…In comparison, the use of micellar mobile phases in inorganic chromatography has been limited. Efficiency of mobile phases in the separation of cations (6,7) and anions (8,9) has been reported and reviewed by Okada (10). Mullins and Kirk-bright (11) used MLC as an alternative to ion chromatography for the separation of several inorganic anions using a cationic micellar eluent.…”

mentioning

confidence: 99%

Micellar thin‐layer chromatographic separation of heavy metal cations: Effect of organic and inorganic additives on migration behavior

Mohammad

Iraqi

Khan

1999

J Surfact & Detergents

View full text Add to dashboard Cite

The migration behavior of heavy metal cations on cellulose layers using aqueous micellar, hydro-organic, and water-organic-surfactant mobile phases was investigated. Anionic, cationic, and nonionic surfactant systems were examined over a 0.001-5% concentration range. Brij-35, a nonionic surfactant capable of forming charged complexes with some metal ions, was identified as the best surfactant. The effect of the presence of organic additives, such as dimethylsulfoxide, dimethylformamide, methanol and acetone, on the mobility of metal ions was also studied. Acetone was found to be the most effective additive at 10% concentration with 3% Brij. Quantitative determination of UO 2 2+ by spectrophotometry after preliminary thin-layer chromatographic (TLC) separation from Fe 3+ and Hg 2+ was also performed. A maximal recovery of 93% was obtained. This TLC method is rapid, with development times averaging 2 min.Paper no. S1098 in JSD 2, 523-529 (October 1999). KEY WORDS:Acetone, Brij-35, DMSO, heavy metal cations, micelles, TLC, uranium.Micellar liquid chromatography (MLC) has increased in popularity because of its unique advantages, such as the capability to simultaneously separate ionic and nonionic compounds and to provide faster analysis, higher detection sensitivity, and selectivity (1-5). The most fascinating feature of micellar systems is their dual hydrophobic and hydrophilic character, which provide electrostatic and hydrophobic sites of interaction within the aqueous mobile phase, resulting in unique separation capabilities of both ionic and nonionic solutes. As a result, micellar mobile phases have been extensively used in reversed-phase chromatographic separation of various organic compounds. In comparison, the use of micellar mobile phases in inorganic chromatography has been limited. Efficiency of mobile phases in the separation of cations (6,7) and anions (8,9) has been reported and reviewed by Okada (10). Mullins and Kirkbright (11) used MLC as an alternative to ion chromatography for the separation of several inorganic anions using a cationic micellar eluent. Kirkman et al. (12) used a variety of micellar eluants to examine the chromatographic behavior of ionic, nonionic, chelated, and organometallic metal species. Although micellar mobile phases offer enhanced selectivity, they suffer from a serious loss of efficiency when compared to traditional hydro-organic mobile phases. Dorsey et al. (13) reported that addition of low concentrations of different organic solvents to micellar mobile phases improves efficiency by reducing the adsorbed amount of emulsifier (surfactant). This unique phenomenon in MLC was attributed to the existence of a competing equilibrium in MLC and an influence of micelles on the role of organic modifiers. Khaledi et al. (14) observed simultaneous enhancement of separation selectivity and solvent strength in MLC using hybrid eluants comprising cationic or anionic micellar-organic solvents for different groups of ionic and nonionic compounds.A few studies reported the use of surfac...

show abstract

“…Micellar mobile phases have some advantages over usual hydroorganic mobile phases; e.g. they permit: (1) the determination of the partition coefficients of analytes to the micellar pseudo-phases; (2) the unique separation selectivity, which is not obtained with usual hydroorganic mobile phases; (3) stable detector responses, particularly for electrochemical detectors, against gradient elution; and (4) direct injection of samples containing very complex matrices, such as urine and blood. From these view points, a number of papers have been published which focused on the separation of organic or inorganic compounds, the retention mechanisms, and/or the applicability.l -15 In the present paper, the author points out another important aspect of micellar mobile phases, i.e.…”

mentioning

confidence: 99%

Simultaneous Separation of Ionic and Nonionic Compounds Using Reversed-Phase Micellar Chromatography

Okada

1993

ANAL. SCI.

View full text Add to dashboard Cite

Micellar mobile phases allow the separation of ionic and nonionic compounds with a single mobile phase/ column combination. Nonionic compounds such as phenols are separated together with metal ions using mobile phases containing anionic micelles and a suitable ligand. Also, the use of cationic micellar mobile phases permits the simultaneous separation of inorganic anions as well as nonionic compounds. In both cases, nonionic compounds are partitioned to the micelle and the stationary phase according to either the hydrophobicity or the lipophilicity, whereas inorganic ions electostatically interact. The separation of phenols is therefore described using an usual partition model; that of inorganic ions obeys a model involving ion-exchange equilibria. These models facilitate the prediction of the retention as well as the optimization of the separation.

show abstract

Micelle exclusion chromatography of inorganic anions

Cited by 37 publications

References 22 publications

Micellar liquid chromatography

Micellar liquid chromatography

Micellar thin‐layer chromatographic separation of heavy metal cations: Effect of organic and inorganic additives on migration behavior

Simultaneous Separation of Ionic and Nonionic Compounds Using Reversed-Phase Micellar Chromatography

Contact Info

Product

Resources

About