Polyoxyethylene as the stationary phase in ion chromatography
Lee Wah Lim1, Li Rong, Toyohide Takeuchi
1Department of Chemistry, Faculty of Engineering, Gifu University, Japan.
Summary
Polyethylene glycol (PEG) and polyoxyethylene (POE) stationary phases offer novel methods for ion chromatography. These phases enable effective separation of inorganic anions, even in complex samples like seawater.
Area of Science:
- Analytical Chemistry
- Separation Science
Background:
- Ion chromatography is crucial for analyzing inorganic anions.
- Traditional stationary phases can be limited by matrix effects and eluent concentration.
Purpose of the Study:
- To review the application of polyethylene glycol (PEG) and polyoxyethylene (POE) as stationary phases for inorganic anion separation.
- To elucidate the retention mechanisms involved in ion chromatography using these novel phases.
Main Methods:
- Review of studies utilizing PEG and POE stationary phases in ion chromatography.
- Analysis of anion retention mechanisms, including partition and ion-exchange modes.
- Investigation of eluent concentration effects and matrix interference mitigation.
Main Results:
- PEG coated on hydrophobic phases retains anions via partition, allowing high-eluent concentrations and effective trace anion determination in seawater.
- Chemically bonded POE phases exhibit anion retention in an ion-exchange mode, mediated by trapped eluent cations.
- Anion separation is achievable using crown ether (cyclic POE) as an eluent additive with hydrophobic phases.
Conclusions:
- PEG and POE stationary phases provide versatile and effective platforms for inorganic anion separation in ion chromatography.
- These novel phases offer advantages in handling complex matrices and enabling sensitive trace analysis.
- Understanding the retention mechanisms is key to optimizing separation conditions and expanding applications.
Related Concept Videos
01:09Ion-Exchange Chromatography
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
01:17Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
01:17Gas Chromatography: Types of Columns and Stationary Phases
Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
01:11High-Performance Liquid Chromatography: Introduction
High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
In HPLC, two phases play a critical role in the separation process:
01:09Analyte Adsorption and Distribution
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...
01:10Chromatography: Introduction
Chromatography is a technique used to separate compounds based on differences of partitioning between two phases, the stationary phase and the mobile phase.
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...