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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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...
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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...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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High-Performance Liquid Chromatography: Introduction01:11

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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.
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High-Performance Liquid Chromatography: Elution Process01:05

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Method development for separating organic carbonates by ion-moderated high-performance liquid chromatography.

Anuja Bhalkikar1, Chris M Marin1, Chin Li Cheung1

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, USA.

Journal of Separation Science
|October 6, 2016
PubMed
Summary

A new high-performance liquid chromatography method effectively separates organic carbonates using an ion exclusion column. This validated technique is suitable for analyzing battery electrolytes, offering precise and accurate results.

Keywords:
High-performance liquid chromatographyLithium ion batteriesMethod developmentOrganic carbonates

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Organic carbonates are crucial components in lithium-ion battery electrolytes.
  • Accurate analysis of these components is essential for battery performance and safety.

Purpose of the Study:

  • To develop and validate a novel ion-moderated partition high-performance liquid chromatography (HPLC) method.
  • To enable the separation and identification of common organic carbonates.
  • To apply the method for analyzing organic carbonates in commercial lithium-ion battery electrolytes.

Main Methods:

  • Utilized an ion exclusion column with an exchangeable hydrogen ion.
  • Employed an isocratic, aqueous mobile phase with refractive index detection.
  • Optimized peak resolution by adjusting column temperature.
  • Validated the method for specificity, linearity, LOD/LOQ, precision, and accuracy.

Main Results:

  • Achieved excellent linear regression (R² > 0.9990) for calibration curves.
  • Demonstrated low limits of detection (3.8-30.8 ppm) for analyzed carbonates.
  • Showcased improved peak resolution through decreased column temperature.
  • Confirmed insignificant impact of acetonitrile on peak resolution.

Conclusions:

  • The developed HPLC method provides a reliable and sensitive approach for organic carbonate analysis.
  • The method is effective for quality control and research in lithium-ion battery development.
  • This analytical technique contributes to understanding electrolyte stability and battery longevity.