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Ultra-High-Pressure Ion Chromatography with Suppressed Conductivity Detection at 70 MPa Using Columns Packed with 2.5
Sam Wouters1, José Luís Dores-Sousa1, Yan Liu2
1Department of Chemical Engineering , Vrije Universiteit Brussel (VUB) , Brussels , Belgium.
Analytical Chemistry
|October 15, 2019
Summary
Ultrahigh-pressure ion chromatography using 2.5 μm particles achieves high efficiency and speed. This advanced technique significantly reduces analysis time by over threefold compared to conventional methods, without sacrificing separation quality.
Area of Science:
- Analytical Chemistry
- Chromatography Science
- Separation Science
Background:
- Conventional ion chromatography (IC) faces limitations in speed and efficiency.
- Smaller stationary phase particles offer potential for improved chromatographic performance.
- Ultrahigh pressures can enhance mass transfer kinetics in chromatographic separations.
Purpose of the Study:
- To explore the application of ultrahigh pressures (UHP) in ion chromatography.
- To evaluate the performance of columns packed with 2.5 μm perfusive stationary phase particles.
- To compare the kinetic performance of UHP-IC with conventional IC systems.
Main Methods:
- Utilized ultrahigh pressures up to 70 MPa with 2.5 μm stationary phase particles.
- Employed online eluent generation and suppressed conductivity detection.
- Optimized system parameters including injection, loadability, and extra-column dispersion.
- Assessed viscous heating effects and column oven configurations (still-air vs. forced-air).
Main Results:
- Achieved isocratic separations of anions and organic acids with reduced plate heights as low as 2.1 (efficiency up to 190,000 plates/m).
- Demonstrated viscous heating effects and their impact on separation efficiency and retention.
- Observed a 10% increase in plate number with a still-air column oven.
- Achieved a maximum time gain factor of 3.4 compared to conventional IC, maintaining separation efficiency (N=10,000).
Conclusions:
- Ultrahigh-pressure ion chromatography with 2.5 μm perfusive particles offers significant advancements in speed and efficiency.
- System optimization and understanding of thermal effects are crucial for maximizing performance.
- UHP-IC provides a substantial kinetic advantage over conventional IC, enabling faster analyses without compromising separation quality.
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