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Temperature effect on peak width and column efficiency in subcritical water chromatography
Yu Yang1, Lori J Lamm, Ping He
1Department of Chemistry, East Carolina University, Greenville, NC 27858, USA. yangy@mail.ecu.edu
Journal of Chromatographic Science
|March 8, 2002
Summary
Subcritical water chromatography uses hot water as a mobile phase, reducing organic solvent use. Optimal column efficiency for separations is achieved between 100-120°C, with higher temperatures decreasing efficiency.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Subcritical water chromatography (SWC) utilizes hot, pressurized water as a mobile phase, offering an eco-friendly alternative to organic solvents in reversed-phase liquid chromatography.
- While temperature effects on retention are known, quantitative studies on peak width and column efficiency in SWC are lacking.
Purpose of the Study:
- To quantitatively investigate the impact of temperature on peak width and column efficiency in subcritical water chromatography.
- To determine the optimal temperature range for maximizing column efficiency in SWC separations.
Main Methods:
- Separation of polar and chlorinated compounds using pure subcritical water.
- Utilized various stationary phases: Zorbax RX-C8, PRP-1 (polystyrene-divinylbenzene), Hypersil ODS, and ZirChrom-polybutadiene.
- Performed isothermal separations across a temperature range of 60°C to 160°C.
Main Results:
- Increasing temperature reduced analyte retention time and peak width.
- Column efficiency initially improved or remained stable up to 100-120°C.
- Column efficiency decreased significantly at temperatures above 120°C.
Conclusions:
- A distinct optimum temperature range (100-120°C) exists for maximizing column efficiency in subcritical water chromatography.
- Temperature plays a critical role in balancing retention, peak shape, and efficiency in SWC.