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Retention time reproducibility in comprehensive two-dimensional gas chromatography using cryogenic modulation. II. An
Robert Shellie1, Philip Marriott, Michelle Leus
1Australian Centre for Research on Separation Science, Department of Applied Chemistry, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia.
Journal of Chromatography. A
|December 3, 2003
Summary
This study confirms that the longitudinal cryogenic modulation comprehensive two-dimensional gas chromatography (GC) approach ensures reliable retention times. Interlaboratory comparisons demonstrate consistent results across multiple labs and instruments for accurate component identification.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Accurate retention times are crucial for component identification in two-dimensional (2D) separation spaces.
- Previous work established intralaboratory reproducibility for this technique.
Purpose of the Study:
- To assess the interlaboratory reproducibility of retention times in comprehensive two-dimensional gas chromatography (GC).
- To validate the reliability of the longitudinal cryogenic modulation (LMCS) approach for 2D GC separations.
Main Methods:
- An interlaboratory survey involving four independent laboratories.
- Utilized five independent gas chromatographs and five independent LMCS units.
- Data collected and analyzed from numerous operators.
Main Results:
- Demonstrated consistent retention times across the first (1D) and second dimension (2D) axes.
- Confirmed reliable comprehensive two-dimensional GC results using the LMCS cryogenic modulation approach.
- High reproducibility was observed across different laboratories, instruments, and operators.
Conclusions:
- The LMCS cryogenic modulation approach provides dependable and reproducible results for comprehensive two-dimensional GC.
- Confidence in absolute retention times is established, facilitating accurate component identification.