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Simplifying the setup for vacuum-outlet GC: using a restriction inside the injection port
Jaap de Zeeuw1, Shawn Reese, Jack Cochran
1Restek Corporation, Middelburg, The Netherlands. jaap.dezeeuw@restek.com
Journal of Separation Science
|May 30, 2009
Summary
Vacuum Gas Chromatography (GC) offers faster analysis times with standard GC-MS equipment. A novel injection port restriction improves vacuum GC robustness and ease of use.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Pressurized Gas Chromatography (GC) has limitations.
- Vacuum GC offers advantages like high optimal gas velocity and short analysis times with wide-bore capillary columns.
- Existing methods for vacuum GC restrictions present coupling, dead volume, and robustness challenges.
Purpose of the Study:
- To develop a more robust and user-friendly method for implementing vacuum GC using standard GC-MS systems.
- To overcome the practical challenges associated with traditional vacuum GC restriction setups.
Main Methods:
- Incorporating a restriction directly into the injection port.
- Utilizing short, narrow-bore (0.025 mm i.d.) fused-silica tubing for the restriction.
- Employing a Press-Tight connector for secure, high-temperature positioning within the injection port.
Main Results:
- The new method creates a short, high-temperature restriction, minimizing activity and inert gas leaks.
- Vacuum GC implementation becomes simpler and more robust.
- Promising data indicates improved performance and reliability.
Conclusions:
- Integrating restrictions into the injection port is a superior approach for vacuum GC.
- This innovation enhances the practicality and robustness of vacuum GC analysis.
- The method facilitates easier adoption of vacuum GC with existing GC-MS instrumentation.
