Presentation Profile
Nano Volume Injector Valve for Fast and Ultra Fast Gas Chromatography Analysis
Currently Scheduled: 1/18/2018 - 10:35 AM - 11:05 AM
Room: Exhibit Hall Classroom (End of 200 Aisle)
Main Author
Stanley D. Stearns - Valco Instruments Co. Inc.
- Martin Brisbin - Valco Instruments Co. Inc.
- Huamin Cai - Valco Instruments Co. Inc.
Abstract:
For fast and ultra-fast GC analysis, injection is one of the most important processes. A narrow band start peak is essential for a high quality fast GC separation. Commonly people use split injection to obtain a narrow band peak. However, the split injection dilutes the concentration of sample, consequently reducing the overall method sensitivity. The split injection may also cause a sample discrimination problem which will affect the accuracy of quantification. Another sharp peak creation method is the use of cryogenic refocus technology, but it is only suitable for high boilers. Partial volume injection or dual valves partial volume injection is another method to achieve a narrow band sample peak, but the amount being injected is influenced by many factors, such as timing, flow, pressure, temperature etc. which negatively affects the repeatability. In this presentation, we will discuss the relationship between valve volume and peak broadening and show the results of using a nano volume valve for a fast and ultra fast GC injection system. Since both internal volume and dead volume of the nano volume valve are really small (nL level) it can create sharp injection peaks without tailing. By using this system, a methane peak with only 8 millisecond peak width at half height W1/2 has been achieved. It only needs 2 seconds to complete separate C1 to n-C6 and BETX.
