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Improving Resolution and Analysis Time for Gas Chromatographic Analysis, Using a Tandem Column Ensemble and Stop-Flow Modulation
Frank L. Dorman, Ph.D., Rebecca Wittrig, Ph.D., Chris M. English,
and Richard D. Sacks, Ph.D.
Analytical laboratories are constantly striving to improve sample throughput in order to meet customer needs. This has resulted in a new focus area for gas chromatography (GC), called high-speed gas chromatography. Various areas of the GC system have been investigated, including inlet systems, micro-bore columns, high-speed temperature programming, and column ensembles with tunable selectivity. These techniques may have a positive impact on sample turnaround.
Tunable selectivity is in its infancy and is showing significant reductions in analytical run times, with excellent control of peak resolution. In a particular mode of operation, tunable selectivity is termed stop-flow GC. Stop-flow GC utilizes conventional fused silica columns and a pulsed flow carrier gas operation. This technique is one of the latest discoveries in high speed GC, and significantly reduces analysis time.
This presentation demonstrates the advantages of this new technique. It shows chromatographic conditions, using stop-flow technology, that have resulted in significant improvements in both resolution and analysis time.
For the complete article with images, please clickhere to view the file in PDF format.
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Restek Corporation
110 Benner Circle
Bellefonte, PA, 16823
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