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Application Note #1

High-Speed Gas Chromatography for Process Analysis

Description of Technique:

High-speed gas chromatography (HSGC) uses short, narrow capillary GC columns in combination with specialized inlet and detection systems to perform GC analyses in a few seconds, rather than the minutes or hours of conventional separations (see Figure 2). HSGC provides obvious analysis-time advantages while permitting new applications of GC technology. Analysis precision can be improved by averaging the quantitative results from many fast analyses during the time required to perform a single conventional separation. Sensitivity can also be improved by averaging many chromatograms prior to integration and quantitation. Finally, fast analyses allow rapidly changing processes to be characterized in real-time through on-line or in-situ high-speed GC combined with special sampling systems (see Figures 1 and 3).

Example Applications:

• Measure the performance of environmental remediation or recovery devices in real time
• Troubleshoot chemical processes in real-time
• Support process start-ups with real-time analytical composition data
• Characterize chemical processes in preparation for the installation of a permanent on-line analyzer

Figure 1: Sampling and Instrumental Block Diagram:

Figure 2: Example Chromatogram:

Figure 3: Example Trend Plot1:

References

1. "Applications of Portable High-Speed Gas Chromatography to the Evaluation of New Environmental Control Technologies", S.J. Hein & W.L. Winniford ,23rd International Symposium on Environmental Analytical Chemistry, 1993.
2. "High-speed GC Analysis of VOCs: Sample Collection and Inlet Systems", M. Klemp, A. Peters, and R. Sacks, Environ. Sci. Technol., 1994, 28(8), 369A-376A.
3. "High Speed Narrow Bore Capillary Gas Chromatography", A. van Es, Huthig, Heidelberg, 1992
4. "Fast Gas Chromatography for Air Monitoring: Limits of Detection and Quantitation", H. Ke, S.P. Levine, R.F. Mouradian, and R. Berkley, Am. Ind. Hyg. Assoc. J., 1992, 53, 130-137.

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