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Comprehensive 2D Gas Chromatography |
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Comprehensive 2D Gas Chromatography —
Making GC Separations Work Harder
 By Dr. Philip Marriott, Professor of Chemistry, RMIT University, Melbourne, Australia,
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We are entering a period in its development where the expectations of comprehensive two-dimensional gas chromatography (GC×GC) should — justifiably — match the rhetoric. Since its inception about 15 years ago, researchers who have made it their (life) goal to develop and promote GC×GC have waxed lyrical about the advantages of GC×GC to the GC community. If we were to list the three primary contributions that are often ascribed to GC×GC, these would be: (i) greater separation capacity; (ii) greater sensitivity; and (iii) retention structure in the 2D data presentation that permits the analyst to identify, or predict the identity of, related compounds based on the molecular properties that control retention.
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Preventive Maintenance for GC |
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Preventive Maintenance for GC
 By Professor Walter Jennings (“Walt”)
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Professor Emeritus, University of California, Davis Co-Founder, J&W Scientific, Inc. Co-Founder, AirToxics, Ltd. Far too many practitioners install a new column, then ignore the enclosures that came with that column, and blissfully proceed to analysis. For reasons discussed below, most authorities would agree that the “typical” or “generic” test chromatograms that accompany batch-tested columns are essentially useless and can be ignored, but if the enclosures include a test chromatogram that is specific for that column, this can be valuable. The user gains a distinct advantage by purchasing individually tested columns.
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The “Replacement” Column - A recurring problem |
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The “Replacement” Column
A Recurring Problem in Gas Chromatography
By Professor Walter Jennings (“Walt”)
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Professor Emeritus, University of California, Davis
Co-Founder, J&W Scientific, Inc.
Co-Founder, AirToxics, Ltd.
For the past few years, the aging process has been catching up with the Jennings family. While I still enjoy participating in seminars and lectures, I now find seven to ten events on a two week trip is more tiring than it was just a few years ago. In addition, my wife has been successfully battling Parkinson’s disease for almost twenty years, but we realize that it is now inexorably advancing. Hence, she needs more of my time, and I must limit myself to shorter absences. Because of these developments, I permitted my Agilent contract to expire when it ran out on June 30, 2005. Agilent was sympathetic and understanding, our parting was amicable, and I still value my contacts with them. But after two months in my home office, I sometimes feel a need for the challenge of discussion and argument, and when friends at Restek asked if I would be interested in writing a short paper that was purely educational and pushing no particular product line, it sounded appealing. Here it is.
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