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A dynamic flow model, which maps carrier gas pressures and carrier gas flow rates through the first dimension separation column, the modulator sample loop, and the second dimension separation column(s) in a pulsed-flow modulation comprehensive two-dimensional gas chromatography (PFM-GC×GC) system is described. The dynamic flow model assists design of a PFM-GC×GC modulator and leads to rapid determination of pneumatic conditions, timing parameters, and the dimensions of the separation columns and connecting tubing used to construct the PFM-GC×GC system. Three significant innovations are introduced in this manuscript, which were all uncovered by using the dynamic flow model. A symmetric flow path modulator improves baseline stability, appropriate selection of the flow restrictors in the first dimension column assembly provides a generally more stable and robust system, and these restrictors increase the modulation period flexibility of the PFM-GC×GC system. The flexibility of a PFM-GC×GC system resulting from these innovations is illustrated using the same modulation interface to analyze Special Antarctic Blend (SAB) diesel using 3 s and 9 s modulation periods.

Item Type:	Refereed Article
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Separation Science
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
Author:	Harvey, PM (Mr Paul Harvey)
Author:	Shellie, RA (Associate Professor Robert Shellie)
Author:	Haddad, PR (Professor Paul Haddad)
ID Code:	63186
Year Published:	2010
Funding Support:	Australian Research Council (DP0771893)
Web of Science® Times Cited:	10
Deposited By:	Austn Centre for Research in Separation Science
Deposited On:	2010-04-19
Last Modified:	2015-01-28
Downloads:	0