Packed column supercritical fluid chromatography of polysiloxanes using pure and hexane modified carbon dioxide with flame ionization and ultraviolet detection

2001 ◽  
Vol 54 (11-12) ◽  
pp. 771-775 ◽  
Author(s):  
T. A. Berger ◽  
B. S. Todd
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Packed Column ◽  
Ultraviolet Detection ◽  
Flame Ionization

Effect of Helium in Helium Headspace Carbon Dioxide Cylinders on Packed-Column Supercritical Fluid Chromatography

1996 ◽  
Vol 68 (5) ◽  
pp. 894-898 ◽  
Author(s):  
Eric Leichter ◽  
J. Thompson B. Strode ◽  
Larry T. Taylor ◽  
Frank K. Schweighardt
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Packed Column

Supercritical argon as a mobile phase for the flame photometric detection of sulfur

2003 ◽  
Vol 81 (10) ◽  
pp. 1051-1056 ◽  
Author(s):  
Kevin B Thurbide ◽  
Brad W Cooke
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Mobile Phase ◽  
Packed Column ◽  
Flow Rates ◽  
Photometric Detection ◽  
Flame Photometric Detection ◽  
Background Emission

The background emission properties of supercritical argon and supercritical carbon dioxide mobile phases in packed column supercritical fluid chromatography (pSFC) with flame photometric detection (FPD) were compared. As column flow rates were increased toward common values used in pSFC, the carbon dioxide background emission grew enormously. The resulting emission spectrum displayed dominant features at wavelengths between 325 and 525 nm, consisting of a complex series of overlapping molecular emission band systems partly attributed to CO* and CH*. By comparison, when using the same flow rates with a supercritical argon mobile phase, the background emission was identical to that of the FPD flame without column effluent. In terms of intensity, when using a column flow rate of 2 mL/min, supercritical carbon dioxide contributes a background emission in the FPD that is about 3 × 105 times larger than that produced by supercritical argon. This difference leads to an improvement of two orders of magnitude in the pSFC-FPD signal-to-noise ratio for sulfur when a supercritical argon mobile phase is used. Results indicate that supercritical argon could also be advantageous for the pSFC-FPD analysis of other elements.Key words: supercritical fluid chromatography, packed column, flame photometric detection, supercritical argon.

Packed-column supercritical fluid chromatography with splitless flame ionization detection

2004 ◽  
Vol 82 (3) ◽  
pp. 479-482 ◽  
Author(s):  
Kevin B Thurbide ◽  
Shawn Gilbert
Keyword(s):  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Packed Column ◽  
Flame Ionization Detector ◽  
Gas Flows ◽  
Ionization Detector ◽  
Flow Rates ◽  
Flame Ionization ◽  
Stable Flame

The design and characterization of a flame ionization detector (FID) that is compatible with the high flow rates of packed-column supercritical fluid chromatography (pSFC) is presented. The modified FID uses a large quartz burner (4.0 mm i.d.) in place of the conventional burner (0.4 mm i.d.) and operates a stable flame in the presence of gas flows tested up to nearly 3000 mL/min. This modification allows the full flow of effluent from a pSFC column (i.e., splitless mode) to be directed into the FID. Results demonstrate that the modified FID yields response that is within a factor of 3 to that of a commercial FID. The attributes of the modified detector indicate that this approach could be a reliable and relatively simple means of achieving a splitless pSFC-FID system.Key words: supercritical fluid chromatography, packed column, splitless, flame ionization detector.

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