Fused silica open tubular

Restek Rtx-IMS fused-silica open-tubular column (FSOT) with integral guard column, 30 m X 0.25-mm i.d. and 0.25-p.m film thickness Eppendorf fixed-volume pipets, 0.50-mL Eppendorf fixed-volume pipefs, 1.0-mL Eppendorf pipel lips, 1.0-mL Amber-glass boftles wifti Teflon-lined caps, 4-oz... 

Figure 2.5 Apparatus for drawing polyver-clad, flexible, fused-silica open tubular colunns.

Virtually all current research in SFC utilizes either small bore packed columns with particles of 5-10 micrometers in diameter optimized for use in liquid chromatography or narrow bore, fused silica open tubular columns with Immobilized phases similar to those used in gas chromatography. In the latter case columns of saaller internal diameter, 10-100 micrometers, shorter lengths (generally less than 20 m with 1-10 m being the most common length), and more firmly crosslinked stationary phases are used by coaparison with standard columns for gas chromatography. In all... 

Figure 24-3 (a) Porous carbon stationary phase (2 p,m thick) on inside wall of fused silica open tubular column. (fc>) Chromatogram of vapors from the headspace of a beer can. obtained with 0.25-mm-diameter x 30-m-long porous carbon column operated at 30°C for 2 min and then ramped up to 160°C at 20°/min. [Courtesy Alltech Associates, State College, PA.]... 

Gas Chromatograph -- A Varian 6000 equipped with two constant-current/pulsed-frequency electron capture detectors, a 30-m x 0.53-mm ID DB-5 fused-silica open-tubular column (1.5-/xm film thickness), and a 30-m x 0.53-mm ID DB-1701 fused-silica open-tubular column (1.0-/im film thickness), both connected to a press-fit Y-shaped fused-silica inlet splitter (Restek Corporation, Bellefonte, Pennsylvania), was used to analyze for the nitroaromatic compounds. The columns were temperature-programmed from 120°C (1.0-min hold) to 200°C (1-min hold) at 3°C/min, then to 250°C (4-min hold) at 8°C/min injector temperature 250°C detector temperature 320°C helium carrier gas 6 mL/min nitrogen makeup gas 20 mL/min. 

High resolution fused silica capillary columns were used to examine, and in some cases to compare, flavor and aroma essences obtained by 1) direct headspace injection, 2) simultaneous steam distillation extraction, 3) standard Soxhlet extraction using dichloromethane, and 4) high pressure Soxhlet extraction using liquid CO2 Developments in smaller- and larger-diameter fused silica open tubular columns, and columns coated with a bonded polyethylene glycol stationary phase were also explored. 

Figure 9. Results of the direct substitution of a large-bore fused silica open tubular column. Solutes (in order of elution) 4-chlorophenol, dodecane, 1-decylamine, 1-undecanol,...

Jain V, Phillips JB. Fast temperature programming on fused-silica open-tubular capillary columns by direct resistive heating. J Chromatogr Sci 1995 33 ... 

M Fused-silica open tubular columns (FSOT columns) are currently the most widely used GC columns. 

Fused-silica open tubular (FSOT) column A wall-coated gas chromatography column that has been fabricated from purified silica. 

The column, including the packing, is the heart of the chromatograph. Columns used for residue detection usually are made out of glass or fused silica. FSOT means fused silica open tubular. Table 20-2 shows current nomenclature for columns based on their inner diameter (i.d.). Figure 20-16, p. 222, shows several columns for GLC. 

The following is a list of items associated with fused silica open tubular (FSOT) capillary columns. 

FSOT Fused silica open tubular SFE Supercritical fluid extraction... 

Figure 2.14. Schematic diagram of a drawing machine for producing polymer-clad, fused silica open tubular columns.

The retention index system has the advantage of being based on readily available reference materials that cover a wide boiling range. In addition, the temperature dependence of retention indexes is relatively small. In 1984 Sadtier Research Laboratories introduced a library of retention indexes measured on four types of fused-silica open tubular columns. The computerized format of the database allows retention index searching and possible identity recall with a desktop computer. Measurement of retention indexes is the basis of the Rohrschneider-McReynolds scheme for classification of stationary phases in GC (see Section 27C-4),... 

Considering the close relationship between the deactivation degree of the column wall and the deposed layer of the stationary phase, use of films thinner than 0.1 pm should be avoided, especially for the separation of labile pesticides. Fused silica open tubular columns of 25-30 m length, 0.20-0.25 mm internal diameter, and 0.15-0.33 pm film thickness should be considered as the first choice. 

Figure 11.4 Schematic of a fused silica open tubular column for chromatography.

Figure 22-2 Cross-sectional view of wall-coated, support-coated, and porous-layer columns. Micrograph shows porous carbon stationary phase on inside wall of a fused-silica open tubular column.

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