Restek

Rtx-200 GC Columns

Excellent retention and separation of intermediate polar compounds

articleBanner
  • Unique polymer composition provides excellent retention and separation of intermediate polar compounds.
  • Higher thermal stability ensures low bleed for sensitive detectors.
  • Stable deactivation provides consistent retention, efficiency, and inertness. 
  • Pro EZGC libraries for simplified method development and optimization.

Unique Polymer Composition Enables Unique Selectivity

Restek’s Rtx-200 GC columns are coated with a trifluoropropylmethylpolysiloxane stationary phase, which provides a unique selectivity for compounds that display lone pair electrons, such as ketones, aldehydes, nitro-containing compounds, and halogen-containing compounds. The distinctive polarity of Rtx-200 columns ensures separations that often cannot be achieved with either nonpolar or polar columns—making them suitable for a broad range of analyses.

Using our Pro EZGC software to model GC separations, the retention of several common solvents was determined for three columns of different polarities: a nonpolar Rtx-1 column, a midpolar Rxi-624Sil MS column, a selective Rtx-200 column (Figure 1). Under identical analytical conditions, Rtx-200 columns provide complete resolution of these solvents and a different elution order compared to either a Rtx-1 or Rxi-624Sil MS column.

Figure 1: The unique polarity of Rtx-200 columns separates common solvents better than a nonpolar Rtx-1 column, or a midpolar Rtx-624Sil MS column.

Rtx-200

Rtx-200 column polarity

Rtx-1

Rtx-1 column polarity

Rtx-624Sil MS

Rtx-624Sil MS column polarity

Peaks

  1. Chloromethane
  2. Methanol
  3. Bromomethane
  4. Methylene Chloride
  5. tert-Butyl Alcohol
  6. Chloroform
  7. Benzene
  8. 1,2-Dichloroethane
  9. Dibromomethane
  10. Fluorobenzene
  11. 2-Chloroethanol
  12. Toluene
  13. Tetrachloroethene
  14. Ethylbenzene
  15. Chlorobenzene
  16. o-Xylene
  17. Styrene
  18. n-Propylbenzene
  19. Naphthalene

Conditions

Column: 30 m, 0.32 mm ID, 1.0 µm
Carrier Gas: Helium, Constant Flow @ 2.0 mL/min
Average Velocity: 40.88 cm/sec
Outlet Pressure (abs): 14.70 psi
Oven Temp.: 35 °C (hold 1 min) to 235 °C @ 30 °C/min

High Thermal Stability and Low Bleed—Ready for MS

The stable column chemistry of Rtx-200 allows thermal stability to 360 °C with low bleed. The high thermal stability of the Rtx-200 phase makes it compatible with sensitive detectors and analyses that require high temperatures.

For applications that require even lower bleed, our Rtx-200MS columns have a bleed specification lower than that of Rtx-200, making them ideal for labs using sensitive mass specs.

Figure 2: The excellent thermal stability of Rtx-200 columns ensures low bleed, even at elevated temperatures.

 

 

Figure 3: Rtx-200 columns exhibit low bleed at 360 °C, even for high molecular weight compounds like siloxanes that require higher temperatures.

 

Versatile

Rtx-200 columns are available in a variety of dimensions (lengths, IDs, and film thicknesses), and can be used for a broad range of applications, from solvents to silanes to pesticides. Due to its neutrality and inertness, Rtx-200 columns can be used to analyze acidic, basic, or neutral compounds. Its unique polarity also makes it an ideal confirmation column for many analyses because it will produce a different elution pattern compared to most other stationary phases.

CFCs

The Rtx-200 is the best non-PLOT column option that can be used with GC-MS without the need for a particle trap or cryofocusing for chlorofluorcarbons (CFCs).  This stationary phase’s unique selectivity exhibits the best retention and separation of these specific commonly found halogenated compounds (Figure 4).

Figure 4: Rtx-200 columns exhibit excellent retention and separation of chlorofluorocarbons (CFCs).

 

 

Chlorosilanes

Chlorosilanes are volatile, reactive compounds used as silylating agents and intermediates for silicone synthesis. Due to their highly reactive nature, these compounds are difficult to analyze by GC. However, a 60 m, 0.53 mm ID 3.0 µm Rtx-200 column can successfully analyze a wide range of chlorosilane compounds (Figure 5).

Figure 5: Reactive chlorosilanes analyzed using a 60 m Rtx-200 column.

 

 

Solvents

Testing solvent purity or analyzing solvents from manufacturing processes requires a column that quickly and accurately resolves a variety of industrial solvents. Rtx-200 columns are ideal for analyzing a wide range of common industrial solvents (Figure 6).

Figure 6: Rtx-200 columns can quickly and accurately analyze a wide variety of common solvents.

 

 

Pesticides in Dietary Supplements GCxGC (Secondary Column)

As shown by the extensive spread along the x and y axes, a GCxGC analysis with Rxi-5Sil and Rtx-200 columns easily separates and quantifies compounds with isobaric interferences, such as 2,4'-DDT and 4,4'-DDD (Figure 7).

Figure 7: Excellent two-dimensional separation of pesticides using orthogonal column set of Rxi-5Sil MS and Rtx-200 columns. Note 2D separation of compounds that have isobaric interferences when coeluting on Rxi-5Sil MS, 2,4’-DDT and 4,4’-DDD.

 

Simplified Analysis Optimization with Pro EZGC Software

Rtx-200 columns are supported by our Pro EZGC chromatogram modeler, allowing labs to simplify their analysis optimization. This free, easy-to-use software helps you perform GC method optimization and method development in minutes—without needing to use an instrument.

Figure 8: Rtx-200 GC columns are supported by Restek’s Pro EZGC chromatogram modeler, helping labs quickly and easily optimize their analysis.

Rtx-200 GC columns are supported by Restek’s Pro EZGC chromatogram modeler

GNSS4041-UNV