GC Columns

SGE Environmental GC Columns

GC Columns

The Suite for Environmental GC Analysis

SGE GC Columns have a history of being effective columns for the separation of environmental analytes.

Since Trajan Scientific and Medical acquired the SGE business, significant focus has been invested in improving the manufacturing process and phase synthesis to ensure the performance, consistency and quality of the GC column meets the needs of the analysis in the laboratory.

The range of GC columns presented for environmental analysis now delivers improved performance, selectivity and a guarantee on delivery, making SGE GC columns by Trajan a key product for the Environmental laboratory.

End-to-End Capillary Column Manufacture

With the complete technical ability to produce GC columns from beginning to end, including the special requirements of producing fused silica capillary tubing, Trajan controls fabrication process precisely to produce the finest quality GC columns available.

The individual technology processes Trajan employs in GC column manufacture are:

  • Drawing of the precision fused silica capillary tubing.
  • Developing and synthesizing specialty polymer stationary phases.
  • Performing the specialized chemical treatment of the fused silica surface so it is inert and compatible for the
  • Cross-linked stationary phase.
  • Coating and cross-linking the polymer stationary phase.
  • Quality testing of every completed GC column to rigorous standards.

Fused Silica

The process of producing fused silica tubing is carried out on a series of sophisticated drawing towers with fine control of conditions and feedback loops to automatically make adjustments to the conditions. This ensures superb dimensional control and strength which is verified through stress proof testing of all material. By producing the fused silica in-house, Trajan has complete control of this important aspect of producing the highest quality GC columns.

The fused silica used by Trajan is very high purity devoid of impurities such as metal oxides found in conventional glasses. SGE GC columns operate comfortably to 400 °C (dependent on the phase selected).

Stationary Phase Polymer

Trajan has designed its phase synthesis so that most GC columns may be washed with solvent to remove any contamination. When a capillary column’s performance has deteriorated from extended use or contamination, performance can often be restored though washing with a suitable solvent.

Targeted Performance Testing

Test criteria are selected based on the applications that different capillary column types are targeted for, to ensure the capillary column meets the standards for that analysis. General purpose capillary columns are tested to ensure they meet inertness standards for difficult to chromatograph compounds, and run at conditions and levels designed to highlight variations in capillary column performance.

For example, Trajan’s non-polar phase BPX5 is tested using active probes such as n-decylamine and 2,4-dinitrophenol chromatographed at low concentrations (1-2 ng on capillary column for 0.25 μm film thickness) and with sufficient retained time on the run to induce tailing on all but the most highly inert GC columns.

Retention Time and Consistency

Because Trajan controls the GC column fabrication process from beginning to end, remarkably consistent retention characteristics can be achieved from column to column. When a method is established on an SGE GC column, the same separation can be expected column after column.

Enhanced retention time consistency achieved through manufacturing improvements is demonstrated here for capacity ratio (K) measured on 20 BPX5 columns showing very high congruence.

SGE Environmental GC Columns

Selectivity

SGE GC columns deliver accurate retention indices with high precision to ensuring confidence in peak identification for non-polar and polar stationary phase columns.

Retention index repeatability is shown here for 20 BP5 columns and for 20 BP20 columns.

SGE Environmental GC Columns

Thermal Stability

SGE GC columns are monitored for bleed performance with rigorous standards. Bleed is measured and specified in terms of detector signal and calibrated to “nanograms of siloxane per second” eluted from the GC columns. The test is performed at the maximum operating temperature for the GC column. Picoamp signal is highly dependent on the detector and conditions used and is not an absolute measure. Bleed measurements are carried out using FID to ensure the best performance possible.

Results from BP5MS column testing (20 columns) highlight the low bleed expected of SGE GC columns.

SGE Environmental GC Columns

GC Columns for Environmental Analysis

Phase Stationary Phase Overview Phase Structure Application Notes
BP1 100% Dimethyl Polysiloxane
  • Classic crosslinked dimethyl polysiloxane technology.
  • Low bleed.
  • 320-340 °C upper temperature limit - dependent on film thickness.
SGE Environmental GC Columns Suitable for all routine analysis.
BP5 5% Phenyl / 95% Dimethyl Polysiloxane
  • Low bleed.
  • High temperature.
  • 320-340 °C upper temperature limit - dependent on film thickness.
SGE Environmental GC Columns Suitable for all routine analysis.
BPX5 5% Phenyl Polysilphenylene-siloxane
  • High temperature.
  • Popular column range used for a wide variety of applications.
  • 360/370 °C upper temperature limit.
  • Very low bleed - ideal for trace analysis.
  • Extremely inert.
SGE Environmental GC Columns Excellent for all routine high-temperature applications.
BP5MS 5% Phenyl Polysilphenylene-siloxane
  • High temperature.
  • General purpose GC column - suitable for over 80% of all routine GC analyses.
  • 330/350 °C upper temperature limit.
  • Very low bleed - ideal for GC-MS analysis.
  • Extremely inert.
SGE Environmental GC Columns Suitable for all routine GC-MS analysis.
HT5 5% Phenyl Polycarborane siloxane
  • Ultra high temperature columns.
  • Unique phase – no equivalent phases.
  • 380/400 °C upper temperature limit.
  • Bonded and cross-linked.
  • Able to be solvent rinsed.
SGE Environmental GC Columns
  • Excellent for high-temperature applications.
  • Suited to petrochemicals and petroleum derived environmental contaminants.
HT8 8% Phenyl Polycarborane siloxane
  • High temperature.
  • Low bleed.
  • Separates PCB’s on ortho ring substitution as well as boiling point.
  • 360/370 °C upper temperature limit.
SGE Environmental GC Columns
  • Ideal for environmental analysis.
  • Preferred column for polychlorinated biphenyl (PCB) compounds.
  • Unique high temperature phase suited for the analysis of persistent organic pollutants (POPs).
BP624 Cyanopropylphenyl Polysiloxane
  • US EPA 624 optimized column.
  • 230/240 °C upper temperature limit.
  • Able to be solvent rinsed.
  • Bonded and cross-linked.
SGE Environmental GC Columns
  • Designed for volatiles analysis.
  • Ideal for EPA624, SW-846 methods 8240/8260.
  • Ideal for USP G43 method.
BP20 Polyethylene Glycol
  • Polar phase.
  • 240 – 280 °C upper temperature limit – dependent on film thickness.
  • Bonded and cross-linked.
  • Able to be solvent rinsed.
SGE Environmental GC Columns Industry standard wax column for polar compounds analysis.
SolGel- WAX Polyethylene Glycol (PEG) in a Sol-Gel matrix
  • The world’s highest temperature wax phase.
  • Bonded polyethylene glycol.
  • Less susceptible to damage by oxygen than conventional wax phases.
  • Low bleed and inert.
  • 280 °C upper temperature limit.
  • Bonded and cross-linked.
  • Able to be solvent rinsed.
SGE Environmental GC Columns Very robust high-temperature column for polar compounds analysis.

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