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High temperature diaphragm valve-based comprehensive two-dimensional gas chromatography.

Chris E Freye1, Lan Mu1, Robert E Synovec1

  • 1Department of Chemistry, University of Washington, Box 351700 Seattle, WA 98195, USA.

Journal of Chromatography. A
|November 26, 2015
PubMed
Summary

A new high-temperature diaphragm valve enables comprehensive two-dimensional gas chromatography (GC×GC) separations up to 325°C. This advancement significantly expands the range of volatile and semi-volatile compounds that can be analyzed using GC×GC technology.

Keywords:
Comprehensive two-dimensionalGas chromatographyHigh temperatureValve-based

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Traditional diaphragm valve-based comprehensive two-dimensional gas chromatography (GC×GC) was limited to lower temperatures (175°C or 265°C).
  • These temperature limitations restricted the range of volatile and semi-volatile compounds amenable to GC×GC analysis.

Purpose of the Study:

  • To demonstrate a high-temperature diaphragm valve-based GC×GC instrument capable of separations up to 325°C.
  • To broaden the applicability of diaphragm valve-based GC×GC to a wider array of compounds and stationary phase chemistries.

Main Methods:

  • A novel diaphragm valve utilizing Kalrez O-rings was developed to overcome previous temperature limitations.
  • The instrument was tested using a 44-component mixture including alkanes, alcohols, and polyaromatic hydrocarbons with boiling points ranging from 98°C to 450°C.
  • Separation performance was evaluated based on peak shape, peak capacity in both dimensions, retention time reproducibility, and peak area variation.

Main Results:

  • The high-temperature diaphragm valve allowed GC×GC separations up to 325°C with the valve mounted inside the oven.
  • Symmetric peaks with an average second dimension (2D) peak width of 79.4ms and a 2D peak capacity of ~12 were achieved.
  • Excellent reproducibility was observed for 2D retention times (average %RSD < 0.5%) and within-analyte 2D peak widths (average %RSD < 3.0%).
  • The system demonstrated an 8-fold increase in detection sensitivity compared to one-dimensional GC due to zone compression.
  • The valve showed no performance deterioration after a year of consistent use at 325°C.

Conclusions:

  • The new Kalrez O-ring diaphragm valve significantly enhances the operational temperature range for GC×GC.
  • This advancement broadens the scope of diaphragm valve-based GC×GC to cover most common GC column chemistries.
  • The demonstrated high-temperature capability and robust performance indicate practical utility for analyzing complex mixtures like vacuum pump oil and orange oil.