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Related Experiment Videos

Quantitative aspects in comprehensive two-dimensional gas chromatography.

Minna Kallio1, Tuulia Hyötyläinen

  • 1Laboratory of Analytical Chemistry, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki, Helsinki, Finland.

Journal of Chromatography. A
|March 30, 2007
PubMed
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Investigating matrix effects in comprehensive two-dimensional gas chromatography (GC x GC) for polycyclic aromatic hydrocarbons (PAHs) revealed that while separation quality remained stable, quantitative accuracy improved with volume calibration, especially for raw samples.

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Comprehensive two-dimensional gas chromatography (GC x GC) is a powerful technique for separating complex mixtures.
  • Matrix compounds can interfere with the separation and quantification of target analytes, such as polycyclic aromatic hydrocarbons (PAHs).

Purpose of the Study:

  • To investigate the impact of increasing matrix compound concentrations on GC x GC separation of PAHs.
  • To evaluate the performance of different calibration methods (area vs. volume) for quantitative analysis of PAHs in complex matrices.

Main Methods:

  • GC x GC separation of PAHs with progressively overloaded second-dimension columns.
  • Evaluation of separation parameters: peak width, asymmetry, resolution, retention times, peak areas, and volumes.
  • Testing of two calibration methods (area and volume) using both raw and cleaned sediment extracts.

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Main Results:

  • Separation quality (peak width, asymmetry, resolution) was not significantly affected by increased matrix amounts.
  • Repeatability of retention times, peak areas, and volumes decreased with higher matrix concentrations.
  • Area calibration underestimated trace PAHs in non-cleaned samples; volume calibration, particularly external calibration, provided more accurate results for both cleaned and non-cleaned samples.

Conclusions:

  • While GC x GC separation of PAHs is robust to matrix effects, quantitative analysis requires careful consideration of calibration methods.
  • Volume calibration, especially external calibration, is recommended for accurate quantification of PAHs in complex matrices, including raw sediment extracts.