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Sorptive sample preparation -- a review.

E Baltussen1, C A Cramers, P J F Sandra

  • 1Notox B.V., Hambakenwetering 7, 5231DD, 's Hertogenbosch, The Netherlands. erik.baltussen@notox.nl

Analytical and Bioanalytical Chemistry
|May 16, 2002
PubMed
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Sample preparation using sorption, a dissolution-based technique, offers advantages over traditional adsorption methods. This approach enhances the analysis of polar and high-molecular-weight compounds, particularly with thermal desorption and gas chromatography.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Traditional adsorptive sample preparation methods face limitations with polar and high-molecular-weight compounds.
  • Strong retention in adsorbents can lead to incomplete desorption and artifact formation, especially during thermal desorption.

Purpose of the Study:

  • To review sorptive sample-preparation techniques based on polydimethylsiloxane.
  • To highlight the advantages of sorption over adsorption for challenging analytes.
  • To discuss instrumentation and applications, focusing on gas chromatography.

Main Methods:

  • Review of sorptive sample-preparation techniques including open-tubular trapping (OTT), solid-phase microextraction (SPME), gum-phase extraction (GPE), equilibrium gum-phase extraction (EGPE), and stir-bar-sorptive extraction (SBSE).
  • Focus on techniques compatible with thermal desorption and gas chromatography.

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Main Results:

  • Sorption, based on analyte dissolution in a polymeric material, provides a more inert solute retention mechanism compared to adsorption.
  • This method overcomes limitations of adsorptive techniques, particularly for polar and high-molecular-weight compounds.
  • Sorptive techniques show excellent performance with thermal desorption, minimizing artifact formation and improving desorption efficiency.

Conclusions:

  • Sorptive sample preparation offers a superior alternative to adsorption for a wider range of analytes.
  • The technique is particularly effective for polar and high-molecular-weight compounds when coupled with thermal desorption and gas chromatography.
  • This review provides a comprehensive overview of sorption principles, instrumentation, and applications in analytical chemistry.