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Related Experiment Videos

Troubleshooting with cell blanks in PLE extraction.

V Fernández-González1, G Grueiro-Noche, E Concha-Graña

  • 1Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, 15071, A Coruña, Spain.

Analytical and Bioanalytical Chemistry
|September 1, 2005
PubMed
Summary
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Pressurized liquid extraction (PLE) of empty cells can introduce interfering phthalates and silicones. A pre-extraction step of the empty cell is recommended to avoid contamination in trace analysis of persistent organic pollutants.

Area of Science:

  • Analytical Chemistry
  • Environmental Chemistry

Background:

  • Pressurized liquid extraction (PLE) is a common technique for analyzing persistent organic pollutants (POPs).
  • Analysis of trace levels of POPs, including polycyclic aromatic hydrocarbons, aliphatic hydrocarbons, and organochlorine pesticides, requires high-purity extracts.
  • Interfering compounds from extraction equipment can compromise the accuracy of trace analysis.

Purpose of the Study:

  • To identify interfering compounds present in blank extracts from pressurized liquid extraction.
  • To determine the source of these interfering compounds.
  • To propose a solution for mitigating contamination in trace POP analysis.

Main Methods:

  • Analysis of blank extracts from an 11 mL empty cell using pressurized liquid extraction (PLE).

Related Experiment Videos

  • Gas chromatography with flame ionization detection (GC-FID) and gas chromatography with an electron capture detector (GC-ECD) were employed for analysis.
  • Identification of interfering compounds and their sources.

    • Main Results:

    • Blank extracts contained significant interfering peaks, complicating trace analysis.
    • Interfering compounds were identified as phthalates, silicones, and organic acids.
    • The source of these contaminants was traced to the empty extraction cell.

    Conclusions:

    • Contamination from empty extraction cells can significantly impact trace analysis of persistent organic pollutants.
    • A preliminary extraction step of the empty cell under optimized conditions is a viable solution to remove interfering compounds.
    • Implementing this pre-extraction step ensures cleaner extracts for accurate POP analysis.