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Fast method to quantify PAHs in contaminated soils by direct thermodesorption using analytical pyrolysis.

C Biache1, C Lorgeoux2, A Saada3

  • 1Université de Lorraine, LIEC, UMR7360, Vandœuvre-lès-Nancy 54506, France; CNRS, LIEC, UMR7360, Vandœuvre-lès-Nancy 54506, France.

Talanta
|February 19, 2017
PubMed
Summary

A new pyrolysis method (Py-GC-MS/FID) offers a faster, cheaper, and greener way to quantify polycyclic aromatic hydrocarbons (PAHs) in contaminated soils compared to traditional solvent-based techniques.

Keywords:
Accelerated solvent extractionFlame ionization detectionGas chromatographyMass spectrometryPolycyclic aromatic hydrocarbonThermal desorption

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants found in contaminated soils.
  • Accurate quantification of PAHs is crucial for environmental risk assessment.

Purpose of the Study:

  • To develop and validate a novel pyrolysis-based method for PAH quantification.
  • To compare the performance of the new method against a conventional solvent extraction technique.

Main Methods:

  • Development of a pyrolysis method at 450°C coupled with gas chromatography-mass spectrometry/flame ionization detection (Py-GC-MS/FID).
  • Comparison with accelerated solvent extraction followed by GC-MS analyses.
  • Analysis of various contaminated soil samples and a certified reference material (CRM).

Main Results:

  • Good agreement between the pyrolysis method and the conventional method, particularly for the CRM.
  • Reduced variability in soil sample analysis after particle size reduction (<100µm).
  • Py-GC-MS/FID quantified higher levels of low molecular weight (LMW) PAHs.

Conclusions:

  • The pyrolysis-based method is a faster, cost-effective, and environmentally friendly alternative for PAH quantification in soils.
  • Limited sample preparation and absence of solvents contribute to the method's advantages.
  • Potential for slight cracking or LMW PAH loss in conventional methods warrants consideration.