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

Abstract : A method for polycyclic aromatic hydrocarbon (PAH) quantification, based on pyrolysis at 450 °C combined with gas chromatography coupled with mass spectrometry and flame ionization detection (Py-GC-MS/FID), was developed and compared to a conventional PAH quantification method using accelerated solvent extraction and GC–MS analyses. The PAH contents of three coking plant soils, one gas plant soil, two wood-treating facility soils and one certified reference material (CRM-BCR 524) were determined using both methods. The results obtained with both methods showed a good match, especially in the case of the CRM. The other soil samples presented higher variability which was greatly reduced by crushing the samples to lower particle size (from < 500 to < 100 μm). Higher contents of low molecular weight (LMW) PAHs were quantified with the Py-GC-MS/ FID than with the conventional method, probably because of a slight cracking phenomenon occurring during the pyrolysis and/or a loss of the LMW compounds during the sample concentration required for the conventional method. Because of the limited sample preparation and the fact that no solvent was used, the pyrolysis-based method was proven to be a faster, less expensive and more environmentally friendly than the classical methods for PAH quantification in contaminated soils.
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https://hal.univ-lorraine.fr/hal-01696302
Contributor : Coralie Biache <>
Submitted on : Tuesday, January 30, 2018 - 11:51:43 AM
Last modification on : Wednesday, November 4, 2020 - 1:56:02 PM
Long-term archiving on: : Friday, May 25, 2018 - 5:20:35 PM

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C. Biache, C. Lorgeoux, Alain Saada, Stéfan Colombano, P. Faure. Fast method to quantify PAHs in contaminated soils by direct thermodesorption using analytical pyrolysis. Talanta, Elsevier, 2017, 166, pp.241 - 248. ⟨10.1016/j.talanta.2017.01.055⟩. ⟨hal-01696302⟩

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