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

TALANTA

卷:166

Article

Biache, C.^1,2  Lorgeoux, C.³  Saada, A.⁴  Colombano, S.⁴  Faure, P.^1,2 

[1] Univ Lorraine, LIEC, UMR 7360, F-54506 Vandoeuvre Les Nancy, France

[2] LIEC, CNRS, UMR 7360, F-54506 Vandoeuvre Les Nancy, France

[3] Univ Lorraine, CNRS, CREGU, GeoRessources Lab,UMR7359, F-54506 Vandoeuvre Les Nancy, France

[4] Bur Rech Geol & Minieres, 3 Ave Claude Guillemin,BP 36009, F-45060 Orleans 2, France

关键词: Thermal desorption;    Gas chromatography;    Mass spectrometry;    Flame ionization detection;    Accelerated solvent extraction;    Polycyclic aromatic hydrocarbon;   

DOI  :  10.1016/j.talanta.2017.01.055

来源: Elsevier

【 摘 要 】

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 mu m). 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.

【 授权许可】

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