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J Chromatogr A

Title:		A new analytical methodology for a fast evaluation of semi-volatile polycyclic aromatic hydrocarbons in the vapor phase downstream of a diesel engine particulate filter
Author(s):		Portet-Koltalo F; Preterre D; Dionnet F;
Address:		"UMR 6014 COBRA, Universite de Rouen, 55 rue Saint Germain, 27000 Evreux, France. florence.koltalo@univ-rouen.fr"
Journal Title:		J Chromatogr A
Year:		2011
Volume:		20101223
Issue:		7
Page Number:		981 - 989
DOI:		10.1016/j.chroma.2010.12.074
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"A new sampling method was developed to collect vapor-phase polycyclic aromatic compounds (PAHs) downstream of a diesel engine equipped with a diesel particulate filter (DPF). This configuration allowed us to collect separately the particulate phase, which was trapped inside the DPF, and the vapor phase, which was sampled downstream of the DPF. PAHs, which were not predominantly absorbed into the poor organic fraction of the diesel soot, but were rather physically sorbed on high energetic adsorption sites, should be extracted using very drastic extraction conditions Microwave-assisted extraction using solvent mixtures composed of pyridine and diethylamine were used to desorb particulate PAHs, and the total PAH amounts corresponded to a very low value, i.e., 8 mug g(-)(1) or 0.24 mug km(-)(1), with a predominance of low weight PAHs. For collection of the vapor phase, gas bubbling in an aqueous medium was preferred to conventional methods, e.g., trapping on solid sorbents, for several reasons: aqueous trapping allowed us to use a solid phase enrichment process (SPE) that permitted PAH sampling at the sub-picogram levels. Consequently, low volume sampling was possible even if the sampling duration was very short (20 min). Additionally, the amount of time saved for the analysis was considerable when coupling SPE to the analytical system (liquid chromatography with fluorimetric detection). Solvent consumption for the overall sampling and analytical processes was also drastically reduced. Experiments on a diesel engine showed that vapor phase samples collected downstream of the DPF contained all of the 15 target priority PAHs, even the heaviest ones. The total vapor-phase PAH amount was 6.88 mug N m(-)(3) or 10.02 mug km(-)(1), which showed that the gaseous fraction contains more PAHs than the particulate fraction. Partitioning coefficients (K(p)) were estimated showing the predominance in the vapor phase of all the PAHs. However, the DPF technology effects a considerable decrease in the total PAH emission when compared to non-equipped diesel vehicles"
Keywords:		Gas Chromatography-Mass Spectrometry Gases/*chemistry Microwaves Polycyclic Aromatic Hydrocarbons/*analysis Sensitivity and Specificity Solid Phase Extraction Soot Vehicle Emissions/*analysis Volatile Organic Compounds/*analysis;
Notes:		"MedlinePortet-Koltalo, F Preterre, D Dionnet, F eng Research Support, Non-U.S. Gov't Netherlands 2011/01/14 J Chromatogr A. 2011 Feb 18; 1218(7):981-9. doi: 10.1016/j.chroma.2010.12.074. Epub 2010 Dec 23"