| Title: | Aldehydes gas ozonation monitoring: Interest of SIFT/MS versus GC/FID |
| Author(s): | Vitola Pasetto L; Simon V; Richard R; Pic JS; Violleau F; Manero MH; |
| Address: | "Laboratoire de Genie Chimique, Universite de Toulouse, CNRS, INPT, UPS, Toulouse, France; Laboratoire de Chimie Agro-industrielle, LCA, Universite de Toulouse, INRA, INPT-ENSIACET, Toulouse, France. Laboratoire de Chimie Agro-industrielle, LCA, Universite de Toulouse, INRA, INPT-ENSIACET, Toulouse, France. Laboratoire de Genie Chimique, Universite de Toulouse, CNRS, INPT, UPS, Toulouse, France. Laboratoire d'Ingenierie des Systemes Biologiques et des Procedes, Universite de Toulouse, CNRS, INRA, INSA, Toulouse, France. Laboratoire de Chimie Agro-industrielle, LCA, Universite de Toulouse, INRA, INPT-ENSIACET, Toulouse, France. Electronic address: frederic.violleau@purpan.fr" |
| DOI: | 10.1016/j.chemosphere.2019.06.186 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Two analytical techniques - online Gas Chromatography coupled with Flame Ionization Detector (often used method for VOCs monitoring) versus Selected Ion Flow Tube coupled with Mass Spectrometry (a more recent technique based on direct mass spectrometry) - were compared in association to an ozone-based gas treatment. Selecting aldehydes as the representative VOCs, their concentrations were monitored during ozonation experiments by both techniques in parallel. Contradictory results were obtained in the presence of ozone. Aldehydes were up to 90% removed due to a reaction with ozone according to GC/FID analysis, whereas with SIFT/MS, aldehydes concentration remained at the same level during the experiments regardless of the ozone presence. In addition, it was demonstrated that the apparent aldehydes removal was affected by GC injector temperature, varying from 90% (when it was at 250?ª+ degrees C) to 60% (at 100?ª+ degrees C). Meanwhile, even when the ozonation reactor was heated to 100?ª+ degrees C, no aldehydes conversion was evidenced by SIFT/MS, suggesting that the GC injector temperature was not the only interference-causing parameter. The ozone-aldehyde reaction is probably catalyzed by some material of GC injector and/or column. An ozone-GC interference was therefore confirmed, making unsuitable the use of GC/FID with silicone stationary phase to monitor aldehydes in presence of high concentrations of ozone (at least 50 ppmv). On the other hand, SIFT/MS was validated as a reliable technique, which can be employed in order to measure VOCs concentrations in ozonation processes" |
| Keywords: | Aldehydes/*analysis/chemistry Flame Ionization/*methods Gas Chromatography-Mass Spectrometry/*methods Mass Spectrometry/methods Ozone/*chemistry Reproducibility of Results Volatile Organic Compounds/analysis/chemistry Aldehydes Gc/fid Gas treatment Ozone; |
| Notes: | "MedlineVitola Pasetto, Leticia Simon, Valerie Richard, Romain Pic, Jean-Stephane Violleau, Frederic Manero, Marie-Helene eng England 2019/09/29 Chemosphere. 2019 Nov; 235:1107-1115. doi: 10.1016/j.chemosphere.2019.06.186. Epub 2019 Jun 25" |
