Promises of a new versatile field-deployable sorbent tube thermodesorber by application to BTEX analysis in CH4
| Autor: | Hervé Carrier, Isabelle Le Hécho, Aurore Lecharlier, Brice Bouyssiere |
|---|---|
| Přispěvatelé: | Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR), TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Gas sample Sorbent tube Thermal desorption-GC-MS Tenax Analytical chemistry Thermal desorption BTEX 010501 environmental sciences Solid-phase microextraction Mass spectrometry 01 natural sciences Analytical Chemistry Trace compound Adsorption [CHIM.GENI]Chemical Sciences/Chemical engineering [CHIM.ANAL]Chemical Sciences/Analytical chemistry 0105 earth and related environmental sciences QD71-142 [SDE.IE]Environmental Sciences/Environmental Engineering 010401 analytical chemistry Tenax TA sorbent tube [SDE.ES]Environmental Sciences/Environmental and Society 0104 chemical sciences Thermal desorption-GC–MS Gas chromatography Preconcentration |
| Zdroj: | Talenta Open Talenta Open, Elsevier, 2021, 4, ⟨10.1016/j.talo.2021.100066⟩ Talenta Open, Elsevier, 2021, 4, pp.100066. ⟨10.1016/j.talo.2021.100066⟩ Talanta Open, Vol 4, Iss, Pp 100066-(2021) |
| ISSN: | 2666-8319 |
| Popis: | International audience; Characterizing trace compounds in gaseous matrices such as natural gas is challenging owing to the low concentrations and the intricate interactions between compounds and matrices present. In contrast to whole gas sampling methods, direct in situ gas sampling with preconcentration of trace compounds on adsorbent tubes followed by thermal desorption and gas chromatography coupled to mass spectrometry (TD-GC-MS) is a powerful method enabling to screen unknown and targeted trace compounds with low detection limits and where moreover sample transfer and associated loss and contamination risks are avoided. Here, a new versatile, field-deployable thermodesorber prototype ('nCx-TD', nCx Instrumentation, Garlin, France) fitted with selfassembled purpose-built Tenax TA adsorbent tubes is presented. Its desorption and GC-injection performances are investigated using a 10 ppm v BTEX in CH 4 synthetic gas and by contrasting the results to those obtained by solid phase microextraction (SPME) and direct injection of the synthetic gas. Unlike most commercial thermodesorbers, the nCx-TD is characterized by a fast "plug" injection without re-focusing trap, leading to high chromatographic peak resolutions. Between the closely eluting ethylbenzene and m-and p-xylene isomers, the Gaussian resolution obtained at a concentration of 10 ppm v with the nCx-TD was 2.9 while that obtained by SPME and direct injection was respectively 1.7 and 1.9. The nCx-TD-obtained peak resolutions increased significantly with the concentration (1 to 10 ppm v) while the SPME-and direct injection resolutions remained at a low constant level across concentrations tested. A real natural gas sample was sampled through the Tenax TA adsorbent tubes and analyzed via TD-GC-MS using the nCx-TD. More than 50 distinct trace compounds were detected, opening exciting perspectives of adsorbent tube multibed configurations and direct in situ field sampling on adsorbent tubes with in situ analysis through the nCx-TD and field-portable GC's. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|