FN Archimer Export Format
PT J
TI A GC-SSIM-CRDS System: Coupling a Gas Chromatograph with a Cavity Ring-Down Spectrometer for Onboard Twofold Analysis of Molecular and Isotopic Compositions of Natural Gases during Ocean-Going Research Expeditions
BT 
AF Brandily, Christophe
   LE CUFF, Nolwenn
   DONVAL, Jean-Pierre
   GUYADER, Vivien
   De Prunele, Alexis
   Cathalot, Cecile
   CROGUENNEC, Claire
   Caprais, Jean-Claude
   Ruffine, Livio
AS 1:1;2:2;3:2;4:2;5:2;6:2;7:2;8:1;9:2;
FF 1:PDG-REM-EEP-LEP;2:PDG-REM-GM-LCG;3:PDG-REM-GM-LCG;4:PDG-REM-GM-LCG;5:PDG-REM-GM-LCG;6:PDG-REM-GM-LCG;7:PDG-REM-GM-LGM;8:PDG-REM-EEP-LEP;9:PDG-REM-GM-LCG;
C1 Ifremer, REM/EEP-Laboratoire Environnements Profonds, Centre de Brest, ZI Pointe Du Diable, CS100, F-29280 Plouzané, France
   Ifremer, REM/GM-Laboratoire Cycles Géochimiques et Ressources, Centre de Brest, ZI Pointe Du Diable, CS100, F-29280 Plouzané, France
C2 IFREMER, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-EEP-LEP
   PDG-REM-GM-LCG
   PDG-REM-GM-LGM
IN WOS Ifremer UPR
IF 6.911
TC 1
UR https://archimer.ifremer.fr/doc/00721/83298/88309.pdf
LA English
DT Article
CR MARSITECRUISE
BO Pourquoi pas ?
DE ;Coupled analytical technique;Cavity ring-down spectroscopy;Carbon dioxide;Gas chromatography;Methane;Molecular composition;Natural gases;Onboard analysis;Stable carbon isotope ratio
AB Carbon dioxide (CO2) and methane (CH4) are two climate-sensitive components of gases migrating within sediments and emitted into the water column on continental margins. They are involved in several key biogeochemical processes entering into the global carbon cycle. In order to perform onboard measurements of both the molecular and stable carbon isotope ratios (δ13C) of CH4 and CO2 of natural gases during oceanic cruises, we have developed a novel approach coupling gas chromatography (GC) with cavity ring-down spectroscopy (CRDS). The coupled devices are connected to a small sample isotope module (SSIM) to form a system called GC-SSIM-CRDS. Small volumes of natural gas samples (<1 mL) are injected into the GC using a headspace autosampler or a gas-tight syringe to separate the chemical components using a Shincarbon ST packed column and for molecular quantification by thermal conductivity detection (TCD). Subsequently, CO2 from the sample is trapped in a 7 mL loop at 32 °C before being transferred to the CRDS analyzer for sequential determination of the stable carbon isotope ratios of CH4 and CO2 in 24 min. The loop is an open column (without stationary phase). This approach does not require the use of adsorbents or cooling for the trapping step. Optimization of the separation step prior to analysis was focused on the influence of two key separation factors 1) the flow of the carrier gas and 2) the temperature of the oven. Our analytical system and the measurement protocol were validated on samples collected from gas seeps in the Sea of Marmara (Turkey). Our results show that the GC-SSIM-CRDS system provides a reliable determination of the molecular identification of CH4 and CO2 in complex natural gases, followed by the stable carbon isotope ratios of methane and carbon dioxide. 
PY 2021
PD NOV
SO Analytica Chimica Acta
SN 0003-2670
PU Elsevier BV
VL 1184
UT 000929900500001
DI 10.1016/j.aca.2021.339040
ID 83298
ER

EF