Infrared spectroscopy quantification of functional carbon groups in kerogens and coals: A calibration procedure

• Main Authors: Phan, Van T.H., Quirico, Eric, Beck, Pierre, Le Brech, Yann, Jovanovic, Lora, Le Guillou, Corentin, Bernard, Sylvain, Bonal, Lydie, Carrasco, Nathalie, Gautier, Thomas, Raya, Jesus
• Other Authors: Université de Lille, CNRS, INRA, ENSCL, Institut de Planétologie et d'Astrophysique de Grenoble IPAG, Unité Matériaux et Transformations (UMET) - UMR 8207, Laboratoire Réactions et Génie des Procédés LRGP, PLANETO - LATMOS, Institut de minéralogie, de physique des matériaux et de cosmochimie IMPMC, Institut de Chimie de Strasbourg
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier BV 2021
• Subjects: Tagish
• Online Access: https://hdl.handle.net/20.500.12210/57869

The determination of the abundances of the CHx, C = O and aromatic groups in chondritic Insoluble Organic Matter (IOM) and coals by Infrared (IR) spectroscopy is a challenging issue due to insufficient knowledge on the absorption cross-sections and their sensitivity to the molecular environment. Here, we report a calibration approach based on a 13C synthetic model material whose composition was unambiguously determined by Direct-Pulse/Magic Angle Spinning Nuclear Magnetic Resonance (DP/MAS NMR). Ratios of the cross-sections of the CHx, C = O and aromatic groups have been determined, and the method has been applied to IOM samples extracted from four chondrites as Orgueil (CI), Murchison (CM), Tagish Lake (C2-ungrouped) and EET 92042 (CR2), and to a series of coals. The estimate of the aliphatic to aromatic carbon ratio (nCHx/nAro) in IOM samples from Orgueil, Murchison and Tagish Lake chondrites is in good agreement with Single-Pulse/NMR estimates earlier published, and is lower by a factor of 1.3 in the case of the CR chondrite EET 92042 (but the error bars overlap). In contrast, the aliphatic to carbonyl ratio (nCHx/nC=O) is overestimated for the four chondrites. These discrepancies are likely due to the control of the absorption cross-section of the C = O and C = C bonds by the local molecular environment. Regarding coals, the use of published NMR analyses has brought to light that the integrated cross-section ratio ACHx/AAro varies with the vitrinite reflectance over an order of magnitude. Here as well, the local oxygen speciation plays a critical control in AAro, which decreases with increasing the vitrinite reflectance. We provide an analytical law that links ACHx/AAro and vitrinite reflectance, which will allow the determination of nCHx/nAro for any coal sample, provided its vitrinite reflectance is known. 259;