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Non‐disturbing characterization of natural organic matter (NOM) contained in clay rock pore water by mass spectrometry using electrospray and atmospheric pressure chemical ionization modes
Authors:Sandrine Huclier‐Markai  Catherine Landesman  Hélène Rogniaux  Fabrice Monteau  Agnes Vinsot  Bernd Grambow
Institution:1. SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS‐IN2P3, 4 rue A. Kastler, BP 20722, F‐44307 Nantes Cedex 03, France;2. UR1268 Biopolymères Interactions Assemblages, Plate‐Forme BIBS, INRA, Rue de la Geraudiere BP 71627, F‐44316 Nantes Cedex 3, France;3. Laboratoire LABERCA, Ecole Nationale Vétérinaire Nantes, Atlanp?le La Chantrerie, BP 50707, F‐44307 Nantes Cedex 3, France;4. ANDRA, Laboratoire de recherche souterrain de Meuse/Haute Marne, RD 960, F‐55290 Bure, France
Abstract:We have investigated the composition of the mobile natural organic matter (NOM) present in Callovo‐Oxfodian pore water using electrospray ionization mass spectrometry (ESI‐MS), atmospheric pressure chemical ionization mass spectrometry (APCI‐MS) and emission‐excitation matrix (EEM) spectroscopy. The generation of knowledge of the composition, structure and size of mobile NOM is necessary if one wants to understand the interactions of these compounds with heavy metals/radionuclides, in the context of environmental studies, and particularly how the mobility of these trace elements is affected by mobile NOM. The proposed methodology is very sensitive in unambiguously identifying the in situ composition of dissolved NOM in water even at very low NOM concentration, due to innovative non‐disturbing water sampling and ionization (ESI/APCI‐MS) techniques. It was possible to analyze a quite exhaustive inventory of the small organic compounds of clay pore water without proceeding to any chemical treatment at naturally occurring concentration levels. The structural features observed were mainly acidic compounds and fatty acids as well as aldehydes and amino acids. Copyright © 2009 John Wiley & Sons, Ltd.
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