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| Titel |
Use of fast field cycling NMR for the evaluation of the interactions between natural organic matter and clay minerals |
| VerfasserIn |
Pellegrino Conte, Cristina Abbate, Andrea Baglieri, Giuseppe Alonzo, Claudio De Pasquale, Michéle Nègre, Mara Gennari |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034151
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| Zusammenfassung |
| Natural organic matter (NOM) is a very important soil and water constituent due to its role in binding organic and inorganic pollutants, thereby affecting their fate in the environmental compartments. Prediction of NOM physical-chemical properties can be efficaciously achieved by studying its structure and three dimensional conformation. Many techniques can be used to this aim. Among others, fast field cycling nuclear magnetic resonance relaxometry (FFC-NMR) appears very suitable due to its ability in monitoring NOM conformational behaviour at very low magnetic fields. The present study aims to the evaluation by FFC-NMR relaxometry of the interactions between a dissolved humic material and two clay minerals. In particular, FFC-NMR showed that either kaolinite or montmorrillonite adsorb part of the organic material. Absorption degree is proportional to the surface area of the two clay minerals, while the adsorbed fraction resulted the most polar part of dissolved organic matter due to the disappearing of the components relaxing at the longest longitudinal relaxation times. This study showed that FFC-NMR is more sensitive than high field NMR spectroscopy in monitoring the conformational changes occurring during the interactions between natural organic matter and clay minerals.
Acknowledgements
This work was partially funded by Ce.R.T.A. s.c.r.l. (Centri Regionali per le Tecnologie Alimentari; http://www.certa.it/default.asp). |
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