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Probing the aluminum complexation by Siberian riverine organic matter using solid-state DNP-NMR.
- Source :
-
Chemical Geology . Mar2017, Vol. 452, p1-8. 8p. - Publication Year :
- 2017
-
Abstract
- In a Siberian river, the concentrations of chemical species vary with the hydrological regime. Dissolved Organic Matter (DOM) and aluminum ions show a parallel trend in the course of the hydrological year. However, the speciation of aluminum in this natural environment remains an open question. We propose here a combination of spectroscopic techniques to investigate the proximity between the aluminum atoms and DOM. First, one-dimensional (1D) solid-state Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR) and 1D and 2D solution NMR spectra were acquired, providing a clear overview of the DOM composition. Second, the sensitivity enhancement yielded by Dynamic Nuclear Polarization enabled the NMR detection of proximities between the 27 Al and 13 C nuclei. Hence, we show that 8.3 ± 1.3% of the carboxylate groups observed by NMR are connected to the Al 3 + ions in the DOM sample. We here demonstrate for the first time how advanced solid-state NMR methods can provide key information about the localization of aluminum in such complex natural materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00092541
- Volume :
- 452
- Database :
- Academic Search Index
- Journal :
- Chemical Geology
- Publication Type :
- Academic Journal
- Accession number :
- 121356025
- Full Text :
- https://doi.org/10.1016/j.chemgeo.2017.02.004