2H NMR study of dynamics of benzene-d6 interacting with humic and fulvic acids

The Journal of Physical Chemistry. a
Margaret A EastmanM A Nanny

Abstract

Samples of three humic acids and one fulvic acid with 1% loading of benzene-d(6) in sealed glass tubes have been studied with solid-state deuterium quadrupole-echo nuclear magnetic resonance spectroscopy. Calculated spectra combining three motional models, two isotropic models and a third more restricted small-angle wobble (SAW) motional model, are fit to the experimental spectra. One isotropic motion (ISO(v)) is assigned to vaporous benzene-d(6) due to the small line width, short T(1), and the loss of this component by about -25 °C when the temperature is lowered. The remaining two motional components, ISO(s) and SAW, are sorbed by the humic or fulvic acid. Benzene-d(6) slowly interacts with the humic substances, progressively filling SAW sites as ISO(s) motion diminishes. Both the sorption and increase in percentage of SAW motion are for the most part complete within 200 days but continue to a lesser extent over a period of a few years. For the SAW motion there are at least two and most likely a series of T(1) values, indicating more than one adsorption environment. Enthalpies of sorption, obtained from application of the van't Hoff equation to the percentages of the different motional models derived from a series of variable...Continue Reading

References

Aug 1, 1995·Solid State Nuclear Magnetic Resonance·O Weintraub, S Vega
May 16, 2001·Environmental Science & Technology·G Xia, J J Pignatello
May 25, 2002·Environmental Science & Technology·Myrna J SalloumPatrick G Hatcher
Oct 26, 2005·Environmental Science & Technology·Michael Sander, Joseph J Pignatello
Dec 31, 2005·Environmental Science & Technology·Rebecca Sutton, Garrison Sposito
Sep 27, 2006·Environmental Science & Technology·Christian NiedererRené P Schwarzenbach
Nov 28, 2006·Journal of Magnetic Resonance·Margaret A Eastman, Mark A Nanny
Jan 12, 2007·Physical Chemistry Chemical Physics : PCCP·Anu M KantolaJukka Jokisaari
Apr 17, 2009·Environmental Science & Technology·Benny Chefetz, Baoshan Xing
Jul 29, 2010·Physical Chemistry Chemical Physics : PCCP·Carlos F R A C LimaLuís M N B F Santos

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