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024 7 _ |2 DOI
|a 10.2136/vzj2008.0030
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|a WOS:000268871900020
037 _ _ |a PreJuSER-5532
041 _ _ |a eng
082 _ _ |a 550
084 _ _ |2 WoS
|a Environmental Sciences
084 _ _ |2 WoS
|a Soil Science
084 _ _ |2 WoS
|a Water Resources
100 1 _ |0 P:(DE-Juel1)VDB1270
|a Pohlmeier, A.
|b 0
|u FZJ
245 _ _ |a A Fast Field Cycling Nuclear Magnetic Resonance Relaxometry Study of Natural Soils
260 _ _ |a Madison, Wis.
|b SSSA
|c 2009
300 _ _ |a 735 - 742
336 7 _ |a Journal Article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a article
|2 DRIVER
440 _ 0 |0 10301
|a Vadose Zone Journal
|v 8
|x 1539-1663
|y 3
500 _ _ |a The authors thank the German research fund (DFG) for financial support (Sta 511/4- 1, PO 746/2-1, and Transregio/SFB32), F. Pauly and U. Lesten (ZAT, Research Center Julich) for the recording CT images, C. Walraf (ICG-4, Research Center Julich) for the BET measurements, and J. Koestel and A.-P. Schmidt-Eisenlohr (ICG4, Research Center Julich) 360 for the water retention curves of the soils.
520 _ _ |a This study used nuclear magnetic resonance (NMR) relaxometry at different Larmor frequencies to investigate water dynamics in the pore space of natural porous media. Spin-lattice NMR relaxation times (T-1) were determined in purified fine sand and two natural soils, Kaldenkirchen sandy loam and Merzenhausen silt loam, by means of fast field This technique investigates relaxation processes as a function of the Larmor frequency. in the 0.005 and 20 MHz, yielding so-called relaxation dispersion curves (1/T-1 vs. log.). The data were further by means of inverse Laplace transformation to calculate the T-1 relaxation time distribution functions. Only sand was characterized by monomodal distribution with T-1 of about 1 s at 20 MHz, whereas the natural soil showed multi modal distribution functions in the range between 2 and 70 ms. With decreasing Larmor frequency, all distribution functions kept their shapes but were shifted to faster relaxation times. The corresponding relaxation dispersion curves indicate predominance of two-dimensional diffusion of water in the soils, whereas in the sand, diffusion behaved like unrestricted three-dimensional diffusion. In terms of the Brownstein-Tarr model, in the T-1 relaxation times with increasing silt and clay content can be explained by an increase of the volume ratios (S/V) of these porous media, i.e., by a decrease in the pore sizes. Finally, distribution functions of size parameter V/S were obtained from the spin-lattice relaxation time distributions by normalizing on the specific surface area. They ranged from submicrometers in the Merzenhausen soil to micrometers and submillimeters in soil and fine sand, respectively.
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700 1 _ |0 P:(DE-Juel1)VDB12272
|a Haber-Pohlmeier, S.
|b 1
|u FZJ
700 1 _ |0 P:(DE-HGF)0
|a Stapf, S.
|b 2
773 _ _ |0 PERI:(DE-600)2088189-7
|a 10.2136/vzj2008.0030
|g Vol. 8, p. 735 - 742
|p 735 - 742
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|t Vadose zone journal
|v 8
|x 1539-1663
|y 2009
856 7 _ |u http://dx.doi.org/10.2136/vzj2008.0030
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|a JCR/ISI refereed
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|d 31.10.2010
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