A Fast Field Cycling Nuclear Magnetic Resonance Relaxometry Study of Natural Soils

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Title:Main Title: A Fast Field Cycling Nuclear Magnetic Resonance Relaxometry Study of Natural Soils
Description:Abstract: 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 cycling relaxometry. This technique investigates relaxation processes as a function of the Larmor frequency ν in the range between 0.005 and 20 MHz, yielding so-called relaxation dispersion curves (1/T 1 vs. log ν). The data were further analyzed by means of inverse Laplace transformation to calculate the T1 relaxation time distribution functions. Only the fine sand was characterized by monomodal distribution with T 1 of about 1 s at 20 MHz, whereas the natural soil samples showed multimodal 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 macroporous sand, diffusion behaved like unrestricted three-dimensional diffusion. In terms of the Brownstein–Tarr model, the decrease in the T 1 relaxation times with increasing silt and clay content can be explained by an increase of the surface/volume ratios (S/V) of these porous media, i.e., by a decrease in the pore sizes. Finally, distribution functions of the pore 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 the Kaldenkirchen soil and fine sand, respectively.
Identifier:10.2136/vzj2008.0030 (DOI)
Responsible Party
Creators:Andreas Pohlmeier (Author), Sabina Haber-Pohlmeier (Author), Siegfried Stapf (Author)
Publisher:Soil Science Society of America
Publication Year:2013
Topic
TR32 Topic:Soil
Related Subproject:A1
Subjects:Keywords: NMR, Soil, Soil Water Content
File Details
Filename:2009_Pohlmeier_VZJ.pdf
Data Type:Text - Article
Size:8 Pages
File Size:1.4 MB
Date:Issued: 01.08.2009
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:[TR32DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Vadose Zone Journal
Source Website:www.soils.org
Issue:3
Volume:8
Number of Pages:8 (735 - 742)
Metadata Details
Metadata Creator:Markus Küppers
Metadata Created:02.12.2013
Metadata Last Updated:02.12.2013
Subproject:A1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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