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000150842 037__ $$aFZJ-2014-00881
000150842 041__ $$aEnglish
000150842 1001_ $$0P:(DE-Juel1)143709$$aDuschl, Markus$$b0$$eCorresponding author$$ufzj
000150842 1112_ $$aEuropean Geosciences Union General Assembly 2013$$cVienna$$d2013-04-07 - 2013-04-12$$gEGU$$wAustria
000150842 245__ $$aNuclear magnetic resonance relaxation and diffusion measurements as a proxy for soil properties
000150842 260__ $$c2013
000150842 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1391000400_27174$$xAfter Call
000150842 3367_ $$033$$2EndNote$$aConference Paper
000150842 3367_ $$2DataCite$$aOther
000150842 3367_ $$2ORCID$$aLECTURE_SPEECH
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000150842 3367_ $$2BibTeX$$aINPROCEEDINGS
000150842 520__ $$aNuclear Magnetic Resonance (NMR) relaxation and NMR diffusion measurements are two of a series of fast and non-invasive NMR applications widely used e.g. as well logging tools in petroleum exploration [1]. For experiments with water, NMR relaxation measures the relaxation behaviour of former excited water molecules, and NMR diffusion evaluates the self-diffusion of water. Applied in porous media, both relaxation and diffusion measurements depend on intrinsic properties of the media like pore size distribution, connectivity and tortuosity of the pores, and water saturation [2, 3]. Thus, NMR can be used to characterise the pore space of porous media not only in consolidated sediments but also in soil.
The physical principle behind is the relaxation of water molecules in an external magnetic field after excitation. In porous media water molecules in a surface layer of the pores relax faster than the molecules in bulk water because of interactions with the pore wall. Thus, the relaxation in smaller pores is generally faster than in bigger pores resulting in a relaxation time distribution for porous media with a range of pore sizes like soil [4]. In NMR diffusion experiments, there is an additional encoding of water molecules by application of a magnetic field gradient. Subsequent storage of the magnetization and decoding enables the determination of the mean square displacement and therefore of the self-diffusion of the water molecules [5]. Employing various relaxation and diffusion experiments, we get a measure of the surface to volume ratio of the pores and the tortuosity of the media.
In this work, we show the characterisation of a set of sand and soil samples covering a wide range of textural classes by NMR methods. Relaxation times were monitored by the Carr-Purcell-Meiboom-Gill sequence and analysed using inverse Laplace transformation. Apparent self-diffusion constants were detected by a 13-intervall pulse sequence and variation of the storage time. We correlated the results with various soil properties like texture, water retention parameters, and hydraulic conductivity.  This way we show that we can predict soil properties by NMR measurements and that we are able use results of NMR measurements as a proxy without the need of direct measurements.
000150842 536__ $$0G:(DE-HGF)POF2-246$$a246 - Modelling and Monitoring Terrestrial Systems: Methods and Technologies (POF2-246)$$cPOF2-246$$fPOF II$$x0
000150842 536__ $$0G:(DE-Juel1)BMBF-0315532A$$aBMBF-0315532A - CROP.SENSe.net (BMBF-0315532A)$$cBMBF-0315532A$$x1
000150842 7001_ $$0P:(DE-Juel1)129521$$aPohlmeier, Andreas$$b1$$ufzj
000150842 7001_ $$0P:(DE-HGF)0$$aBrox, Tim$$b2
000150842 7001_ $$0P:(DE-HGF)0$$aGalvosas, Petrik$$b3
000150842 7001_ $$0P:(DE-Juel1)129549$$aVereecken, Harry$$b4$$ufzj
000150842 909CO $$ooai:juser.fz-juelich.de:150842$$pVDB
000150842 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)143709$$aForschungszentrum Jülich GmbH$$b0$$kFZJ
000150842 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)129521$$aForschungszentrum Jülich GmbH$$b1$$kFZJ
000150842 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)129549$$aForschungszentrum Jülich GmbH$$b4$$kFZJ
000150842 9131_ $$0G:(DE-HGF)POF2-246$$1G:(DE-HGF)POF2-240$$2G:(DE-HGF)POF2-200$$3G:(DE-HGF)POF2$$4G:(DE-HGF)POF$$aDE-HGF$$bErde und Umwelt$$lTerrestrische Umwelt$$vModelling and Monitoring Terrestrial Systems: Methods and Technologies$$x0
000150842 9141_ $$y2013
000150842 920__ $$lyes
000150842 9201_ $$0I:(DE-Juel1)IBG-3-20101118$$kIBG-3$$lAgrosphäre$$x0
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