Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Pellegrino Conte, Giuseppe Alonzo, Dörte Diehl, Alexander Jaeger, Marko Bertmer, Jörg Bachmann, Gabriele E. Schaumann

Risultato della ricerca: Article

26 Citazioni (Scopus)

Abstract

Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samplesby solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz)and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles.From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large partof cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometryrelaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca.The relation between percentage of mobile water and WaMB water in the context of wettability and 1H NMR relaxationtimes confirms that wettability controls the water film surrounding soil particles. Wettability is controlled byWaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency.Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The resultsdemonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes underfield conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.
Lingua originaleEnglish
pagine (da-a)50-63
Numero di pagine14
RivistaJournal of Hydrology and Hydromechanics
Volume61
Stato di pubblicazionePublished - 2013

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nuclear magnetic resonance
Cations
Protons
cation
Positive ions
Nuclear magnetic resonance
Soils
Water
soil
wettability
water
Wetting
Molecules
Functional groups
functional group
Peat
peat
Biological materials
Ecosystems
Nuclear magnetic resonance spectroscopy

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cita questo

Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils. / Conte, Pellegrino; Alonzo, Giuseppe; Diehl, Dörte; Jaeger, Alexander; Bertmer, Marko; Bachmann, Jörg; Schaumann, Gabriele E.

In: Journal of Hydrology and Hydromechanics, Vol. 61, 2013, pag. 50-63.

Risultato della ricerca: Article

Conte, Pellegrino ; Alonzo, Giuseppe ; Diehl, Dörte ; Jaeger, Alexander ; Bertmer, Marko ; Bachmann, Jörg ; Schaumann, Gabriele E. / Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils. In: Journal of Hydrology and Hydromechanics. 2013 ; Vol. 61. pagg. 50-63.
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abstract = "Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samplesby solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz)and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles.From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large partof cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometryrelaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca.The relation between percentage of mobile water and WaMB water in the context of wettability and 1H NMR relaxationtimes confirms that wettability controls the water film surrounding soil particles. Wettability is controlled byWaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency.Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The resultsdemonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes underfield conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.",
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T1 - Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

AU - Conte, Pellegrino

AU - Alonzo, Giuseppe

AU - Diehl, Dörte

AU - Jaeger, Alexander

AU - Bertmer, Marko

AU - Bachmann, Jörg

AU - Schaumann, Gabriele E.

PY - 2013

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N2 - Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samplesby solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz)and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles.From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large partof cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometryrelaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca.The relation between percentage of mobile water and WaMB water in the context of wettability and 1H NMR relaxationtimes confirms that wettability controls the water film surrounding soil particles. Wettability is controlled byWaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency.Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The resultsdemonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes underfield conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.

AB - Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samplesby solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz)and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles.From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large partof cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometryrelaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca.The relation between percentage of mobile water and WaMB water in the context of wettability and 1H NMR relaxationtimes confirms that wettability controls the water film surrounding soil particles. Wettability is controlled byWaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency.Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The resultsdemonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes underfield conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.

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