Soil–Water Interactions
作者： Gabriele E. Schaumann , Marko Bertmer
DOI: 10.1002/9780470034590.EMRSTM1343
关键词: Properties of water 、 Wetting 、 Proton NMR 、 Supramolecular chemistry 、 Organic matter 、 Soil organic matter 、 Soil water 、 Chemical engineering 、 Analytical chemistry 、 Relaxometry 、 Chemistry
摘要: Proton NMR wideline spectroscopy and low-field relaxometry are versatile nondisturbing tools for investigating soil–water interactions. Relaxometry allows studying the properties of water, redistribution within pore system (wetting), size distribution, its time-dependent changes (swelling). Two-dimensional (2-D) correlations between transversal longitudinal relaxation times diffusion coefficients extend our knowledge by features molecular mobility interconnectivity pores, entrapment in gel phases. Combination with structural liquid water affecting freezing-melting behavior obtained thermal analysis, this insight to identify phases organic matter understand role highly swellable substances [such as extracellular polymeric (EPS) mucilage] soil structure, rhizosphere functions, aggregate properties. interactions (SOM) segments on a microscopic scale. Mobility proton-containing material is directly reflected linewidth these cases. Combining two methods using information from characterization matrix rigidity, supramolecular presence molecule bridges (WaMB) obtained. This method thus optimal study labile structures SOM matrix. Keywords: soil–water interactions; swelling; wetting; pore distribution; NMR relaxometry; wideline NMR; supramolecular structure; water
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