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  • 1
    Language: English
    In: Environmental Chemistry, 2014, Vol.11(6), p.709-718
    Description:  The supramolecular structure and resulting physicochemical properties of soil organic matter (SOM) significantly control storage and buffer functions of soils, e.g. for nutrients, organic molecules and water. Multivalent cations, able to form complexes, are suggested to form inter- and intramolecular cross-links in SOM. At present, specific effects of the valence and type of cation on SOM properties are incompletely understood. We investigated changes in SOM interfacial properties, its ability to release mobile colloids in aqueous solutions and its sorption affinity towards organic chemicals in dependence on cation–SOM interactions, temperature and aging time.
    Keywords: colloids; contact angle; sorption; X-ray photoelectron spectroscopy.
    ISSN: 1448-2517
    E-ISSN: 1449-8979
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  • 2
    Language: English
    In: Plant and Soil, 2018, Vol.427(1), pp.71-86
    Description: Background and aims Nanoparticles and colloids affect the mobilisation and availability of phosphorus for plants and microorganisms in soils. We aimed to give a description of colloid sizes and composition from forest soil profiles and to evaluate the size-related quality of colloids for P fixation. Methods We investigated the size-dependent elemental composition and the P content of water-dispersible colloids (WDC) isolated from five German (beech-dominated) forest soil profiles of varying bulk soil P content by field-flow fractionation (FFF) coupled to various detectors. Results Three size fractions of WDC were separated: (i) nanoparticles 25 nm (NP) rich in C.sub.org, (ii) fine colloids (25 nm-240 nm; FC) composed mainly of C.sub.org, Fe and Al, probably as associations of Fe- and Al- (hydr)oxides and organic matter, and (iii) medium-sized colloids (240 nm-500 nm; MC), rich in Fe, Al and Si, indicating the presence of phyllosilicates. The P concentration in the overall WDC was up to 16 times higher compared to the bulk soil. The NP content decreased with increasing soil depth while the FC and MC showed a local maximum in the mineral topsoil due to soil acidification, although variant distributions in the subsoil were observed. NP were of great relevance for P binding in the organic surface layers, whereas FC- and MC-associated P dominated in the Ah horizon. Conclusion The nanoparticles and colloids appeared to be of high relevance as P carriers in the forest surface soils studied, regardless of the bulk soil P content.
    Keywords: Colloids ; Field-flow fractionation ; Forest soil ; Nanoparticles ; Phosphorus
    ISSN: 0032-079X
    E-ISSN: 1573-5036
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