Soil micro- and mesopores studied by N2 adsorption and 129Xe NMR of adsorbed xenon

Filimonova, S. V.; Knicker, Heike; Kögel‐Knabner, Ingrid

doi:10.1016/j.geoderma.2005.01.018

Cited by 32 publications

(20 citation statements)

References 30 publications

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“…Besides the surface area also porosity determines the capacity of the mineral phase to adsorb and preserve OM from oxidation (Kaiser and Guggenberger, 2003;Mayer et al, 2004). As Fe and Al oxyhydroxides exhibit significant microporosity (Torrent et al, 1992;Filimonova et al, 2006), differences in the developing porous network with increasing soil age may be responsible for the increasing amounts of H 2 O 2 -resistant OC.…”

Section: Evolution Of Mineral Surface Area and Organic Coverage Of CLmentioning

confidence: 99%

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Dümig

Häusler

Steffens

et al. 2012

Geochimica et Cosmochimica Acta

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Section: Evolution Of Mineral Surface Area and Organic Coverage Of CLmentioning

confidence: 99%

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Dümig

Häusler

Steffens

et al. 2012

Geochimica et Cosmochimica Acta

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“…The soluble minerals in the DCB extraction method were identified as the main microporous phases in soil. Filimonova et al (Filimonova et al, 2006) demonstrated that the removal of iron oxides by DCB treatment decreases the SSA by up to 50%. In their study, the micropores completely vanished in two German luvisol and gleysol soils.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal oxide on surface area and pore size of water-dispersible colloids from three German silt loam topsoils

et al. 2014

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Abstract:The surface area and pore structure of easily dispersed soil particles < 2 µm in size (water-dispersible colloids, WDCs) are important for carbon sequestration and transport in soil. Two processes are essential for the terrestrial carbon cycling. In this work, we determine the effects of dithionite-citrate-bicarbonate (DCB) extractable metal oxides, and oxalate extractable metal oxides on the specific surface area (SSA) and pore structure of WDCs from silt loam topsoils of three TERENO test sites with a similar clay content (20%) in Germany (arable (Selhausen), grassland (Rollesbroich) and forest (Wuestebach) soils). The N 2 gasadsorption (−196°C), small-angle X-ray scattering (SAXS), dynamic light scattering (DLS) and microelectrophoretic (ME) methods were used and compared. Results show that 1) the SSA of the WDCs from Selhausen, Rollesbroich, and Wuestebach decreased more after DCB treatment (27%, 35%, and 44%) than after oxalate treatment (5%, 14%, and 22%). DCB removed metal oxide nanoparticles from WDCs were found to have diameters (d p ) ranging from 4 nm to 8 nm and the surface loading ratios on the surface of aluminosilicate residues in WDCs were estimated to be 11% to 22% for three soils where the highest value was found in the acidic forest soil. 2) Pore sizes in the mesopore range (2 nm to 50 nm) were analyzed in the WDC fractions. The results were discussed in terms of accessible open pores for the pristine WDCs and WDC samples from which metal oxide nanoparticles and organic carbon (OC) had been removed. The lower average pore radius (R p ) measured by the N 2 gasadsorption method based on the total volume (V t ) to SSA ratio variations in WDCs without metal oxides compared to WDC with metal oxides indicated a contraction of the porous structure of WDCs due to the presence of metal oxide nanoparticles. The pore size distribution (PSD) analysis showed a sensitive contribution of metal oxide nanoparticles in the low range of pore sizes (< 25 nm) of WDCs. In SAXS measurements, higher surface fractal dimensions (D s ) were observed in WDCs before the metal oxides removal, which supports a roughness increase of the interfaces in the presence of nanoparticles. The colloidal characterization of WDCs by the DLS and ME methods shows, at a µm scale, the role of positively charged metal oxide nanoparticles in forming WDCs with a more compact structure by decreasing the particle size (d z ) and the negative zeta potential (ζ).3) The comparison of R p , k, d z and d p results between different soils also indicates the dependence on the clay mineralogy of WDCs so that the heterocoagulation between kaolinite and illite (clay minerals of different aspect ratios) increases the size of soil mesopores (Rollesbroich). In conclusion, the results of this study clearly show that the combination of the N 2 gas-adsorption, SAXS, DLS and ME methods allows the characterization of soil porosity in the nanometer range where metal oxide nanoparticles contribute to a more compact structure of WDC.

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“…This approach fails, however, as a quantitative measure of surface composition in some soils because of the presence of micropores (b2 nm diameter) that are often associated with iron and aluminum hydrous oxides (e.g., Mödl et al, 2007). Soil minerals with high microporosity have higher C-constant values compared to the soil minerals without them (Mayer and Xing, 2001) and the micropores are preferentially covered with OM compared to other parts of mineral surfaces in sorption experiments (Kaiser and Guggenberger, 2003;Mikutta et al, 2004;Filimonova et al, 2006). In addition, removal of OM by wet or dry oxidation treatments causes alteration and destruction of the micropores, reducing both SSA and C-constant (Mayer and Xing, 2001;Kaiser and Guggenberger, 2003;Filimonova et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Soil minerals with high microporosity have higher C-constant values compared to the soil minerals without them (Mayer and Xing, 2001) and the micropores are preferentially covered with OM compared to other parts of mineral surfaces in sorption experiments (Kaiser and Guggenberger, 2003;Mikutta et al, 2004;Filimonova et al, 2006). In addition, removal of OM by wet or dry oxidation treatments causes alteration and destruction of the micropores, reducing both SSA and C-constant (Mayer and Xing, 2001;Kaiser and Guggenberger, 2003;Filimonova et al, 2006). Nevertheless, a soil with full organic coverage of mineral surfaces can still be identified via a low C-constant of the untreated soil sample (i.e.…”

Section: Introductionmentioning

confidence: 99%

Extent and nature of organic coverage of soil mineral surfaces assessed by a gas sorption approach

2009

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Soil micro- and mesopores studied by N2 adsorption and 129Xe NMR of adsorbed xenon

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Cited by 32 publications

References 30 publications

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Effect of metal oxide on surface area and pore size of water-dispersible colloids from three German silt loam topsoils

Extent and nature of organic coverage of soil mineral surfaces assessed by a gas sorption approach

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