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

Wagai, Rota; Mayer, Lawrence M.; Kitayama, Kanehiro

doi:10.1016/j.geoderma.2008.11.032

Cited by 78 publications

(75 citation statements)

References 45 publications

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“…The measured carbon content in combination with the phosphate loading C PO4 determined experimentally with the probe ion method leads to an estimation of the C NOM , which then can be applied in the CD model for application to field samples. This increase of surface coverage of NOM with the organic carbon content is in line with recent results found by studying the energetics of N 2 gas adsorption in soils (Wagai et al, 2009).…”

Section: Epiloguesupporting

confidence: 91%

Nanoparticles in natural systems II: The natural oxide fraction at interaction with natural organic matter and phosphate

Hiemstra

Antelo

Rotterdam

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Epiloguesupporting

confidence: 91%

Nanoparticles in natural systems II: The natural oxide fraction at interaction with natural organic matter and phosphate

Hiemstra

Antelo

Rotterdam

et al. 2010

Geochimica et Cosmochimica Acta

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“…This results in an SSA increase of 50% for goethite and an SSA decrease of 80% for ferrihydrite (Clausen and Fabricius, 2000). Low-temperature chemical oxidation processes of OM were thus proposed (Kaiser and Guggenberger, 2003;Kahle et al, 2003;Wagai et al, 2009) for the removal of OM. Results of low-temperature chemical oxidation and thermal oxidation on mineral SSA for similar soils have been discussed (Wagai et al, 2009;Sequaris et al, 2010).…”

Section: N 2 Gas-adsorption Experimentsmentioning

confidence: 99%

“…Low-temperature chemical oxidation processes of OM were thus proposed (Kaiser and Guggenberger, 2003;Kahle et al, 2003;Wagai et al, 2009) for the removal of OM. Results of low-temperature chemical oxidation and thermal oxidation on mineral SSA for similar soils have been discussed (Wagai et al, 2009;Sequaris et al, 2010). It was found that the lower efficiency of low-temperature chemical oxidation for total OM removal mainly limits the comparison of SSA (Wagai et al, 2009).…”

Section: N 2 Gas-adsorption Experimentsmentioning

confidence: 99%

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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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“…The BET surface of natural ferrihydrites (Schwertmann and Fischer, 1973) as well as synthetic oxides (Eusterhues et al, 2003;Kaiser and Guggenberger, 2000;Mö dl et al, 2007) are negatively correlated with the NOM content. To reduce this effect, one may try to remove the organic matter (Kaiser and Guggenberger, 2003;Mayer, 1994;Wagai et al, 2009). In addition, one may remove the oxide fraction(s) and estimate from the difference the contribution(s) (Eusterhues et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles in natural systems I: The effective reactive surface area of the natural oxide fraction in field samples

Hiemstra

Antelo

Rahnemaie

et al. 2010

Geochimica et Cosmochimica Acta

145

185

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

Cited by 78 publications

References 45 publications

Nanoparticles in natural systems II: The natural oxide fraction at interaction with natural organic matter and phosphate

Nanoparticles in natural systems II: The natural oxide fraction at interaction with natural organic matter and phosphate

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

Nanoparticles in natural systems I: The effective reactive surface area of the natural oxide fraction in field samples

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