Thermal Analysis of Whole Soils and Sediment

Delapp, Rossane; LeBoeuf, Eugene J.

doi:10.2134/jeq2004.3300

Cited by 36 publications

(32 citation statements)

References 48 publications

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“…TMA has been applied to study glass transition behaviour in NOM fractions and organic whole soils and sediments (Young and LeBoeuf 2000;DeLapp and LeBoeuf 2004;. The potential of TMA for granular and heterogeneous soil material is, however, imparted by sample consistency.…”

Section: Introductionmentioning

confidence: 99%

Potential of AFM–nanothermal analysis to study the microscale thermal characteristics in soils and natural organic matter (NOM)

Schaumann

Mouvenchery

2011

J Soils Sediments

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Purpose This exploratory study evaluates the potential of nanothermal analysis (nTA) coupled with atomic force microscopy (AFM) of soil samples for understanding physicochemical processes in soil and for linking the nanospatial and microspatial distribution of thermal characteristics with the macroscopic properties of soil samples. Materials and methods Soil and reference samples were investigated by differential scanning calorimetry and AFMnTA. nTA was conducted on 16 points of each AFM image in two subsequent heating cycles (55-120°C and 55-300°C, respectively). Thermograms were subdivided into characteristic types and their spatial distribution was compared between sample replicates and materials. Results and discussion Thermogram types consisted of partly structured expansion and compression phases, suggesting material-specific thermal profiles. The distribution of thermogram types reflected sample-dependent nanoscale and microscale heterogeneity. Indications for water molecule bridge transitions were found by nTA in peat and soil. Organic materials generally revealed strong expansion and irreversible compression phases, latter probably due to the collapse of pore and aggregate structures. In contrast to charcoal and manure, peat shows strong expansion below 120°C and compression only above 120°C. Conclusions All investigated samples are heterogeneous on the nanoscale and microscale with respect to thermal behaviour. AFM-nTA allows distinguishing numerous different materials on nanometre and micrometre scales in soil samples. The material-dependent characteristics will help in understanding and learning more about the nanoscale distribution of different materials and properties. Related to the macroscopic thermal behaviour, this will allow studying links between the properties of biogeochemical interfaces and the processes governed by them.

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Section: Introductionmentioning

confidence: 99%

Potential of AFM–nanothermal analysis to study the microscale thermal characteristics in soils and natural organic matter (NOM)

Schaumann

Mouvenchery

2011

J Soils Sediments

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“…They found that repellency increased during heating up to 200°C, but was eliminated at temperatures >200°C due to the destruction of SOM. Several studies have also used thermal analysis to identify specific domains within soils that are responsible for nonlinear and linear sorption behaviors important to contaminant transport in the environment (DeLapp and LeBoeuf, 2004). Conceptual models suggest that nonlinear sorption behavior is attributable to rigid, glass-like regions in SOM, while linear sorption is attributable to more fluid, gel-like regions.…”

Section: Thermal Analyses For Other Som Propertiesmentioning

confidence: 99%

Application of thermal analysis techniques in soil science

2009

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“…Pore volume changes of up to 10% can occur in the shallow horizons of undisturbed peatlands and up to 15% in recently harvested peatlands (Price, 2003). Peat shows only a 0Ð5% expansion of volume during a 10-30°C increase of temperature (DeLapp and LeBoeuf, 2004), suggesting the effect of thermal expansion on VWC is minimal. These processes alter porosity and must be considered before VWC can be used as an indicator of soil water availability.…”

Section: Volumetric Water Contentmentioning

confidence: 99%

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Thompson

Waddington

2008

Ecohydrology

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The genus Sphagnum is the key peat-forming bryophyte in boreal ecosystems. Relying entirely on passive capillary action for water transport, soil moisture is often the limiting factor in Sphagnum production, and hence peat accumulation. While several hydrological models of peat physics and peatland water movement exist, these models do not readily interface with observations and models of peatland carbon accumulation. A conflict of approaches exists, where hydrological studies primarily utilize variables such as hydraulic head, while ecological models of Sphagnum growth adopt the coarse hydrological variables of water table (WT), volumetric water content (VWC) or gravimetric water content (WC). This review examines the potential of soil pressure head as a measurement to link the hydrological and ecological functioning of Sphagnum in peatlands. The nonvascular structure of Sphagnum mosses and the reliance on external capillary transport of water in the mosses make them an ideal candidate for this approach. The main advantage of pressure head is the ability to mechanistically link plot-scale hydrology to cellular-scale water requirements and carbon exchange. Measurement of pressure head may improve photosynthetic process representation in the next generation of peatland models.

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Thermal Analysis of Whole Soils and Sediment

Cited by 36 publications

References 48 publications

Potential of AFM–nanothermal analysis to study the microscale thermal characteristics in soils and natural organic matter (NOM)

Potential of AFM–nanothermal analysis to study the microscale thermal characteristics in soils and natural organic matter (NOM)

Application of thermal analysis techniques in soil science

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

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