A distributed reactivity model for sorption by soils and sediments. 10. relationships between desorption, hysteresis, and the chemical characteristics of organic domains

Article Abstract:

Results from the phenanthrene sorption and desorption procedures conducted on ten natural sorbents, which included three geologically young peats, one humic acid, three geologically old shales, and samples of kerogen isolated from the shales, indicate that the Dual Reactive Domain Model is useful in examining the overall behavior of soils and sediments. The materials' hysteretic behavior and attraction to phenanthrene correlated inversely with the oxygen/carbon atomic ratios of the soil organic matter associated with the samples.

Research and Development in the Physical, Engineering, and Life Sciences, Pollution Control R&D, Hysteresis, Hysteresis (Physics), Pollution control research

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Intraparticle heterogeneity and phase-distribution relationships under nonequilibrium conditions

Article Abstract:

The distributed reactivity model has been extended to sorption rate processes for heterogeneous natural solids in nonequilibrium conditions. Rates of uptake under various gradients in solute concentrations were measured through multiple experimental systems having several initial aqueous-phase solute concentrations. A three-domain particle-scale model was used to elucidate the sorption behavior and functional relationships framing the time dependence of the solute phase distribution relationships.

Soil mechanics, Sediments (Geology)

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The influence of near-surface characteristics in mineral domains

Article Abstract:

The sorption of phenanthrene on surfaces of INNrganic mineral solids was investigated by sorption rate and equilibrium experiments. Sorption rates of the organic solute varied for the non-porous sorbents, porous silica gels and bentonite. The differences in sorption behavior were attributed to the differences in the surface chemistry properties, intraparticle porosities and pore size distributions of the mineral solids.

Organic compounds

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