Effects of diagenetic processes on sorption energetics

Article Abstract:

A model was developed to account for the relationship between sorbent qualities and the hydrophobic organic compound sorption desorption phenomena and for the divergence observed in the isosteric heat values obtained from isotherms when a pure supercooled solute standard state was used. Under this model, natural organic matter is seen as a macromolecule which, with the help of diagenetic processes, is in the process of changing from an amorphous structure into a highly condensed and microcrystalline substance.

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Enthalpy and polarity effects on desorption under supercritical fluid conditions

Article Abstract:

The displacement of organic chemicals from polar sites on mineral surfaces or within soil organic matter in the presence of a polar solvent competitor determines polar cosolvent desorption. The results have implications for understanding the desorption of organic chemicals within water-saturated subsurfaces, although the study used phenanthrene and methanol as the cosolvents. Supercritical carbon dioxide was used to allow the effective measurement of isotherms and desorption enthalpies.

Research and Development in the Physical, Engineering, and Life Sciences, Pollution R&D NEC, Research, Pollution control research, Thermal desorption

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Response to comment on "A distributed reactivity model for sorption by soils and sediments, part 4, Intraparticle heterogeneity and phase-distribution relationships under nonequilibrium conditions." (response to article by Joseph A Pedit and Cass T. Miller, in this issue, p. 3128)

Article Abstract:

Three models were proposed to explain the sorption of phenanthrene by soils and sediments: the three-domain particle-scale model, first-order mass transfer model and, pore-diffusion model. Pedit and Miller's conclusions about these models actually support, rather than contradict, the authors' results that the rates of sorption of solutes by soil and sediments is influenced by intraorganic matrix diffusion within a rigid porous structure.

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