PMID: 11329720May 2, 2001Paper

A distributed reactivity model for sorption by soils and sediments 13. Simulated diagenesis of natural sediment organic matter and its impact on sorption/desorption equilibria

Environmental Science & Technology
M D JohnsonWalter J Weber

Abstract

Subcritical water treatment was used to effect rapid compositional and functional changes to peat organic matter that mimic those of the natural diagenesis process. Elemental, solid state 13C NMR, FTIR, and calorimetry analyses all indicated that the organic matter of the artificially aged peat was chemically similar to that of geologically mature coal kerogens. This paper extends the work of the previous paper in this series, which investigated the effects of subcritical water treatment of humic topsoil on subsequent phenanthrene sorption and desorption equilibria. As opposed to the previous study, however, changes in sorptive reactivity herein were unequivocally related to changes in organic matter rather than other soil constituents, and organic matter functional changes due to the simulated diagenesis were more accurately characterized. Phenanthrene sorption capacity and isotherm nonlinearity both increased with increasing degrees of artificial aging, supporting the viewpoint that hydrophobic organic contaminant sorption equilibrium properties can be directly related to the degree of diagenesis of geosorbent organic matter. In addition, this work investigated effects of subcritical water treatment of a geologically mature, ...Continue Reading

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Oct 12, 2012·Environmental Science and Pollution Research International·Fu-Liu XuShu Tao
Dec 3, 2002·Journal of Chromatography. a·Roger M Smith
Apr 7, 2012·Environmental Science & Technology·Philip T GidleyUpal Ghosh
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Jun 6, 2006·Environmental Science & Technology·Mónica Palomo, Alok Bhandari

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