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Related Experiment Videos

Cosolvent effects on sorption isotherm linearity.

Dermont C Bouchard1

  • 1US Environmental Protection Agency, Ecosystems Research Division, Athens, GA 30605, USA. bouchard.dermont@epa.gov

Journal of Contaminant Hydrology
|July 10, 2002
PubMed
Summary
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This study shows methanol enhances sorption isotherm linearity in natural organic matter (NOM), supporting the polymer conceptualization of NOM. Methanol also increases sorption magnitude and kinetics, suggesting faster uptake by the rubbery polymer fraction.

Area of Science:

  • Environmental Chemistry
  • Polymer Science
  • Soil Science

Background:

  • Nonideal sorption phenomena in soils and sediments are linked to natural organic matter (NOM) polymer characteristics.
  • The rubbery/glassy polymer model is a conceptual framework for understanding NOM sorptive behavior.

Purpose of the Study:

  • To investigate the effect of methanol as a cosolvent on sorption isotherm linearity with NOM.
  • To assess if observed effects support or weaken the polymer conceptualization of NOM.
  • To evaluate changes in sorption magnitude and kinetics with varying methanol content.

Main Methods:

  • Sorption experiments using aqueous and mixed solvent (methanol-water) systems.
  • Analysis of sorption isotherm linearity for phenanthrene and atrazine.

Related Experiment Videos

  • Measurement of sorption kinetics in methanol-water sediment column systems.

    • Main Results:

    • All sorption isotherms exhibited some nonlinearity.
    • Isotherm linearity increased with volumetric methanol content (fc).
    • Greater relative sorption magnitude and faster sorption kinetics were observed in methanol-water treatments.

    Conclusions:

    • Methanol enhances NOM sorption isotherm linearity, consistent with the polymer model.
    • Methanol interacts with NOM, increasing phase homogeneity and reducing bimodal sorption.
    • Increased sorption magnitude is linked to faster kinetics in the rubbery polymer fraction of NOM.