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This article in JEQ

  1. Vol. 29 No. 1, p. 317-323
     
    Received: Dec 1, 1998
    Published: Jan, 2000


    * Corresponding author(s): wjwjr@engin.umich.edu
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doi:10.2134/jeq2000.00472425002900010040x

Relationship of Soil Organic Matter Characteristics to Organic Contaminant Sequestration and Bioavailability

  1. Angela D. Lueking,
  2. Weilin Huang,
  3. Sara Soderstrom-Schwarz,
  4. Minsun Kim and
  5. Walter J. Weber
  1. Environmental and Water Resources Eng., Dep. of Civil and Environ. Eng., Univ. of Michigan, Ann Arbor, MI 48109.

Abstract

Abstract

Sorption and desorption equilibria of phenanthrene with respect to three different types of geosorbents were measured, as were the rates of desorption and biological mineralization of this representative hydrophobic organic contaminant. The chemical nature of the organic matter associated with each geosorbent was characterized using solid state 13C-NMR spectrometry. The results of these studies reveal that both the desorption behavior and the microbial bioavailability of the sorbed contaminant are influenced by the physicochemical character of the organic matter. The more reduced and condensed the organic matter, the greater the extent of sorption-desorption hysteresis, the slower the desorption rate, and the less readily bioavailable the sorbed contaminant. These observations are consistent with projections predicated on a dual reactive domain model introduced earlier to describe the sorptive reactivities of different types of soil/sediment organic matter with hydrophobic organic contaminants.

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