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Desorption kinetics of chlorobenzenes, polycyclic aromatic hydrocarbons, and polychlorinated biphenyls: Sediment extraction with Tenax® and effects of contact time and solute hydrophobicity

Authors

  • Gerard Cornelissen,

    Corresponding author
    1. Institute for Inland Water Management and Waste Water Treatment, Lelystad, The Netherlands
    • Institute for Inland Water Management and Waste Water Treatment, Lelystad, The Netherlands
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  • Paul C. M. van Noort,

    1. Institute for Inland Water Management and Waste Water Treatment, Lelystad, The Netherlands
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  • Harrie A. J. Govers

    1. Department of Environmental and Toxicological Chemistry, ARISE, University of Amsterdam, Amsterdam, The Netherlands
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Abstract

A technique using Tenax TA® beads as “sink” for desorbed solute was employed to measure the kinetics of desorption of chlorobenzenes, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons from laboratory-contaminated sediment. First-order rate constants of rapid and slow desorption were in the order of 10−1/h and 10−3/h, respectively. The rate constants of slow desorption correlate well with the molecular volumes of the compounds used and decrease between 2 and 34 d of equilibration. Slowly desorbing fractions increase with both increasing solute hydrophobicity and increasing equilibration time.

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