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This article in JEQ

  1. Vol. 28 No. 2, p. 730-732
     
    Received: May 19, 1998
    Published: Mar, 1999


    * Corresponding author(s): totsche@uni-bayreuth.de
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doi:10.2134/jeq1999.00472425002800020043x

On-Line Solid Phase Extraction for Polycyclic Aromatic Hydrocarbons in Soil Column Effluents

  1. Harald Weigand,
  2. Kai U. Totsche * and
  3. Ingrid Kögel-Knabner
  1. Technische Universität München, Lehrstuhl für Bodenkunde, 85350 Freising-Weihenstephan, Germany;
    Univ. of Bayreuth, Soil Physics Div., 95440 Bayreuth, Germany.

Abstract

Abstract

On-line solid phase extraction with C-18 cartridges provided a reliable method for the extraction of polycyclic aromatic hydrocarbons (PAHs) from soil column effluents. The on-line extraction was compared to the common off-line extraction of effluent fractions with respect to the mass recoveries of an internal standard. The effluent was obtained from a water unsaturated soil column under steady state water flow conditions. The column was packed with an artificially anthracene-contaminated soil material. Our results showed superior and more reproducible PAH trapping when the on-line extraction was used. The PAH mass recoveries were unaffected by the range of dissolved organic carbon (DOC) concentrations covered in the experiment. This held true over a range of pHs and water unsaturated conditions of the C-18 material. By using the on-line extraction procedure, losses of PAHs due to sorption to the surfaces of collection vessels were avoided. The combination with a fraction collector allowed for the extraction of very small sample volumes. Thus, the method is suitable for an unbiased evaluation of PAH mobility in soil column experiments.

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