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On‐Line Solid Phase Extraction for Polycyclic Aromatic Hydrocarbons in Soil Column Effluents
Author(s) -
Weigand Harald,
Totsche Kai U.,
KögelKnabner Ingrid
Publication year - 1999
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1999.00472425002800020043x
Subject(s) - extraction (chemistry) , effluent , solid phase extraction , chemistry , anthracene , chromatography , environmental chemistry , sorption , soil water , fraction (chemistry) , adsorption , environmental science , environmental engineering , soil science , organic chemistry
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.