A two-step procedure for the supercritical fluid extraction (SFE) of polycyclic aromatic hydrocarbons from soil samples was developed. The procedure consists of a static supercritical fluid treatment in a closed extraction cell at a high temperature (T = 250 deg C or 340 deg C for 20 min) and an SFE with a solvent trapping. During the static phase, the sample is exposed to a supercritical organic solvent (methanol, toluene, dichloromethane, ACN, acetone, and hexane). The solvent penetrates particles of the matrix to substitute strongly bonded molecules and dissolves the analytes in the supercritical phase. At ambient temperature, supercritical fluids became liquid and lost their solvation abilities. Most of the analytes condense on the surface of the particles or on the extraction cell walls without forming strong bonds or penetrating deep into the matrix. Thus, the pretreatment liberates the analytes and they behave similar to those in freshly spiked samples. The common SFE with toluene-modified CO2 as an extraction fluid follows the static phase. With the use of the most suitable extraction phases (toluene, ACN), the extraction efficiency of the combined procedure is much higher (about 100 %). The results of the combined procedure are compared to the SFE procedure of the same untreated sample (difference less than 5 %) and to the Soxhlet extraction. The extracts were analyzed using a GC with the flame ionization detection.


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    Titel :

    A two-step supercritical fluid extraction of polycyclic aromatic hydrocarbons from roadside soil samples


    Weitere Titelangaben:

    Eine zweistufige überkritische Fluid-Extraktion polycyclischer aromatischer Kohlenwasserstoffe aus Bodenproben vom Straßenrand


    Beteiligte:
    Lojkova, Lea (Autor:in) / Sedlakova, Jitka (Autor:in) / Kuban, Vlastimil (Autor:in)

    Erschienen in:

    Journal of Separation Science ; 28 , 16 ; 2067-2075


    Erscheinungsdatum :

    2005


    Format / Umfang :

    9 Seiten, 2 Bilder, 3 Tabellen, 18 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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