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Evaluation of Supercritical Fluid Extraction (SFE) of PAH in soil samples

Toetsing van superkritische vloeistofextractie (SFE) voor PAK in grond

Synopsis

PAH were extracted using supercritical CO2 (high pressure and temperature), afterwhich components were trapped on a solid trap and eluted with acetone. The method was compared with the conventional acetone extraction and, less thoroughly, with Microwave Assisted Solvent Extraction (MASE). Comparing the validation of the three methods showed no differences for either spiked and field samples. The methods were applied to sandy soil, woodland soil and marine clay samples. The average recovery for sandy soil samples in comparison with acetone extraction varied for SFE between 65% and 178% and for MASE between 46% and 197%. The overall recoveries for SFE and MASE were comparable (129% and 126%, respectively). Comparable results were found for the other soil matrices. The water and organic matter content were investigated to explain these differences in recovery. Both parameters seemed to have an influence on the extraction efficiency of SFE, but the effects of the parameters were not always clear. The structure of the matrix may also have played an important role during extraction.
 

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