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Combined modifier/in situ derivatization effects on supercritical fluid extraction of polycyclic aromatic hydrocarbons from soil


Combined modifier/in situ derivatization effects on supercritical fluid extraction of polycyclic aromatic hydrocarbons from soil



Journal of Chromatography A 811(1-2): 151-156



ISSN/ISBN: 0021-9673

DOI: 10.1016/s0021-9673(98)00266-0

Supercritical fluid extraction (SFE) of polycyclic aromatic hydrocarbons (PAHs) from a real environmental soil sample containing a high content of humic acids was enhanced by using modifier and in situ derivatization. The addition of 10 mol% methanol increased the ability of the supercritical CO2 (recovery set to 100%) to displace PAHs from matrix active sites up to an average value of 145%. In situ derivatization was performed under dynamic SFE conditions using boron trifluoride (BF3) in methanol as modifier. Comparing the results of the SFE extraction with methanol and with BF3 in methanol showed that the addition of BF3 increased the PAH recoveries further. Increasing BF3 concentration gave higher extraction yields of PAHs. A second SFE of the same sample with CO3-methanol improved the average extraction yield for only 2%, whereas a second SFE of a CO2-methanol extracted sample with CO2-methanol-BF3 increased the average yield for 18%. Especially the recoveries of the penta- and hexacyclic PAHs were increased by the addition of BF3. The results indicate that the strong Lewis acid BF3 cleave humic substances of the matrix releasing aromatic acids in the extract which were detected by HPLC-diode array detection. As a result of this PAHs associated to the matrix were also released in the extract.

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Accession: 003386199

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