Community Research and Development Information Service - CORDIS

Method for sample preparation, GC and GC-MS analysis of PAH in asphalt

A 3 step batch extraction under sonication was developed to extract contaminants from asphalt. 5mL CH2Cl2 are applied per g asphalt, sonication is applied for 15 minutes and the solid residue and supernatant are separated by centrifugation. To the combined extracts a defined amount of C23 is added as internal standard. Then 100µL of the organic extracts in CH2Cl2 obtained as described above are deposited on a small, dry, silica gel column (55mm x 5mm) for purification. A Pasteur pipette can be used for that purpose.

The first fraction (1000µL) eluted with CH2Cl2 contains the PAH. This fraction can be directly injected into the GC applying a standard method for separation of the 16 EPA PAHs. Quantification of PAHs using a flame ionisation detector is carried out relative to C23 considering the individual ratio of C-atoms.

Applying alternatively the highly selective mass spectrometric detection, individual calibration curves (relative to C23) were recorded and considered for quantification. The methods were validated for application with the original course asphalt sample and with a fine homogeneous powder obtained by milling. It turned out that only the milling of the asphalt prior to subdividing and extraction enables separation of representative aliquots and reliable analysis.

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Université Louis Pasteur, Strasbourg 1
25, rue Becquerel
67200 Strasbourg
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