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Quantitative determination of PAH and phenol content in asphalt sample 2702/4

Following the protocol for a HPLC method described under result 5, the quantitative determination of the original PAH content in the selected asphalt sample 2702/4 (Einstreudecke grob / Juchem) was carried out. The global PAH content determined with this method was 4794mg/kg and thus by 50% higher than the value determined with GC-MS. The pattern of distribution of the 16 PAHs, however, was similar. The significantly higher amount must be attributed to the poorer chromatographic resolution and the less selective detection. Since the matrix of asphalt is very complex the bias of quantification is very high with HPLC-UV. From this result the conclusion was drawn to carry out PAH analysis in the project only by GC and GC-MS.

Applying the HPLC method described under result 6, the determination of the original concentration of phenols was determined in the same sample. The results in mg/kg were phenol (3.8), 3-,4-methyl phenol (3.2), 2-methyl phenol (1.0), 2,6-dimethyl phenol (5.2), 4- ethyl phenol (1.0), 2,4-dimethyl phenol (1.0), 2-naphthol (0.2), 2,4,6-Trimethyl phenol (1.0), 1-Naphthol (not found). The total amount of small phenols in sample 2702/4 is thus 16.2mg/kg.

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Saarland University
Im Stadtwald, Campus der Universität, Bau 9.2
66123 Saarbrücken
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