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Polycyclic aromatic hydrocarbons (PAHs) of soils from two maize growing fields were analyzed for molecular structure by gas chromatography-mass spectrometry, for 13 C/ 12 C ratios by isotope ratio mass spectrometry and for 14 C age by accelerator mass spectrometry. These investigations indicate that the aromatic fractions are dominated by pyrolytic inputs. Calculation...
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