Content and Risk Evaluation of Polycylic Aromatic Hydeocarbons(PAHs) of Tobacco-planting Soil and Flue-cured Tobacco in Yunnan province

The content of 16 polycyclic aromatic hydrocarbons(PAHs) of tobacco-planting soil and flue-cured tobacco were investigated in Qujing and Yuxi city of Yunnan province, the polluted condition and correlations were also investigated and analyzed. The results showed that 15 PAHs were determined in soil, The detection rate of each monomer between 6.90%～81.03%(acenaphthene was not detected). The total content of PAHs was between 24.30～840.30 μg/kg, with an average of 115.97 ± 203.60μg/kg. PAHs species with four or more rings comprised the most PAHs. The single pollution index evaluation showed the BaPeq of 15 PAHs don't exceed standard in tobacco-planting soil. However, the total BaPeq was beyond standard in 2 sites. Fifteen PAHs were determined in tobacco, the detection rate of each monomer between 13.33%～100.00%(acenaphthene was not detected). The total content of PAHs between 81.90～1552.70 μg/kg, with an average of 480.44 ± 418.78 μg/kg. PAHs species with four or more rings comprised the most PAHs, toxic equivalent concentration(TEQ Bap) of carcinogenic PAHs accounted for 86.85%. The result of Spearman order correlation test methods showed that the content of PAHs in tobacco were unrelated to soil.