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| Source analysis and risk assessment of PAHs in Vigna unguiculata(Linn.)Walp in different culture environments |
| Received:August 21, 2018 |
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| KeyWord:Vigna unguiculata (Linn.)Walp;PAHs;content;source analysis;risk assessment |
| Author Name | Affiliation | E-mail | | WU Gui-fen | Agricultural College, Guangxi University, Nanning 530006, China | | | LONG Ming-hua | Agricultural College, Guangxi University, Nanning 530006, China | longmhua@163.com | | QIAO Shuang-yu | Agricultural College, Guangxi University, Nanning 530006, China | | | ZHAO Ti-yue | Agricultural College, Guangxi University, Nanning 530006, China | | | ZHANG Hui-min | Agricultural College, Guangxi University, Nanning 530006, China | |
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| Abstract: |
| We evaluated the source and risk of polycyclic aromatic hydrocarbons (PAHs) in vegetables cultivated under different pollution conditions using Vigna unguiculata (Linn.) Walp as the study material. PAH contents were detected in Vigna unguiculata (Linn.) Walp planted in a shed (PAH contamination residue area) and field (within 100 m of a motorway). The PAH source was analyzed by the isomer ism method. The ecological risk of PAH pollution in Vigna unguiculata (Linn.) Walp was evaluated using the low median method of ecolog ical effect and toxicity equivalent of pyrene (a) pyrene (TEQBaP). The potential human health risk was estimated by daily pollution human exposure levels. The results showed that, of the 16 types of PAH, 13 were found in samples planted in the shed and 6 were found in those planted in the field. The total PAH content in the shed plants was 253.94 μg·kg-1, which mainly contained 2~4 rings; 3-ring PAHs ac counted for 64.47%. The total PAH content in the field plants was 80.60 μg·kg-1, while fluorene and phenanthrene accounted for 69.69%. The TEQBaP of dibenzo (a,h) anthracene in Vigna unguiculata (Linn.) Walp planted in the shed and field were 43.32 μg·kg-1 and 10.85 μg·kg-1, respectively, which represented 89.38% and 88.57% of the total TEQBaP. The health risk factors of shed and field plants were 2.07×10-6 and 6.5×10-7, respectively. Most PAHs in Vigna unguiculata (Linn.) Walp planted in the shed came from man-made pollution treatment, whereas for those planted in the field, PAHs were mainly derived from gas and biomass burning. Vigna unguiculata (Linn.) Walp planted in the shed exhibited a certain extent ecological risk but those planted in the field showed no risk; however, the enrichment of benzo (k) fluoranthene, dibenzo (a,h) anthracene and indeno (1,2,3-c,d) pyrene is a serious cause for concern. |
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