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| Pollution characteristics and health risk of polychlorinated biphenyls in cultivated soil in the Hetao irrigation areas, Inner Mongolia, China |
| Received:July 17, 2020 |
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| KeyWord:Yellow River irrigation area;polychlorinated biphenyls(PCBs);pollution characteristics;health risk |
| Author Name | Affiliation | E-mail | | LI Ya-fang | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | PEI Guo-xia | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | peiguoxia@126.com | | ZHANG Qi | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | XU Ming | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | |
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| Abstract: |
| To explore the pollution characteristics and assess the health risks of polychlorinated biphenyls(PCBs)in the cultivated layer of the Yellow River irrigation area, 74 grain crop soil surface samples were collected in the Hetao irrigation area in Inner Mongolia. The content and composition of PCBs in the soil were detected and analyzed, and principal component analysis was used to explore their source. The carcinogenic and non-carcinogenic risks of PCBs were evaluated using the United States Environmental Protection Agency health risk assessment model. The results showed that PCBs concentrations ranged from below the detection limit to 246.13 ng·g-1, with an average value of 35.63 ng·g-1, which is higher than that in other domestic irrigation areas. Among these, Urat and Ulanbuhe irrigation areas were the most polluted. The irrigation areas were dominated by low-chlorinated biphenyls. The detection rate of high-chlorinated biphenyls was less than 1%. Principal component analysis identified that PCBs pollution in irrigation areas mainly originated from the use and residues of power equipment and domestic paint coating additives. The health risk assessment showed that PCBs in the soil pose a carcinogenic risk to adults, and carcinogenic and non-carcinogenic risks to children. Oral intake and skin contact were the main risk pathways. |
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