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| Characteristics and health risk assessment of polychlorinated biphenyls in surface soil of the Yangtze River |
| LU Yin-tao1, LIU Ming-li1,2, LIU Yin-zuo1, ZHANG Shi-chao1, XIANG Xin-xin1, YAO Hong1 |
1. Department of Municipal and Environmental Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. CCCC-AECOM Eco-Enviromental Co., Ltd, Beijing 100010, China |
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Abstract Polychlorinated biphenyls (PCBs) concentration in surface soil samples collected from 14mainstream and 18branch cross sections of the Yangtze River were analyzed by GC-MS. The residual characteristics, pollution sources, and ecological risks were also analyzed. The results showed that the concentrations of total PCBs in surface soil ranged from 1.05 to 50.11ng/g dry weight (ng/g dw), with an average value of 5.71ng/g dw, and the PCBs concentration in this study was in a comparatively low level. The content of PCBs in the mainstream has gradually increased from the upstream to the downstream, and the total content of PCB in the second and third-tier cities such as Yichang, Yueyang, Wuhan and Chongqing was relatively high. PCB17, PCB18, PCB44, PCB74, PCB87 were identified as the prevalent contaminates of the surface soil. Tri-and tetra-chlorobiphenyl were the main congeners, indicating that the surface soil in the Yangtze River basin was mainly contaminated with low-chlorobiphenyl. The principal component analysis showed that PCBs mainly come from the mixed pollution sources of No. 1transformer oil, Aorclor 1242, 1248, atmospheric deposition and surface runoff. The health risk assessment of surface soil in the Yangtze River Basin showed that PCBs have a relatively low risk, and the potential risk of inhalation was lower than accidental ingestion and dermal contact.
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Received: 07 May 2018
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