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| Residual characteristics and source analysis of polychlorinated biphenyls in surface soil of the Jiefangzha irrigation area, Inner Mongolia, China |
| Received:May 07, 2019 |
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| KeyWord:Jiefangzha irrigation area;PCBs;surface soil;residual characteristics;source analysis |
| Author Name | Affiliation | E-mail | | XIAO Lei | Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | PEI Guo-xia | Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | peiguoxia@126.com | | ZHANG Qi | Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | | | YAO Yu-tong | Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China | |
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| Abstract: |
| The residual characteristics of polychlorinated biphenyl(PCB)congeners in 49 surface soil samples collected from the Jiefangzha irrigation area were analyzed by gas chromatography-electron capture detection. The residual characteristics, spatial distribution, and pollution sources were also analyzed. The results showed that the total PCB concentrations in surface soil ranged from below detection limits to 209.95 ng·g-1, with an average value of 15.09 ng·g-1. PCB concentrations observed in this study were comparatively low. PCB1, PCB29, and PCB47 were identified as the most prevalent contaminants in surface soil. The relative PCB homologue content in soil decreased in the following order:PCB29(38.65%) > PCB1(33.33%) > PCB47(11.62%) > PCB5(8.25%) > PCB98(8.14%), indicating that the surface soil in the Jiefangzha irrigation area was mainly contaminated with lower-chlorinated biphenyls. There was a noticeable pattern in the spatial distribution of PCB concentrations in the soil, which was higher in the northeast than in the southwest, and was also sporadic in the southwest. While the soil pH was found to have a significant effect on PCB concentration, it was not affected by organic matter, electrical conductivity, or sand, powder, and clay content. The results of correlation analysis and factor analysis showed that the main sources of PCB pollution in the topsoil of the irrigation area were capacitor and transformer oils. |
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