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| Distribution of Polycyclic Aromatic Hydrocarbons in Surface Soils of Yinchuan Plain and Surrounding Areas |
| Received:May 28, 2014 |
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| KeyWord:polycyclic aromatic hydrocarbons(PAHs);Yinchuan Plain;surface soil;distribution characteristic |
| Author Name | Affiliation | E-mail | | LI Tong-chao | Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China | | | LI Wei | Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China | | | YUAN Chen-yi | Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China | | | TAO Shu | Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China | taos@pku.edu.cn |
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| Abstract: |
| The emissions of polycyclic aromatic hydrocarbons(PAHs) can result in contamination of soils and agricultural products. In this study, 37 surface soil samples were collected from Yinchuan Plain and the surrounding areas. Sixteen US EPA priority pollutant PAHs were measured individually to address their geographical distribution pattern in soils. The total concentrations of the 16 PAHs varied from 17.2 to 1 199.3 ng·g-1 with arithmetic and geometrical means of 190.6±232.2 ng·g-1 and 125.9 ng·g-1, respectively, which were generally lower than those reported for other areas. The dominant PAHs were two or three ring compounds, typically anthracene and phenanthrene. The isomer based source apportionment suggested that the PAHs were primarily originated from combustion. Uneven spatial distribution was observed with relatively high concentrations found in the north and south areas and relatively low in the east and west ones. The spatial distribution pattern of PAHs was associated with that of emission sources and soil total organic carbon(TOC). The concentrations of PAHs in cropland soils were much higher than those in grassland and sparsely-vegetated land soils, likely due to high TOC contents in the cropland soils. |
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