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| Release and Vertical Migration of Polycyclic Aromatic Hydrocarbons in Red Soil Under Simulated Acid Rain |
| Received:April 01, 2014 |
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| KeyWord:simulated acid rain;red soil;polycyclic aromatic hydrocarbons(PAHs);release;vertical migration |
| Author Name | Affiliation | | TIAN Wen-jie | Department of Environmental Engineering & Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China | | WANG Xiao-qing | Department of Environmental Engineering & Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China | | LI Dong | Department of Environmental Engineering & Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China | | LI Fa-sheng | Department of Soil Pollution Control, Chinese Research Academy of Environment Sciences, Beijing 100012, China |
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| Abstract: |
| Polycyclic aromatic hydrocarbons(PAHs) have accumulated in many soils. Acid rain may influence their environmental behaviors and ecological effects. This study investigated the impacts of simulated acid rain on release and vertical migration characteristics of USEPA's 16 priority PAHs in red soil columns leached by simulated acid rain in a laboratory experiment. The pH values of the simulated acid rain ranged from 2.5 to 5.6. Leaching with simulated acid rain significantly decreased residues of PAHs in soils. The decline in residual PAHs was the greatest(52.08%) at pH2.5, whereas the least(21.55%) at pH 5.6. Acid rain promoted the vertical migration of PAHs in the soil profile, might due to enhanced concurrent downward migration of soil clay and PAHs resulted from destructed soil microstructures and dispersed soil colloids caused by acid rain. Acid rain had greater effects on the migration of low ring PAHs(ring number≤ 4) than that of high ring PAHs(ring number>4). That is because PAHs with different rings are associated to different soil components. These results would advance our understanding of stability and groundwater pollution risk assessment of PAHs in soils under acid rain. |
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