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| Influences of DOM and pH on PAHs Migrations in Soil Columns |
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| KeyWord:reclaimed water irrigation; polycyclic aromatic hydrocarbons（PAHs）; dissolved organic matter（DOM）; pH |
| Author Name | Affiliation | | QIAO Xiao-cui | Beijing Key Laboratory of Water Resources and Environment Engineering, China University of Geosciences（Beijing）, Beijing 100083, China | | HE Jiang-tao | Beijing Key Laboratory of Water Resources and Environment Engineering, China University of Geosciences（Beijing）, Beijing 100083, China | | YANG Lei | Beijing Key Laboratory of Water Resources and Environment Engineering, China University of Geosciences（Beijing）, Beijing 100083, China | | ZOU He-ping | Beijing Key Laboratory of Water Resources and Environment Engineering, China University of Geosciences（Beijing）, Beijing 100083, China |
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| Abstract: |
| Vertical migrations of polycyclic aromatic hydrocarbons（PAHs） in soils are influenced by many factors. In a simulated experiment, vertical migrations of PAHs in soil columns were investigated at different levels of DOM and pH. Chloride ion（Cl-） was used to correct the migration rates of PAHs. The migration rates of PAHs were influenced by DOM concentrations. At low concentrations, DOM restrained the vertical migrations of PAHs, due to its cumulative adsorption and co-adsorption. At high concentrations, however, DOM formed surfactant colloids, and the PAHs could enter the colloids, leading to increased migrations. The migrations of PAHs in the columns increased with increasing pH values, due to promoted electrostatic exclusion from more charges of DOM from the dissociation at higher pH. |
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