title: Enrichment behavior and transport mechanism of soil-bound PAHs during rainfall-runoff events.
abstract: Polycyclic Aromatic Hydrocarbons (PAHs) transported by surface runoff result in nonpoint source pollution and jeopardize aquatic ecosystems. The transport mechanism of PAHs during rainfall-runoff events has been rarely studied regarding pervious areas. An experimental system was setup to simulate the runoff pollution process on PAHs-contaminated soil. The enrichment behavior of soil-bound PAHs was investigated. The results show that soil organic matters (SOM), rather than clay particles, seem to be the main carrier of PAHs. The enrichment is highly conditioned on runoff and erosion processes, and its magnitude varies among PAH compounds. It is not feasible to build a simple and universal relationship between enrichment ratio and sediment discharge following the traditional enrichment theory. To estimate the flux of PAHs from pervious areas, soil erosion process has to be clearly understood, and both organic carbon content and composition of SOM should be factored into the calculation.
authors.affiliation: Center for Water Research, College of Engineering, Peking University, Beijing 100871, China. yizheng@coe.pku.edu.cn
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Luo
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Feng
authors.initials: F
authors.lastname: Han
authors.forename: Zhongrong
authors.initials: Z
authors.lastname: Lin
authors.forename: Xuejun
authors.initials: X
authors.lastname: Wang
mesh_terms: D004784:Environmental Monitoring; D055593:Geological Phenomena; D008956:Models, Chemical; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D011891:Rain; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014887:Weather
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical