Sediment-water diffusion of PAHs in Wuhu city, China
XU Hong1, WANG Qing1,2, HUA De-wu1, CHENG Jian1, DONG Xiao-ning1
1. School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China;
2. Key Laboratory of Earth Surface Processes and Regional Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China
In order to study the diffusion of polycyclic aromatic hydrocarbons (PAHs) between sediment and water in landscape waters of different functional areas in Wuhu, 25landscape water in Wuhu were selected to collect sediment and water samples in February 2017, 16kinds of PAHs listed as Priority Control Pollutants by the US Environmental Protection Agency (EPA) were tested and analyzed by fugacity method and response coefficient. The effects of total organic carbon (TOC), BCCTO (black carbon measured by chemical thermal oxidation) and BCCr (black carbon determined by wet chemical oxidation) were investigated at different concentrations (measured value, lowest value, average value, maximum value). The results showed that 2-4rings PAHs were diffused from sediment to aqueous, and the sediments were secondary sources of PAHs. 5~6rings PAHs were diffused from aqueous phases to sediment. With the increase of the concentrations of TOC and BC, PAHs tended to diffuse into sediments and the order of sensitivity was BCCr > BCCTO > OC. The diffusion process of sediment-water revealed the important mechanism of migration and diffusion of PAHs in water environment, which could provide basis for the scientific management of environmental pollution.
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