Distribution pattern of PAHs in Jiulong River Estuary by both measurement and simulation
KE Hong-wei1, CHEN Kai2, ZHAO Wen-lu1, CHEN Mian1, LIN Yan1, LIU Meng-yang1, WANG Jun1, LIN Jing1,3, CAI Ming-gang1,2
1. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;
2. Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China;
3. Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Abstract：The concentration of 16 polycyclic aromatic hydrocarbons(PAHs) of nine water samples, collected in the Jiulong River Estuary in December, 2011, were analyzed using the SPE-GC-MS method. The results showed that the concentration range of total dissolved PAHs(ΣPAHs) was from 157.9 to 858.0 ng/L. The horizontal distribution illustrated that the concentration of ΣPAHs decreased as salinity increased. Based on ratio analysis, PAHs have complicated sources. A Level Ⅲ fugacity model was developed to simulate the multimedia fate of PAHs and to study the air-water exchange fluxes of three PAHs(phenanthrene, pyrene, benzo[a]pyrene) in the Jiulong River Estuary. The calculated concentration of PAHs was similar to that measured in this study or reported in earlier literature. At 16℃, the net atmosphere deposition fluxes of these PAHs were 17.38, 7.86 and 8.38μg/day/m2. Phenanthrene was predominant in the atmospheric deposition. The net atmospheric deposition fluxes of these PAHs all decreased with temperature. When the temperature was above 32.0℃, benzo[a]pyrene was released from the water into the air.
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