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Polycyclic and organochlorine hydrocarbons in sediments of the northern South China Sea.
Marine Pollution Bulletin 2018 December
We investigated the concentration distribution and composition of organic pollutants in sediments of the shelf and the deep northern South China Sea (NSCS). Concentrations of polycyclic aromatic hydrocarbons (Σ15 PAH; 10.69-66.45 ng g-1 ), Dichlorodiphenyltrichloroethane (Σ4 DDT; 0-0.82 ng g-1 ), and polychlorinated biphenyls (Σ24 PCB; 0-0.12 ng g-1 ) are below established sediment quality guidelines, suggesting no environmental risk. Surprisingly, concentrations increase from the shelf to the deep NSCS, and are higher in the east of the study area. The organic pollutant composition indicates PAH mainly derived from pyrogenic sources, and mostly degraded DDT and PCB. However, in the deep NSCS, considerable contribution of petrogenic PAH, low chlorinated PCB and p,p'-DDT suggest more recent input from different sources compared to the shelf. From these results we infer that organic pollution in the NSCS does not originate from the Pearl River Estuary but from the NE SCS, SW of Taiwan.
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