Distribution and mass inventories of polycyclic aromatic hydrocarbons and organochlorine pesticides in sediments of the Pearl River Estuary and the northern South China Sea

Graduate School, Chinese Academy of Sciences, Peping, Beijing, China
Environmental Science and Technology (Impact Factor: 5.48). 03/2006; 40(3):709-14. DOI: 10.1021/es052060g
Source: PubMed

ABSTRACT Surface sediment (0-5 cm) samples were collected from the Pearl River Estuary (PRE) and the adjacent northern South China Sea (SCS) in July 2002 and analyzed for 25 polycyclic aromatic hydrocarbons (PAHs) and 8 organochlorine pesticides (OCPs) including dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs), and heptachlor. The total PAHs and OCPs concentrations were 138-1100 and 0.18-3.57 ng/g dry weight, respectively. Compositional pattern analysis suggested that PAHs in the PRE were derived from both pyrogenic and petrogenic sources, whereas most PAHs in the northern SCS were pyrogenically originated. The concentrations of both PAHs and OCPs were higher in the PRE than in the northern SCS, and a decreasing trend with the distance from the estuary to the open sea was observed. In addition, perylene was a predominant component in all samples and clustered with PAH compounds with high log Kow values (from phenanthrene). These findings indicated that river outflows were the major source of contamination in the offshore sediments. A preliminary assessment suggested that atmospheric deposition contributed only a minor portion of PAHs or OCPs in the sediments of the northern SCS. The sediment (0-5 cm) mass inventories were 126 and 423 metric tons for PAHs and were 0.4 and 1.4 metric tons for OCPs in the PRE and the northern SCS, respectively. Clearly, contaminated sediments of the northern SCS may be a potential source of PAHs and OCPs to the global oceans.

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    • "These results indicated the presence of new DDT inputs in the neighboring environment of the Natuna Island, SCS. Fresh inputs of DDTs were also reported in fish (Sun et al., 2014), sediments (Chen et al., 2006; Li et al., 2014), air and surface seawater (Zhang et al., 2007) from the northern SCS. The ratios of o,p 0 -DDT/p,p 0 -DDT in fish samples were less than 1 (except one DT sample, 1.32), suggesting that DDT was unlikely from dicofol. "
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    Marine Pollution Bulletin 08/2014; 85(1):274-279. DOI:10.1016/j.marpolbul.2014.05.058 · 2.79 Impact Factor
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    • "where : " I " is the total mass inventory ( in metric tons ) of organic marker , " C i " is the mean concentration of organic marker ( in ng g À1 dw ) in the study area , " A " represents the water area ( w160 km 2 ) , " d " is the thickness of the sediment sampled ( d ¼ 2 cm ) and " r " represents the density of the sediment ( w1 . 5 g cm À3 ) ( Chen et al . , 2006 ) ."
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    • "However, more than 25.6% samples had values of (DDE + DDD)/DDTs lower than 0.5, suggesting that the occurrence of fresh DDT input could not be excluded entirely. New inputs of DDTs were also found to exist in air, sediments and surface seawater from the northern SCS (Chen et al., 2006; Zhang et al., 2007). "
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    Chemosphere 03/2014; 98:84-90. DOI:10.1016/j.chemosphere.2013.10.008 · 3.50 Impact Factor