Distribution and mass inventories of polycyclic aromatic hydrocarbons and organochlorine pesticides in sediments of the Pearl River Estuary and the northern South China Sea
Distribution and mass inventories of polycyclic aromatic hydrocarbons and organochlorine pesticides in sediments of the Pearl River Estuary and the northern South China Sea
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DOI：
10.1021/es052060g
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发表时间：
2006-02-01
影响因子：
11.4
通讯作者：
Zeng, EY
中科院分区：
文献类型：
--
作者：
Chen, SJ;Luo, XJ;Zeng, EY
2002年7月采集了珠江口及邻近的南海北方海域表层沉积物（0-5 cm）样品，分析了其中25种多环芳烃（PAHs）和8种有机氯农药（OCPs）的含量。结果表明，该海域多环芳烃和有机氯农药的总浓度分别为138-1100和0.18-3.57 ng/g干重。组成模式分析表明，在PRE的多环芳烃来源于火成和岩石的来源，而大多数多环芳烃在北方南海是火成来源。南海北部海域多环芳烃和不饱和脂肪酸的浓度均高于南海北方海域，且随距离的增加呈下降趋势。此外，在所有样品中，二萘嵌苯是一个主要的组成部分，并与PAH化合物具有高的log K（ow）值（从菲）聚类。这些发现表明，河流流出是近海沉积物中污染的主要来源。初步评估表明，大气沉降贡献的多环芳烃或OCPs的北方南海沉积物中的一小部分。沉积物（0-5厘米）的质量库存分别为126和423公吨的多环芳烃和0.4和1.4公吨的UPS在PRE和北方南海，分别。显然，南海北方受污染的沉积物可能是全球海洋中多环芳烃和OCPs的潜在来源。
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 organo-chlorine pesticides (OCPs) including dichlorodiphenyl-trichloroethanes (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 UPS 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 K(ow) 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 UPS 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.