| 珠江及南海北部海域表层沉积物中多环芳烃分布及来源 |
| 摘要点击 3248 全文点击 2790 投稿时间：2004-10-12 修订日期：2004-11-14 |
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| 中文关键词 多环芳烃 珠江三角洲 南海 沉积物 |
| 英文关键词 polycyclic aromatic hydrocarbon Pearl River Delta South China Sea sediment |
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| 中文摘要 |
| 珠江三角洲河流、河口及南海北部近海区域多环芳烃(PAHs)分析表明,PAHs总量分布范围在255.9～16670.3ng/g,整体污染水平处于中偏低下水平.分布特征为珠三角河流>伶仃洋>南海;珠江广州段是高污染区;沿南海近海海域4条剖面,随离岸距离增加,浓度下降.西江、伶仃洋及珠江部分站点石油污染比重大,南海近海则受燃烧来源比重大.PAHs来源诊断指标表明,珠江三角河流及伶仃洋更多受石化燃料燃烧的影响,南海近海区则主要受木柴、煤燃烧的影响.与1997年样品的对比表明,多环芳烃污染程度无明显下降,但区域内PAHs来源从以煤燃烧为主转变为以油燃烧为主,这种近期能源结构的转变在沉积速率较快的珠三角河流及伶仃洋表层沉积物中得到反映. |
| 英文摘要 |
| Polycyclic aromatic hydrocarbons (PAHs) are measured in surface sediments from rivers and estuary of Pearl River Delta and its nearby South China Sea. Total PAH concentration varied from 255.9～16 670.3 ng/g and a moderate to low level compare to relevant areas worldwide. The order of PAHs concentration in sediments was: rivers of Pearl River Delta>estuary>South China Sea, and the most significant PAH contamination was at Guangzhou channel of Zhujiang river. A decrease trend for PAHs concentration with distance from estuary to open sea can be sees in South China Sea. Coal and biomass combustion is the major source of PAHs in nearshore of South China Sea, and petroleum combustion is the main source of pyrolytic PAHs in rivers and estuary of Pearl River Delta according to PAHs diagnostic ratios. Petroleum PAHs are revealed have a high contribution to PAHs in Xijiang River, estuary and some stations in Zhujiang River. A comparison of data from study in 1997 with data from present study indicates that there is no clear change in the PAH concentration over time but the source of PAHs in Pearl River Delta have been change from a main coal combustion to petroleum combustion and being reflect in the sediments in rivers and estuary of Pearl River Delta where there have high sedimentation rate. |
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