广州珠江表层沉积物中石油烃分布特征研究

对珠江广州段7个采样点的表层沉积物中的石油烃浓度进行了测定,结果表明广州珠江表层沉积物中的石油烃污浓度水平在288.62~725.13μg/g之间。市区南航道、后航道浓度相对较高,前航道黄埔涌口(Ⅶ号点)附近石油烃浓度已接近海洋第二类沉积物标准值;西航道至前航道和南航道、平洲水道至后航道沿程石油类浓度与有机质含量逐渐升高,说明广州市区是造成石油及有机污染的主要区域。与有机质含量及沉积物粒度的相关性分析发现,表层沉积物中石油烃浓度与有机质水平存在非常显著的正相关关系(相关系数r=0.987,P<0.01);与粘粒组分存在显著的正相关关系,相关系数(r=0.885,P<0.05),而与砂粒组分成非常显著的负相关关系(r=-0.919,P<0.01)。

Distribution Characteristics and Correlations of Petroleum Hydrocarbons in the Sediment of Pearl River,Guangzhou

Seven surface sediment samples were collected to evaluate petroleum hydrocarbons distribution in Pearl River,Guangzhou.The results tested were between 288.62~725.13 μg/g,which indicates that the petroleum hydrocarbon concentration in NanHangdao,Houhangdao are comparatively higher than other parts of the river,almost equal to the second type marine sediment quality standard.Meanwhile the Ⅶ sample near Huangpuchong is closed to the second type sediment quality criteria.From Xihangdao to Qianhangdao and Nanhangdao,Pingzhoushuidao to Houhangdao,the petroleum hydrocarbon concentration shows an steady increasing trend,which indicates that the metro area of Guangzhou city is the primary pollution source of petroleum hydrocarbons.The correlation analysis among petroleum hydrocarbon concentration,organic content and particle size distribution revealed that the concentration of hydrocarbon was significantly relevant to the levels of organic content(r=0.987,P<0.01) and fine sediment particles(r=0.885,P<0.05),while negatively correlated to the sand sediment particles(r=-0.919,P<0.01)