北京市通州区河流悬浮物中多环芳烃的分布特征

Distribution Characteristics of Polycyclic Aromatic Hydrocarbons in the Suspend Particle of Rivers from Tongzhou District of Beijing

2005年7月—2006年3月用GC-MS内标定量法检测了北京市通州区23个采样点河流悬浮物样品中16种优控多环芳烃(PAHs)含量,并探讨了研究区域悬浮物中PAHs的分布特征.结果表明,通州河流悬浮物中w(PAHs)为1 160.60～27 653.72ng/g,其中12月最高,10月最低;不同河流之间悬浮物中PAHs含量的差异较大,其中北运河通州河段悬浮物PAHs污染源分布较多;悬浮物中16种PAHs以3环PAH为优势组分,3环及3环以下PAH占PAHs的70%左右;采样点PAHs含量与4环PAH含量有显著的正相关关系,回归分析得到相关度很高的一元线性关系式.

Twenty-three suspended particle samples from the rivers in Tongzhou District of Beijing were collected from July 2005 to March 2006. 16 PAHs compounds in the samples were measured with GC-MS for analysis of the distribution characteristic. Total PAHs concentrations varied from 1 160.60 to 27 653.72 ng/g. The highest and lowest concentrations were found in December and October. The concentration of PAHs in the suspended particles from different rivers varied greatly, and there are more sources of PAHs distributed in the Beiyun River than other rivers in the study area. The dominated compounds are three-ring PAH. The three and less ring PAils compounds are up to almost 70% . Unitary linear regression method shows that the concentrations of PAHs have distinct correlativity with the concentrations of 4-rings-PAH.