北京燕山河沉积物中多环芳烃分布规律及来源分析

PAHs’Distribution and Source Analysis on River Sediments in Yanshan Area of Beijing

采用GC/MS法分析了北京燕山河沉积物中多环芳烃的含量及其来源。结果显示:在这些沉积物样中,18种多环芳烃的含量分布范围在0.3476～4.4781mg/kg之间,平均为2.6675mg/kg,主要特征是在近排污口处含量最大,远离排污口的源头含量较低。除了SA采样点沉积物中多环芳烃含量相对较低外,其余采样点多环芳烃分布均匀且含量较高,显著高于长江南京段、辽河及台湾高平等河流含量。对多环芳烃特征组分的比值(荧蒽/芘(F/Py)、苯并(a)蒽/(苯并(a)蒽+■)(BaA/(BaA+Cy))及甲基菲与菲的比值分析表明:该河流表层沉积物的多环芳烃主要来源于原油污染。

The purpose of the paper is to analyze the level and source of Yanshan river sediment of Beijing.The analysis of PAHs in 4 surface river sediments in suburb of Beijng showed that total PAHs concentration ranged from 0.3476 to 4.4781mg/kg. The degree of sediment contamination by PAHs in study area was moderate/high in comparison with other internal and external estuarines such as Yangtze River,Liao River and Gaoping River of Taiwan.The contents of total PAHs varied dramatically with the sampling region.They are characterized by greatest content near sewage discharge point thet decrease far from sewage discharge point.Petroleum-derived contamination may be dominant source in the study area depending on the distribution of fluoranthene/pyren(F/Py),benzo(a)anthracene/ (benzo(a)anthracene +chrysene)(BaA/ (BaA +Cy)),MP/P.