京郊灌渠水体和底泥中多环芳烃污染特征

摘要

16 priority polycyclic aromatic hydrocarbons (PAHs) listed by US Environmental Protection Agency(USEPA) were used as the goal pollutant in order to study the species,concentration and the main source of PAHs in water and sediments of irrigation canal in Tongzhou District and Daxing District.This study would not only understand the pollution status and main source of PAHs in water and sediments in suburb of Beijing,but also provide supports for management of agricultural environment and safety of agricultural products.The results showed that 16 PAHs were all detected in water and sediments of irrigation canal in Tongzhou District and their concentrations were in range of 2.19-83.02 ng/L and 52.61-785.22 μg/kg,respectively.Whereas,15 PAHs were detected in water and 13 PAHs in sediments of irrigation canal in Daxing District,and their concentrations were in range of 2.72-36.56 ng/L and 2.69-39.20 μg/kg,respectively.The total PAHs were predominant 2-3 rings in water and 4-6 rings in sediments of irrigation canal.%以美国环境保护署(USEPA)公布的16种优先控制多环芳烃(PAHs)作为目标污染物,对通州区和大兴区灌渠水体和底泥中PAHs种类、浓度进行研究,并进行源解析,以了解京郊灌渠水体和底泥中PAHs的污染现状和主要污染来源,为农业环境保护和农产品质量安全提供科学依据和数据支持.结果表明:通州区灌渠水体和底泥中16种PAHs全部检出,水体和底泥中总PAHs分别为2.19～83.02 ng/L、52.61～785.22 μg/kg;大兴区灌渠水体中检出15种PAHs,底泥中检出13种PAHs,水体和底泥中总PAHs分别为2.72～36.56 ng/L、2.69～39.20 μg/kg.灌渠水体中以2～3环PAHs为主,底泥中以4～6环PAHs为主.