作　　者： (高佳佳）; (罗维）;

机构地区： 西藏自治区气候中心,拉萨850000 中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085

出　　处： 《农业环境科学学报》 2017年第8期1601-1609,共9页

摘　　要： 利用Ta PL3模型模拟洋河流域16种PAHs通过大气和水体的长距离迁移潜力(LRTP)和总持久性(Pov),比较不同单体PAHs的特征迁移距离(CTD)和Pov的大小,探讨它们之间的关系,并以Ba P为例对模型的关键参数进行了灵敏度分析。结果表明:排放到大气中的PAHs的特征迁移距离(CTDair)在13 km(DBA)~712 km(Flu)之间,总持久性(Pov-air)在0.33 d(Acy)~907 d(Ba P)之间,土壤相是大气中PAHs的主要归宿,约占60%;排放到水体中的CTDwater在111 km(Flu)~2512 km(Pyr)之间,Pov-water在4.5 d(Nap)~3293 d(Bghi P)之间,沉积物相是水体中PAHs的主要归宿,占4%。风速和土壤PAHs的半衰期是影响大气中PAHs的CTD和Pov的主要参数,水体流速和辛醇-水分配系数是影响水体中PAHs的CTD和Pov的主要参数。洋河流域的PAHs具有远距离迁移的潜力,可对北京的生态环境产生威胁,建议流域相关企业采取PAHs污染减排措施以防治PAHs区域环境污染及其对首都生态环境和健康的潜在危害。 The long-range transport potential（LRTP）and overall persistence（Pov）of 16 PAHs in air and water within the Yanghe Watershed were estimated using the Transport and Persistence Level Ⅲ（Ta PL3）model. Characteristic travel distances（CTDs）and Povs of PAH isomers were compared and the relationships between the CTDs and the Povs were discussed. Key parameters of the model were validated using a case study of sensitivity analysis of the parameters influencing CTDs and Povs of benzopyrene（Ba P）. Results indicated that the CTD of 16 PAHs in air ranged from 13 km（DBA）to 712 km（Flu）and the Pov-airfrom 0.33 d（Acy）to 907 d（Ba P）. Soil was the main sink of PAHs in air, which accounted for about 60 percent of total PAHs in air. The CTD of 16 PAHs in water ranged from 111 km（Flu）to 2512 km（Pyr）,and the Pov-water ranged from 4.5 d（Nap）to 3293 d（Bghi P）. Sediment was the main sink of PAHs in water, which accounted for about 4percent of total PAHs in water. Wind flow velocity and half-life of PAHs in soil were the two key parameters influencing CTDairand Pov-air.Water flow velocity and octanol-water partition coefficient（Kow）were the key parameters influencing CTDwaterand Pov-water. Considering the great CTDs of PAHs and their potential danger to environments and ecosystems of Beijing, PAH abatement measures should be taken by PAH-related key enterprises within the Yanghe Watershed in the future.

关 键 词： 模型 多环芳烃 长距离迁移潜力 总持久性