兰州地区16种多环芳烃的长距离迁移潜力和总持久性模拟研究

使用TaPL3模型对兰州地区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)进行了模拟研究,比较了不同环数多环芳烃(PAHs)的特征迁移距离(CTD)和Pov的大小,对两者的关系进行了分析讨论,并以BaP为例对关键参数进行了灵敏度分析.研究结果表明,16种PAHs在兰州地区通过大气的特征迁移距离(CTDAir)在18.9km(BghiP)和734.9km(PYR)之间,总持久性(PovAir)在0.41d(ACE)和1304.76d(BaP)之间;通过水体的特征迁移距离(CTDWater)在511.1km(NAP)和34472.6km(BghiP)之间,PovWater在5.35d(NAP)和4156.59d(BghiP)之间.16种PAHs中,芘在空气中的LRTP最大,苯并ghi]芘在水中的LRTP最大.中、高环数PAHs的PovAir和PovWater要比低环数PAHs高.此外,CTD和Pov没有表现出直接的关系.与国外的同类研究相比,BaP在兰州地区的CTDAir明显偏低.

Simulation study on the long-range transport potential and overall persistence of 16 PAHs in Lanzhou

The long-range transport potential (LRTP) and overall persistence (Pov) of 16 polycyclic aromatic hydrocarbons (PAHs) through air and water in Lanzhou were estimated by the TaPL3 model. The characteristic travel distance (CTD) and Pov of PAHs with different rings were compared and the relationship between CTD and Pov was discussed. In addition, the key parameters were examined by sensitivity analysis method using BaP as an example. The results indicated that the CTD_Air of 16 PAHs in Lanzhou ranged from 18.9 km (BghiP) to 734.9 km (PYR), and the Pov_Air from 0.41 d (ACE) to 1304.76 d (BaP). Meanwhile, the CTD_Water ranged from 511.1 km (NAP) to 34472.6 km (BghiP), and the Pov_Water from 5.35 d (NAP) to 4156.59 d (BghiP). This case study also showed that the LRTP of PYR through air was highest, while the LRTP of BghiP through water was highest. PAHs with middle and high molecular weights exhibited higher Pov_Air and Pov_Water than those with low molecular weights. Furthermore, there was no direct association between CTD and Pov. Compared with the similar studies overseas, the CTD_Air of BaP in Lanzhou was obviously lower.