Song Shi-Jie, Huang Tao, Zhao Liu-Yuan, Mao Xiao-Xuan, Mu Xi, Gao Hong, Ma Jian-Min
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):558-566. doi: 10.13227/j.hjkx.201806153.
Passive air samplers (PAS-PUF) and passive dry deposition (PAS-DD) samplers were applied in the Bosten Lake watershed located in Xinjiang to estimate the atmospheric concentrations and dry deposition fluxes for 15 US EPA priority polycyclic aromatic hydrocarbons (PAHs) during a heating period in 2016 and no-heating period in 2017, respectively. The results showed that the atmospheric PAHs concentrations in the Bosten oasis area ranged from 6.38 ng·m to 245.43 ng·m during the heating period and 2.33 ng·m to 74.76 ng·m during the non-heating period. The highest atmospheric PAHs concentrations were found in the residential area, followed by regions near Bosten Lake and Tazhong. The atmospheric dry deposition fluxes of PAHs in the Bosten Lake watershed ranged from 0.45 μg·(m·d) to 18.10 μg·(m·d) during the heating period and 0.25 μg·(m·d)to 8.15 μg·(m·d) during the non-heating period. During the heating period, the atmospheric dry deposition fluxes in the residential area were significantly higher than those in the regions near Bosten Lake and Tazhong. However, the atmospheric PAHs dry deposition flux in Tazhong was much higher than that in other sites during the heating and no-heating periods. In general, the atmospheric PAHs dry deposition fluxes during the heating period were significantly higher than those during the non-heating period. PAH composition for the atmosphere and dry deposition were dominated by 3 and 4 ring congeners, especially by phenanthrene, fluorine, fluoranthene, and pyrene during two sampling periods. In addition, the congener diagnostic ratio shows that coal and biomass combustion were possible sources of atmospheric PAHs in the Bosten Lake watershed. The forward and backward trajectory analysis based on the HYSPLIT model demonstrated that the higher atmospheric PAH emissions from the residential area would be transported to Bosten Lake, which can affect the aquatic environment of this lake by dry deposition.
被动空气采样器（PAS-PUF）和被动干沉降采样器（PAS-DD）被应用于新疆的博斯腾湖流域，分别用于估算2016年供暖期和2017年非供暖期15种美国环保署优先控制的多环芳烃（PAHs）的大气浓度和干沉降通量。结果表明，博斯腾绿洲地区供暖期大气PAHs浓度范围为6.38 ng·m至245.43 ng·m，非供暖期为2.33 ng·m至74.76 ng·m。大气PAHs浓度最高值出现在居民区，其次是博斯腾湖附近地区和塔中地区。博斯腾湖流域PAHs的大气干沉降通量在供暖期为0.45 μg·(m²·d)至18.10 μg·(m²·d)，非供暖期为0.25 μg·(m²·d)至8.15 μg·(m²·d)。供暖期，居民区的大气干沉降通量显著高于博斯腾湖附近地区和塔中地区。然而，在供暖期和非供暖期，塔中的大气PAHs干沉降通量均远高于其他站点。总体而言，供暖期的大气PAHs干沉降通量显著高于非供暖期。大气和干沉降中的PAH组成以三环和四环同系物为主，尤其是在两个采样期内以菲、芴、荧蒽和芘为主。此外，同系物诊断比值表明，煤炭和生物质燃烧可能是博斯腾湖流域大气PAHs的来源。基于HYSPLIT模型的前后向轨迹分析表明，居民区较高的大气PAH排放将传输至博斯腾湖，通过干沉降影响该湖的水生环境。
