title: Distributions, sources, and backward trajectories of atmospheric polycyclic aromatic hydrocarbons at Lake Small Baiyangdian, Northern China.
abstract: Air samples were collected seasonally at Lake Small Baiyangdian, a shallow lake in northern China, between October 2007 and September 2008. Gas phase, particulate phase and dust fall concentrations of polycyclic aromatic hydrocarbons (PAHs) were measured using a gas chromatograph-mass spectrometer (GC-MS). The distribution and partitioning of atmospheric PAHs were studied, and the major sources were identified; the backward trajectories of air masses starting from the center of Lake Small Baiyangdian were calculated for the entire year. The following results were obtained: (1) The total concentration of 16 priority controlled PAHs (PAH16) in the gas phase was 417.2 ± 299.8 ng · m(-3), in the particulate phase was 150.9 ± 99.2 ng · m(-3), and in dust fall was 6930.2 ± 3206.5 ng · g(-1). (2) Vehicle emission, coal combustion, and biomass combustion were the major sources in the Small Baiyangdian atmosphere and accounted for 28.9%, 45.1% and 26.0% of the total PAHs, respectively. (3) Winter was dominated by relatively greater PAHs polluted northwesterly air mass pathways. Summer showed a dominant relatively clean southern pathway, whereas the trajectories in autumn and spring might be associated with high pollution from Shanxi or Henan province.
authors.affiliation: MOE Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Qin
authors.forename: Xiang-Zhen
authors.initials: XZ
authors.lastname: Kong
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: He
authors.forename: Qi-Shuang
authors.initials: QS
authors.lastname: He
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.forename: Hui-Ling
authors.initials: HL
authors.lastname: Ou-Yang
authors.forename: Wen-Xiu
authors.initials: WX
authors.lastname: Liu
authors.forename: Qing-Mei
authors.initials: QM
authors.lastname: Wang
authors.forename: Fu-Liu
authors.initials: FL
authors.lastname: Xu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000032:analysis* / Q000737:chemistry*; D002681:China; D060106:Lakes / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D012621:Seasons
chemical_list: D000393:Air Pollutants; D011084:Polycyclic Aromatic Hydrocarbons