Spatial and temporal distribution of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere of Xiamen, China.
Spatial and temporal distribution of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere of Xiamen, China.
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DOI：
10.1016/j.scitotenv.2011.08.024
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
Jin-ping Zhao;Fuwang Zhang;Lingling Xu;Jinsheng Chen;Ya Xu
中科院分区：
文献类型：
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作者：
Jin-ping Zhao;Fuwang Zhang;Lingling Xu;Jinsheng Chen;Ya Xu
于2008年10月至2009年9月在福建省厦门市5个不同环境点进行了密集采样，研究了气相和颗粒相中多环芳烃(PAHs)的空间和时间特征。不同地点的PAHs浓度在四季之间存在较大差异。冬季PAHs平均浓度是春季的8.4倍，背景浓度比工业区低0.56倍。此外，夏季较高的温度影响了多环芳烃的颗粒/气体分配，导致气态多环芳烃浓度较高。用多环芳烃诊断率来指示厦门市多环芳烃的主要来源，结果表明，交通车辆尾气是厦门市尤其是城市地区多环芳烃的最大贡献者和主要来源，而工业区的多环芳烃来源主要是静态燃烧过程，如石化厂和发电厂。在五个采样点中，颗粒相的多环芳烃的健康风险均高于气相。春季、夏季、秋季和冬季苯并[a]芘的平均毒性当量(BaPeq)分别为0.14、0.32、1.38和3.59 ngm−3。此外，四季平均BaPeqin的结果表明，不同采样点颗粒态多环芳烃的健康风险高于气态多环芳烃。
An intensive sampling program was conducted from October 2008 to September 2009 at the five different environmental sites in Xiamen, Fujian Province, to study the spatial and temporal characteristics of Polycyclic Aromatic Hydrocarbons (PAHs) in the gaseous and particulate phase, respectively. The PAHs concentrations at different sites were quite distinct during four seasons. The average concentrations of PAHs in winter were about 8.4 times higher than those in spring, and the concentrations of background were 0.56 times lower than those of industrial area. In addition, the higher temperature in summer affected the particle/gas partitioning of PAHs and led to the higher concentrations of gaseous PAHs. Diagnostic ratios of PAHs, which were employed to indicate the primary sources of PAHs in Xiamen, showed that the traffic vehicle exhaust was the largest contributor and the primary source for PAHs in Xiamen, especially in urban area; while the stationary combustion processes, such as petrochemical factories and power plants, were mainly responsible for PAHs sources in the industrial areas. The health risk of PAHs in the particulate phase was higher than those of the gaseous phase at the five sampling sites. The average toxic equivalent (BaPeq) of the benzo[a]pyrene values for PAHs were 0.14, 0.32, 1.38 and 3.59ngm−3in spring, summer, autumn and winter, respectively. Furthermore, the results of average BaPeqin all four seasons indicated that the health risks of particulate PAHs were higher than those of the gaseous PAHs at different sampling sites.