Characteristics of particulate PAHs during a typical haze episode in Guangzhou, China
Characteristics of particulate PAHs during a typical haze episode in Guangzhou, China
复制标题
DOI：
10.1016/j.atmosres.2011.06.012
复制
发表时间：
2011-10
影响因子：
5.5
通讯作者：
Jihua Tan;Songjun Guo;Yong-liang Ma;Jing-chun Duan;Yuan Cheng;K. He;Fumo Yang
中科院分区：
文献类型：
--
作者：
Jihua Tan;Songjun Guo;Yong-liang Ma;Jing-chun Duan;Yuan Cheng;K. He;Fumo Yang
对广州市一次典型雾霾过程中PM2.5和TSP中多环芳烃(PAHs)的浓度进行了测定。包括NH(非灰霾，3天)、HFN(北方和东北气团灰霾，6天)和HFS(南方气团灰霾，4天)。HFN的空气质量明显差于NH和HFS。PM2.5中多环芳烃的总平均浓度分别为13.25ngm−3、59.82ngm−3和13.09ngm−3。结果表明，HFN显著加重了多环芳烃的污染。在HFN和HFS中，PAHs(5+6)含量最丰富，占PAHs总浓度的55~75%；而在NH中，PAHs(3+4)含量最丰富，占PAHs总浓度的54~67%。经TEF(毒性当量因子)调整后的13种颗粒物多环芳烃在HFN中的浓度非常高，表明在HFN中暴露多环芳烃对人类健康有很高的风险。多环芳烃的特征比值表明，燃煤和交通排放是HFN和HFS中PAHs的主要贡献者。灰霾过程中颗粒多环芳烃的浓度受风速和风向的影响较大。NH中的多环芳烃可能来自北风大风速的长距离输送，而局地排放可能是HFN中与颗粒物相关的PAHs的主要贡献者。研究发现，气团的输送速度对多环芳烃浓度有重要影响。
The concentrations of polycyclic aromatic hydrocarbons (PAHs) in PM2.5and TSP were measured in Guangzhou during a typical haze episode. This episode included NH (non-haze, 3days), HFN (haze when air masses from north and northeast, 6days) and HFS (haze when air masses from south, 4days). The air quality in HFN was much worse than that in NH and HFS. The total average concentrations of PAHs in PM2.5were 13.25ngm−3, 59.82ngm−3and 13.09ngm−3in NH, HFN and HFS, respectively. It indicated PAH pollution had been substantially aggravated by HFN. PAHs(5+6) were the most abundant compounds in HFN and HFS, which accounted for 55–75% of total concentration of PAHs, while PAHs(3+4) were the most abundant compounds in NH, which accounted for 54–67% of total concentration of PAHs. TEF (Toxic Equivalency Factors)-adjusted concentrations of 13 particulate PAHs were very high in HFN, indicating high health risks to humans for PAH exposure in HFN. The characteristic ratios of PAHs indicated coal combustion and traffic emission were the major contributors to PAHs in HFN and HFS. The concentrations of particulate PAHs in haze episode were strongly affected by wind speed and wind direction. PAHs in NH could be from long-range transport with high north wind speed, while local emission could be the main contributor of particle-associated PAHs in HFN. The transport speed of air masses was found to play an important role on PAH concentrations.