The contribution of traffic to atmospheric concentrations of polycyclic aromatic hydrocarbons
The contribution of traffic to atmospheric concentrations of polycyclic aromatic hydrocarbons
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DOI：
10.1021/es990392d
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发表时间：
1999-10-15
影响因子：
11.4
通讯作者：
Harrad, S
中科院分区：
文献类型：
--
作者：
Lim, LH;Harrison, RM;Harrad, S
即将出台的有关大气多环芳烃浓度的立法加强了确定其来源的努力。于1996年12月5日6点至20点，在英国伯明翰市中心一个交通繁忙的地点每2小时测量一次颗粒相多环芳烃（PAH）， 18种PAH中有17种浓度与CO和NOX浓度显著相关（大于或等于95%置信水平）。利用COPAH和NOX-PAH线性回归方程估计，在该采样事件中，4-7环的PAH分别有71%（59-87%）和59%（47-81%）来自交通。在1997年7月15日至1997年9月12日的每周间隔时间内，在同一市中心位置和距离市中心西南约3公里、距离最近的繁忙道路约500米的校园地点，同时进行了24小时的颗粒相多环芳烃监测。因此，多环芳烃浓度的站点间差异应主要由交通排放的差异引起。以B[e]P为指标，交通对城市中心和校园4-7环多环芳烃浓度的贡献分别为80-82%和61-67%。利用西格玛甲基菲/菲的比值，估计市中心交通排放的总多环芳烃中有60-84%来自柴油车。
Impending legislation pertaining to atmospheric PAH concentrations has intensified efforts to identify their sources. Particulate-phase PAH were measured every 2 h between 06.00 and 20.00 on 12/5/96 at a heavily trafficked location in the center of Birmingham, U.K. Concentrations of 17 out of 18 PAH were significantly correlated (greater than or equal to 95% confidence level) to those of CO and NOX. Using the COPAH and NOX-PAH linear regression equations, it is estimated that during this sampling event 71% (59-87%) and 59% (47-81%), respectively, of 4-7 ring PAH originated from traffic. At weekly intervals between 7/15/97 and 12/9/97, simultaneous monitoring of particulate-phase PAH was conducted over 24 h periods at the same city center location, and a campus site ca. 3 km southwest of the city center, and ca. 500 m from the nearest busy road. Intersite differences in PAH concentrations should thus arise primarily from differences in traffic emissions. Using B[e]P as an indicator, the contribution of traffic to concentrations of 4-7 ring PAH at the two sites was estimated at 80-82% and 61-67% for the city center and campus sites, respectively. Utilizing ratios of Sigma methyl phenanthrenes/phenanthrene, an estimated 60-84% of total PAH traffic emissions at the city center site originated from diesel vehicles.