Air quality model evaluation data for organics .4. C-2-C-36 non-aromatic hydrocarbons
Air quality model evaluation data for organics .4. C-2-C-36 non-aromatic hydrocarbons
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DOI：
10.1021/es960980g
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发表时间：
1997-08-01
影响因子：
11.4
通讯作者：
Rasmussen, RA
中科院分区：
文献类型：
--
作者：
Fraser, MP;Cass, GR;Rasmussen, RA
在严重的洛杉矶地区光化学烟雾事件期间收集的36个样品（32个城市和4个背景）中，143种非芳烃的浓度进行了定量。气相，半挥发性和颗粒相有机化合物被认为是同时跨越碳数范围从C-2到C-36。研究的化合物类别包括正烷烃、支链烷烃、正烯烃、支链烯烃、二烯烃、炔烃、饱和环烃、不饱和环烃、生物烃、石油生物标志物以及半挥发性和颗粒相有机物样品中所含的未溶解的复杂混合物。正构烷烃的丰度几乎呈指数福尔斯，增加正构烷烃的碳数，和正构烷烃的气相和颗粒相之间的分布遵循蒸汽/颗粒分配理论。个别低分子量烯烃的浓度下降，在整个城市地区的运输过程中，在大约预期的顺序考虑到它们的初始速率与羟基自由基的反应。1982年至1993年期间，作为车辆废气排放的颗粒有机物示踪剂的石油生物标志物浓度大幅下降，反映了装有催化剂的汽车在车队中的渗透率增加。在1987年和1993年之间汽相非芳烃浓度的最显著变化是汽油的最轻调合组分（例如，丁烷），反映了限制汽油的里德蒸气压的新规定。
The concentrations of 143 non-aromatic hydrocarbons are quantified in 36 samples (32 urban and 4 background) collected during a severe Los Angeles area photochemical smog episode. Gas phase, semivolatile, and particle phase organic compounds are viewed simultaneously across the carbon number range from C-2 to C-36. Compound classes studied include the n-alkanes, branched alkanes, n-alkenes, branched alkenes, diolefins, alkynes, saturated cyclic hydrocarbons, unsaturated cyclic hydrocarbons, biogenic hydrocarbons, petroleum biomarkers, and the unresolved complex mixture contained within the semivolatile and particle phase organics samples. The abundance of the n-alkanes falls almost exponentially with increasing n-alkane carbon number, and the distribution of the n-alkanes between the gas and particle phases follows vapor/particle partitioning theory. The concentrations of individual low molecular weight alkenes decline during transport across the urban area in about the order expected given their initial rates of reaction with the hydroxyl radical. Petroleum biomarker concentrations that act as tracers for particulate organics emitted from vehicle exhaust have declined substantially between 1982 and 1993, reflecting the increased penetration of catalyst-equipped cars into the vehicle fleet. The most pronounced change in vapor phase non-aromatic hydrocarbons concentrations between 1987 and 1993 is a reduction in the concentration of the lightest blending components of gasoline (e.g., butanes), reflecting new regulations that limit the Reid vapor pressure of gasoline.