Song Chen, Na Kwangsam, Cocker David R
Bourns College of Engineering--Center for Environmental Research and Technology, and Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, California 92521, USA.
Environ Sci Technol. 2005 May 1;39(9):3143-9. doi: 10.1021/es0493244.
A series of m-xylene/NOx experiments were conducted in the new Bourns College of Engineering-Center for Environmental Research and Technology dual 90 m3 indoor smog chamber to elucidate the role of NOx on the secondary organic aerosol (SOA) formation potential of m-xylene. The results presented herein demonstrate a clear dependence of m-xylene SOA formation potential on NOx, particularly at atmospherically relevant organic aerosol concentration. Experiments with lower NOx levels generated considerably more organic aerosol mass than did experiments with higher NOx levels when reacted m-xylene was held constant. For example, SOA formation from approximately 150 microg m(-3) reacted m-xylene produced 0.6-9.3 microg m(-3) aerosol mass for NOx concentrations ranging from 286 to 10 ppb. The increase in SOA formation was not attributable to changes in ozone and nitrate concentration. A general discussion about possible influences of NOx on SOA formation for this system is included.
在新成立的伯恩斯工程学院环境研究与技术中心的双90立方米室内烟雾箱中进行了一系列间二甲苯/氮氧化物实验，以阐明氮氧化物对间二甲苯二次有机气溶胶（SOA）生成潜力的作用。本文给出的结果表明，间二甲苯SOA生成潜力明显依赖于氮氧化物，特别是在与大气相关的有机气溶胶浓度条件下。当反应的间二甲苯保持恒定时，较低氮氧化物水平的实验比较高氮氧化物水平的实验产生了更多的有机气溶胶质量。例如，对于浓度范围为286至10 ppb的氮氧化物，由约150微克/立方米反应的间二甲苯生成的SOA产生了0.6 - 9.3微克/立方米的气溶胶质量。SOA生成的增加并非归因于臭氧和硝酸盐浓度的变化。文中还包括了关于该系统中氮氧化物对SOA生成可能影响的一般性讨论。
