Hao Li-qing, Wang Zhen-ya, Huang Ming-qiang, Pei Shi-xin, Yang Yong, Zhang Wei-jun
Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
J Environ Sci (China). 2005;17(6):912-6.
In a smog chamber, the photooxidation of toluene was initiated by hydroxyl radical (OH*) under different experimental conditions. The size distribution of secondary organic aerosol(SOA) particles from the above reaction was measured using aerodynamic particle sizer spectrometer. It was found from our experimental results that the number of SOA particles increased with increasing the concentration of toluene. As the reaction time prolonged, the sum of SOA particles was also increased. After a reaction time of 130 min, the concentration of secondary organic aerosol particles would be kept constant at 2300 particles/cm3. Increasing illumination power of blacklamps could significantly induce a higher concentration of secondary organic aerosol particle. The density of SOA particles would also be increased with increasing concentration of CH3 ONO, however, it would be decreased as soon as the concentration of CH3 ONO was larger than 225.2 ppm. Nitrogen oxide with initial concentration higher than 30.1 ppm was also found to have little effect on the formation of secondary organic aerosol.
在烟雾箱中，在不同实验条件下，甲苯的光氧化反应由羟基自由基（OH*）引发。使用空气动力学粒径谱仪测量上述反应产生的二次有机气溶胶（SOA）颗粒的粒径分布。从我们的实验结果发现，SOA颗粒的数量随着甲苯浓度的增加而增加。随着反应时间的延长，SOA颗粒的总数也增加。反应130分钟后，二次有机气溶胶颗粒的浓度将保持在2300个颗粒/立方厘米不变。增加黑光灯的光照强度可显著诱导产生更高浓度的二次有机气溶胶颗粒。SOA颗粒的密度也会随着CH3ONO浓度的增加而增加，然而，一旦CH3ONO的浓度大于225.2 ppm，其密度就会下降。还发现初始浓度高于30.1 ppm的氮氧化物对二次有机气溶胶的形成影响很小。
