Hao Li-qing, Wang Zhen-ya, Huang Ming-qiang, Fang Li, 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). 2007;19(6):704-8. doi: 10.1016/s1001-0742(07)60117-x.
Hydroxyl radical (.OH)-initiated photooxidation reaction of toluene was carried out in a self-made smog chamber. Four individual seed aerosols such as ammonium sulfate, ammonium nitrate, sodium silicate and calcium chloride, were introduced into the chamber to assess their influence on the growth of secondary organic aerosols (SOA). It was found that the low concentration of seed aerosols might lead to high concentration of SOA particles. Seed aerosols would promote rates of SOA formation at the start of the reaction and inhibit its formation rate with prolonging the reaction time. In the case of ca. 9000 pt/cm3 seed aerosol load, the addition of sodium silicate induced a same effect on the SOA formation as ammonium nitrate. The influence of the four individual seed aerosols on the generation of SOA decreased in the order of calcium chloride>sodium silicate and ammonium nitrate>ammonium sulfate.
在自制的烟雾箱中进行了羟基自由基（·OH）引发的甲苯光氧化反应。将硫酸铵、硝酸铵、硅酸钠和氯化钙这四种单一种子气溶胶引入该烟雾箱，以评估它们对二次有机气溶胶（SOA）生长的影响。研究发现，低浓度的种子气溶胶可能导致SOA颗粒的高浓度。种子气溶胶在反应开始时会促进SOA的形成速率，但随着反应时间的延长会抑制其形成速率。在种子气溶胶负载量约为9000 pt/cm³的情况下，添加硅酸钠对SOA形成的影响与硝酸铵相同。四种单一种子气溶胶对SOA生成的影响按氯化钙>硅酸钠和硝酸铵>硫酸铵的顺序递减。
