title: Effects of seed aerosols on the growth of secondary organic aerosols from the photooxidation of toluene.
abstract: 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.
authors.affiliation: Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. hlqing@aiofm.ac.cn
authors.forename: Li-qing
authors.initials: LQ
authors.lastname: Hao
authors.forename: Zhen-ya
authors.initials: ZY
authors.lastname: Wang
authors.forename: Ming-qiang
authors.initials: MQ
authors.lastname: Huang
authors.forename: Li
authors.initials: L
authors.lastname: Fang
authors.forename: Wei-jun
authors.initials: WJ
authors.lastname: Zhang
mesh_terms: D000336:Aerosols; D000393:Air Pollutants / Q000737:chemistry / Q000528:radiation effects; D000645:Ammonium Sulfate / Q000737:chemistry / Q000528:radiation effects; D002122:Calcium Chloride / Q000737:chemistry / Q000528:radiation effects; D009566:Nitrates / Q000737:chemistry / Q000528:radiation effects; D009569:Nitric Oxide / Q000737:chemistry / Q000528:radiation effects; D009573:Nitrites / Q000737:chemistry / Q000528:radiation effects; D010084:Oxidation-Reduction; D017640:Silicates / Q000737:chemistry / Q000528:radiation effects; D014050:Toluene / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D009566:Nitrates; D009573:Nitrites; D017640:Silicates; D009569:Nitric Oxide; D014050:Toluene; C037538:methyl nitrite; C005691:sodium silicate; D002122:Calcium Chloride; D000645:Ammonium Sulfate; C006568:ammonium nitrate