Second organic aerosol formation by irradiation of alpha-pinene-NO(x)-H(2)O in an indoor smog chamber for atmospheric chemistry and physics

作者：Zhao Zhe; Hao JiMing^*; Li JunHua; Wu Shan

来源：Chinese Science Bulletin, 2008, 53(21): 3294-3300.

DOI：10.1007/s11434-008-0478-z

• alpha-pinene
• photo-oxidation
• SOA
• chamber experiment
• seed particles

Ozone(O(3)) and secondary organic aerosol (SOA) are considered to be the most serious secondary air pollutants of concern in most metropolitan areas, as well as for Beijing. In this study, O(3) and SOA formation potential of alpha-pinene, the most abundant biogenic VOCs, is investigated at Tsinghua Indoor Chamber Facility. The experiments were conducted under atmospheric relevant HCs/NO(x) ratios in both presence and absence of ammonia sulfate seed aerosol. A Scanning Mobility Particle Sizer system (3936, TSI) and a Condensation Particle Counter (3010, TSI) were used to study the SOA formation and a gas chromatograph (GC) equipped with a DB-5 column and a flame ionization detector (FID) was used to measure alpha-pinene simultaneously. The results show that the presence of ammonia sulfate seed aerosol did not change the formation trend of O(3), but significantly contribute to SOA formation. A strong linear relationship (r(2) = 0.90) between SOA yield enhancement (Delta Y*) and surface concentration of seed aerosol (PM (i,s) )has been found, denoting that the PM(i,s) is the control factor for SOA yield enhancement. And the possible reason for the enhancement is acid-catalyzed heterogeneous reactions.

• 出版日期2008-11
• 单位清华大学