Second organic aerosol formation by irradiation of α-pinene-NOx-H2O in an indoor smog chamber for atmospheric chemistry and physics

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2008,（21）
• 页码范围: 3294-3300
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s 11434-008-0478-z

摘要

Ozone(O3) 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, O3 and SOA for-mation potential of α-pinene, the most abundant biogenic VOCs, is investigated at Tsinghua Indoor Chamber Facility. The experiments were conducted under atmospheric relevant HCs/NOx 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 α-pinene simultaneously. The results show that the presence of ammonia sulfate seed aerosol did not change the formation trend of O2, but significantly contribute to SOA formation. A strong linear relationship (r2=0.90) between SOA yield enhancement (△Y*) and surface concentration of seed aernsol (PMi,s)has been found, denoting that the PMi,s is the control factor for SOA yield en-hancement. And the possible reason for the enhancement is acid-catalyzed heterogeneous reactions.