Effects of NOx, SO2 and RH on the SOA formation from cyclohexene photooxidation.

作者: Chen Lv , Lin Du , Shijie Liu , Xiaotong Jiang , Narcisse T. Tsona

DOI: 10.1016/J.CHEMOSPHERE.2018.10.180

关键词: SulfateAnalytical chemistryMass spectrometryChemistryCyclohexeneYield (chemistry)Chemical compositionNOxElectrospray ionizationRelative humidity

摘要: Abstract We performed a laboratory investigation of the secondary organic aerosol (SOA) formation from cyclohexene photooxidation with different initial NOx and SO2 concentrations at low high relative humidity (RH). Both SOA yield number concentration first increase drastically then, decreased when [VOC]0/[NOx]0 ratio changed 30 to 10 3. Though presence could concentration, only under [VOC]0/[NOx]0 = 10 RH, [VOC]0/[NOx]0 = 3 RH experimental conditions, while decreasing conditions. In SO2, conditions were keys efficient sulfate promote formation. The chemical composition was characterized using hybrid quadrupole-orbitrap mass spectrometer equipped electrospray ionization (ESI-Q-Orbitrap-HRMS), few organosulfates identified. A visible enhancement molecular weight compounds observed this seemed be reason for RH.

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