Increased primary and secondary H 2SO 4 showing the opposing roles in secondary organic aerosol formation from ethyl methacrylate ozonolysis

Zhang, Peng; Chen, Tianzeng; Liu, Jun; Xu, Guangyan; Ma, Qingxin; Chu, Biwu; Sun, Wanqi; He, Hong

Stressed plants and polymer production can emit many unsaturated volatile organic esters (UVOEs). However, secondary organic aerosol (SOA) formation of UVOEs remains unclear, especially under complex ambient conditions. In this study, we mainly investigated ethyl methacrylate (EM) ozonolysis. Results showed that a substantial increase in secondary inline-formulaH2SO4 particles promoted SOA formation with increasing inline-formulaSO2. An important reason was that the homogeneous nucleation of more inline-formulaH2SO4 at high inline-formulaSO2 level provided greater surface area and volume for SOA condensation. However, increased primary inline-formulaH2SO4 with seed acidity enhanced EM uptake but reduced SOA formation. This was ascribed to the fact that the ozonolysis of more adsorbed EM was hampered with the formation of surface inline-formulaH2SO4 at higher particle acidity. Moreover, the increase in secondary inline-formulaH2SO4 particle via homogeneous nucleation favored to the oligomerization of oxidation products, whereas the increasing of primary inline-formulaH2SO4 with acidity in the presence of seed tended to promote the functionalization conversion products. This study indicated that the role of increased inline-formulaH2SO4 to EM-derived SOA may not be the same under different ambient conditions, which helps to advance our understanding of the complicated roles of inline-formulaH2SO4 in the formation of EM-derived SOA.

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Zhang, Peng / Chen, Tianzeng / Liu, Jun / et al: Increased primary and secondary H2SO4 showing the opposing roles in secondary organic aerosol formation from ethyl methacrylate ozonolysis. 2021. Copernicus Publications.

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