| Title: | "Effects of NO(x) and SO(2) on the secondary organic aerosol formation from the photooxidation of 1,3,5-trimethylbenzene: A new source of organosulfates" |
| Author(s): | Yang Z; Tsona NT; Li J; Wang S; Xu L; You B; Du L; |
| Address: | "Environment Research Institute, Shandong University, Qingdao, 266237, China. School of Life Science, Shandong University, Qingdao, 266237, China. Environment Research Institute, Shandong University, Qingdao, 266237, China. Electronic address: lindu@sdu.edu.cn" |
| DOI: | 10.1016/j.envpol.2020.114742 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "1,3,5-Trimethylbeneze (TMB) is an important constituent of anthropogenic volatile organic compounds that contributes to the formation of secondary organic aerosol (SOA). A series of chamber experiments were performed to probe the effects of NO(x) and SO(2) on SOA formation from TMB photooxidation. The molecular composition of TMB SOA was investigated by ultra-high performance liquid chromatography/electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry (UPLC/ESI-HR-Q-TOFMS). We found that the SOA yield increases notably with elevated NO(x) concentrations under low-NO(x) condition ([TMB](0)/[NO(x)](0) > 10 ppbC ppb(-1)), while an opposite trend is observed in high-NO(x) experiments ([TMB](0)/[NO(x)](0) < 10 ppbC ppb(-1)). The increase in SOA yield in low-NO(x) regime is attributed to the increase of NO(x)-induced OH concentrations. The formation of low-volatility species might be suppressed, thereby leading to a lower SOA yield in high-NO(x) conditions. Moreover, SOA formation was promoted in experiment with SO(2) addition. Multifunctional products containing carbonyl, acid, alcohol, and nitrate functional groups were characterized in TMB/NO(x) photooxidation, whereas several organosulfates (OSs) and nitrooxy organosulfates were identified in TMB/NO(x)/SO(2) photooxidation based on HR-Q-TOFMS analysis. The formation mechanism relevant to the detected compounds in SOA were proposed. Based on our measurements, the photooxidation of TMB in the presence of SO(2) may be a new source of OSs in the atmosphere. The results presented here also deepen the understanding of SOA formation under relatively complex polluted environments" |
| Keywords: | "Aerosols Air Pollutants/*analysis *Atmosphere Benzene Nitrogen Oxides Oxidation-Reduction Volatilization 1, 3, 5-Trimethylbenzene Organosulfates Secondary organic aerosol Sulfur dioxide;" |
| Notes: | "MedlineYang, Zhaomin Tsona, Narcisse T Li, Jianlong Wang, Shuyan Xu, Li You, Bo Du, Lin eng England 2020/05/14 Environ Pollut. 2020 Sep; 264:114742. doi: 10.1016/j.envpol.2020.114742. Epub 2020 May 5" |
