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| A chamber study of gas-phase products formation by isoprene nocturnal ozonolysis |
| TAN Yan1, ZHANG Yu-jia1, LIU Xiao1, LIU Ting1, MA Zi-zhen1, ZHANG Hua-wei1, LEE Shun-cheng2 |
1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China;
2. Earth, Ocean and Atmospheric Sciences (EOAS) Thrust, Function Hub, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 511453, China |
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Abstract A chamber experiment was conducted simulate the nighttime ozone oxidation process of isoprene. The concentration changes of gas-phase products in the isoprene-ozone reaction system were monitored in real-time using proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS). Furthermore, the production process of secondary organic aerosols (SOA) was assessed in real-time through scanning mobility particulate size spectrometry (SMPS). The findings revealed that under the conditions of a reaction temperature of (298 ±1) K and a relative humidity of 30%, isoprene was consumed by ozone, resulting in the formation of SOA. The concentration of SOA peaked at 3.14µg/m3 approximately 4 hours into the reaction. The main gas-phase products of the nighttime ozone oxidation reaction of isoprene were oxygenated volatile organic compounds (OVOCs) ranging from C1 ~ C4, including formaldehyde (HCHO), formic acid (CH2O2), acetic acid (C2H4O2), acetone (C3H6O), propionic acid (C3H6O2), methacrolein (MACR), methyl vinyl ketone (MVK), and methacrylic acid (C4H6O2), and the yields of these products varied with the ratio of ozone to isoprene. Notably, HCHO and MACR + MVK exhibited the highest yields among all oxidation products. When the ozone/isoprene ratio ranged from 0.5 to 6.8, the yield ranges were 17.0% to 35.6% for HCHO and 59.3% to 89.5% for MACR + MVK. Additionally, NO2 was found to inhibit the production of HCHO and MACR + MVK, while other OVOCs displayed a mild negative correlation with increasing NO2 concentrations. The nighttime oxidation of isoprene plays a significant role in the formation of OVOCs and SOA.
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Received: 16 March 2024
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