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| A chamber study on isoprene - promoting the production of toluene - derived methylbutenedial in low NOx environment |
| ZHANG Yang1, HAN Shi-jie1, LI Qin-qin1, WANG Wen-lu1, XIAO Yang1, GUO Yan1, WANG Hao1,2,3, WANG Bo-guang1,2,3 |
1. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;
2. Australia-China Centre for Air Quality Science and Management (Guangdong), Guangzhou 511443, China;
3. Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China |
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Abstract Toluene and isoprene are typical anthropogenic volatile organic compounds (AVOCs) and biological volatile organic compounds (BVOCs), respectively. In this study, smog chamber experiments were carried out to simulate photochemical reactions of toluene and isoprene at low NOx levels. In order to investigate the effect of BVOCs on the chemical degradation of AVOCs during the interaction between anthropogenic and biogenic emissions, a proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS) was used to monitor the real-time concentration variations of the key gaseous substances in the mixed system. The results show that isoprene inhibited the chemical degradation of toluene, which might be related to the competitive reactions with OH radicals between isoprene and toluene. Moreover, the earlier competitive reaction began, the more significant the inhibition effect was. And isoprene enhanced the production of toluene RO2 degradation pathway products, resulting in more unsaturated 1,4-dicarbonyl compounds (Butenedial, Methyl-butenedial) and dicarbonyl compounds (Glyoxal, Methylglyoxal). The increment in methylbutenedial was up to 38.6%. Also, the RO2• generated by the rapid oxidation of isoprene had less carbon number, which may have a rapid cross-reaction with the RO2• generated by toluene oxidation. The cross reaction was conducive to the generation and cleavage of toluene RO• and ultimately led to an increase of the products from toluene RO2 • channel. This study can improve an understanding of the impact of BVOCs on AVOCs degradation during the interaction process between anthropogenic and biogenic emissions, and provide insights into regional air pollution prevention and control in the future.
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Received: 14 February 2022
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