FU Lu1, YANG Yuan2, WANG Yonghong2, YU Fan3, XU Peng4, LIU Hao2, FENG Peisong2
(1. Guizhou Industry Polytechnic College, Guiyang 550003;
2. Guizhou Research and Designing Institute of Environmental Sciences: Guizhou Academy of Environmental Science and Design, Guiyang 550081;
3. Guizhou Ruien Testing Technology Co., LTD, Guiyang 550014;
4. College of Resources and Environmental Engineering, Guizhou University; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang 550025)
Abstract：In order to have a deeper understanding of the roles in atmospheric chemistry of ambient volatile organic compounds (VOCs), the VOCs concentration level, chemical composition, OH reactivity, NO3 reactivity, O3 reactivity, ozone formation potential (OFP) and secondary organic aerosol formation potential (SOAP) were comprehensively characterized based on the offline observation data of VOCs in Guiyang in May 2022. The results showed that VOCs concentration, OH reactivity, NO3 reactivity, O3 reactivity, OFP and SOAP averaged 71.86±12.86 μg/m3, 3.52±1.28 s-1, 1.65×10-3±1.57×10-3 s-1, 3.87×10-7±4.31×10-7 s-1, 36.08±35.44 μg/m3 and 369.41±231.42 μg/m3, respectively, exhibiting high values during the nighttime and low values during the daytime. Alkanes were the main contributors of VOCs concentration, accounting for 38.66% of VOCs, among which high-concentration species such as acetone, dichloromethane, butyraldehyde, bromodichloromethane and trichloromethane should be focused on. OVOCs were the largest component of OH reactivity, accounting for 46.50%, alkenes were the main contributors of NO3 reactivity and O3 reactivity, accounting for 68.07% and 97.85%, respectively, and highly active species such as ethylene, propylene, n-Butyraldehyde, isoprene, butylene, cis-2-Butene and trans-2-Butene should attract more attention. OVOCs and aromatics were the main contributing species of OFP and SOAP, respectively, accounting for 48.18% and 78.92%, with major OFP contribution components such as n-Butanal, ethylene, acetaldehyde and butene, and major SOAP contribution components such as aromatics species, benzaldehyde and n-Dodecane. Backward trajectory studies found that, to further reduce O3 and particulate pollution in Guiyang, VOCs control policies should focus on the eastern and northern regions of Guiyang.
Key words：VOCs; OH reactivity; ozone formation potential; secondary organic aerosol formation potential; Guiyang
EARTH AND ENVIRONMENT Vol.50, No.6, Tot No.350, 2022, Page 863
