生态环境学报2026，Vol.35Issue(1)：112-123,12.DOI:10.16258/j.cnki.1674-5906.2026.01.010
基于NO+PTR-QMS在线观测评估广州市夏季大气VOCs的光化学损失及二次环境效应
Photochemical Loss and Secondary Environmental Effects of Summer Atmospheric VOCs in Guangzhou:An Assessment via NO+PTR-QMS Online Observations
摘要
Abstract
Volatile organic compounds(VOCs)are key precursors of ozone(O3)and secondary organic aerosols(SOA)and play a crucial role in urban air quality owing to their photochemical behavior in the atmosphere.However,traditional methods for assessing the environmental effects of VOCs based on measured concentrations(VOCM)often underestimate photochemical losses.This study utilized NO+PTR-QMS for high-time-resolution online monitoring of VOCs in Guangzhou University City during the of 2024(August-October),overcoming the limitations of traditional PTR-MS in alkane detection.The results showed that during the observation period,the average volume fraction of atmospheric VOCs in Guangzhou was(29.0±0.73)×10-9,with alkanes(33.6%),aromatics(26.6%),and OVOCs(24.7%)being the main components.The 12h daytime variation in VOCs exhibited a bimodal pattern consistent with the morning and evening traffic peaks.The overall photochemical loss rate of VOCs(VOCL)was as high as 22.3%,with the highest loss rate observed for alkenes(50.5%).After considering photochemical losses,traditional assessment methods based on VOCM significantly underestimated the true environmental effects of VOCs:the Ozone Formation Potential(OFPL)was underestimated by 35.5%,mainly driven by the highly reactive alkenes(butadiene 44.2%,butene 17.5%);the Secondary Organic Aerosol Potential(SOAPL)was underestimated by 33.7%,mainly driven by high-SOA-yield aromatics(styrene 73.4%,C9/C8 aromatics).This study highlights that an accurate assessment of the environmental effects of VOCs requires consideration of photochemical loss.Prioritizing the control of highly reactive alkenes can effectively reduce O3 formation,whereas controlling high-yield aromatics is key to reducing SOA pollution,which provides a scientific basis for the development of accurate VOCs emission reduction strategies and synergistic control of O3 and PM2.5 in Guangzhou City.关键词
广州市/挥发性有机物/光化学损失/二次污染物生成潜势/NO+PTR-QMSKey words
Guangzhou City/volatile organic compounds/photochemical loss/secondary pollutant formation potential/NO+PTR-QMS分类
资源环境引用本文复制引用
DU Ruoyu,MA Xiaoyao,CHEN Jiangyao..基于NO+PTR-QMS在线观测评估广州市夏季大气VOCs的光化学损失及二次环境效应[J].生态环境学报,2026,35(1):112-123,12.基金项目
国家自然科学基金项目(42577424 （）
42177354) （）
