• 关键词：挥发性有机物  臭氧生成潜势  变化特征  来源解析

• 基金项目：大气重污染成因与治理攻关项目（No.DQGG0107-28）

• 王红果
• 河南省济源生态环境监测中心, 济源 459000

• 孙永旺
• 河南省济源生态环境监测中心, 济源 459000

• 王芳
• 河南省济源生态环境监测中心, 济源 459000

• 卫伟
• 河南省济源生态环境监测中心, 济源 459000

• 赵宗生
• 河南省济源生态环境监测中心, 济源 459000

• 张建平
• 河南省济源生态环境监测中心, 济源 459000

• 林锡华
• 生态环境部华南环境科学研究所, 广州 510655

• 马社霞
• 生态环境部华南环境科学研究所, 广州 510655

• 摘要：采用挥发性有机物（VOCs）在线监测仪（EXPEC 2000-MS）于2020年1月1日-2月11日对济源市环境空气中VOCs进行监测，分析了疫情防控前和期间TVOCs及其组分的变化特征、臭氧生成潜势（OFP）及来源解析.结果表明，疫情防控期间济源市TVOCs浓度均值为121.7×10^-9，比疫情防控前增加了61.2%.烷烃、炔烃和烯烃的平均浓度和占比相对于疫情防控前明显减少，而卤代烃的平均浓度上升了79.5%，占比增加2.6%，OVOCs的平均浓度升高了5.5倍，占比显著增加了31.4%，主要来自乙醇、丙酮、三氯甲烷、溴甲烷和氯乙烷等化合物的排放.疫情防控前济源市的OFP主要以烯烃的贡献为主，关键活性物种为乙烯、1-丁烯、乙炔等，而疫情防控期间OVOCs对OFP的贡献不容忽视，关键活性物种主要是乙醇、乙烯、丙烯醛、甲苯等.用PMF模型法判断济源市VOCs的来源贡献，疫情防控期间对TVOCs贡献占比较高的来源依次是：燃烧源（33%）>消毒剂（31%）>工艺过程源（17%）>植物源（8%）>溶剂使用源（7%）、汽油车尾气（7%）>柴油车尾气（6%）.受疫情的影响，机动车尾气、工艺过程和溶剂使用源对济源市TVOCs的贡献大幅降低，分别降低了17%、17%和10%，来自于消毒剂使用的乙醇、含氯的消毒剂（三氯甲烷、氯乙烷等）对济源市TVOCs的贡献明显增加了29%.

• Abstract：Ambient volatile organic compounds (VOCs) in Jiyuan city were determined by an online monitor (EXPEC 2000-MS) from January 1 to February 11, 2020. In this study, the diurnal characteristics and ozone generation potential (OFP) of ambient VOCs were analyzed, source apportionment of VOCs were determined by characteristic ratios and Positive Matrix Factorization (PMF) model before and during epidemic prevention. The results showed that TVOCs in Jiyuan during epidemic prevention period was 121.7×10^-9, which was 61.2% higher than that before epidemic prevention. Compare to the results before epidemic prevention, concentrations of alkanes, alkynes and alkenes decreased significantly, while halogenated hydrocarbons and OVOCs increased significantly. Major VOCs species during epidemic prevention were ethanol, acetone, acetylene and bromomethane. The contribution of VOCs species to OFP before epidemic prevention in Jiyuan was olefins, the key active components were ethylene, 1-butene, acetylene, etc. However, the key active components during epidemic prevention were ethanol, ethylene, acrolein, toluene, etc, which suggested that the contribution of OVOCs to OFP could not be ignored during epidemic prevention. Based on PMF model, major sources contributed to TVOCs during epidemic prevention in Jiyuan were combustion (33%)>disinfectant (31%)>industrial process (17%)>biogenic source (8%)>solvent use (7%), gasoline vehicle exhaust(7%)> diesel vehicle exhaust (6%). The contribution of vehicle exhaust, industrial process and solvent use to TVOCs in Jiyuan was significantly reduced 17%, 17% and 10%, respectively. The contribution of disinfectant, including ethanol and chlorine-containing disinfectant (trichloromethane, chloroethane, etc.) to TVOCs was increased 29% during epidemic prevention.

• Key words：volatile organic compounds  ozone formation potential  characteristics  source apportionment

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