Important contributions of alkenes and aromatics to VOCs emissions, chemistry and secondary pollutants formation at an industrial site of central eastern China

被引：35

作者：

Gao, Yaqin ^{[1
,8
]}

Li, Mei ^{[2
,3
]}

Wan, Xiao ^{[4
,5
]}

Zhao, Xiuwen ^{[6
]}

Wu, Yang ^{[7
]}

Liu, Xiaoxia ^{[7
]}

Li, Xiang ^{[1
]}

机构：

[1] Fudan Univ, Dept Environm Sci & Engn, Shanghai 200032, Peoples R China

[2] Jinan Univ, Inst Mass Spectrometer & Atmospher Environm, Guangzhou 510632, Peoples R China

[3] Guangdong Prov Engn Res Ctr Line Source Apportion, Guangzhou 510632, Peoples R China

[4] Bay Environm Technol Corp, Beijing 100101, Peoples R China

[5] State Environm Protect Technol Ctr Volatile Organ, Beijing 100101, Peoples R China

[6] Total Pollutant Control Off Linzi Dist, Zibo 255400, Peoples R China

[7] Environm Monitoring Stn Linzi Dist, Zibo 255400, Peoples R China

[8] Shanghai Acad Environm Sci, H State Environm Protect Key Lab Format & Prevent, Shanghai 200032, Peoples R China

来源：

ATMOSPHERIC ENVIRONMENT | 2021年 / 244卷

关键词：

VOC chemistry; O-3; exposure; Night removal; Emission ratio; Naphthalene; VOLATILE ORGANIC-COMPOUNDS; POSITIVE MATRIX FACTORIZATION; PHOTOCHEMICAL OZONE FORMATION; PEARL RIVER-DELTA; PTR-TOF-MS; SOURCE APPORTIONMENT; GEOGRAPHICAL ORIGINS; SOA FORMATION; AEROSOLS; REACTIVITY;

D O I：

10.1016/j.atmosenv.2020.117927

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site of Zibo city in September 2018 using an online gas chromatography-time of flight mass spectrometry instrument (GC-TOFMS). Diurnal profile analysis showed that while the removal of most reactive hydrocarbons such as alkanes, small alkenes, and aromatics was governed by OH chemistry, nighttime removal for several highly reactive alkenes by ozone was also significant. The influence of nighttime removal on emission ratio determinations were further explored by parameterization method based on OH radical chemistry/ozone chemistry and comparison of emission ratios with nearby regions. The results revealed that nighttime removal for several alkenes likely leaded to underestimation of emission ratios in previous studies. The emission ratios of aromatics in Zibo were also unexpectedly higher than those at the receptor site in central eastern China. Detailed source analyses of VOCs using a positive matrix factorization (PMF) method suggested important contributions from both petrochemical emission and vehicle exhaust & LPG usage for measured alkenes and dominant contribution from coal combustion for aromatics. Ozone formation potential (OFP) and secondary organic aerosol potential (SOAP) calculation suggested that alkenes were the dominant contributor to OFP (59.4%); while aromatics could produce large amounts of SOA (1.10 +/- 0.88 mu gm(3)) and naphthalene alone dominated (similar to 43.0%) the total SOA estimated from measured VOCs. The results enable improved mitigation strategies and chemical links between direct emissions and SOA/ozone impacts on climate and health in these regions.

引用

页数：11

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