| Title: | "Volatile organic compounds in a typical petrochemical industrialized valley city of northwest China based on high-resolution PTR-MS measurements: Characterization, sources and chemical effects" |
| Author(s): | Zhou X; Li Z; Zhang T; Wang F; Wang F; Tao Y; Zhang X; Wang F; Huang J; |
| Address: | "Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Tianshan Glaciological Station, Chinese Academy of Sciences, Lanzhou 730000, China. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Tianshan Glaciological Station, Chinese Academy of Sciences, Lanzhou 730000, China; College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730000, China. Electronic address: lizq@lzb.ac.cn. Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; University Corporation for Polar Research, Beijing 100875, China. Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Tianshan Glaciological Station, Chinese Academy of Sciences, Lanzhou 730000, China. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730000, China" |
| DOI: | 10.1016/j.scitotenv.2019.03.283 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "To scientifically understand the emissions and chemistry of volatile organic compounds (VOCs) in a typical petrochemical industrialized and dust-rich region of Northwest China, VOCs were measured at a receptor site in the Lanzhou Valley using a high-resolution online proton transfer reaction-mass spectrometer (PTR-MS). The ranking of VOC mixing ratios was methanol (32.72?ª++/-?ª+8.94?ª+ppb)?ª+>?ª+acetaldehyde (5.05?ª++/-?ª+2.4?ª+ppb)?ª+>?ª+acetic acid (3.42?ª++/-?ª+1.71?ª+ppb). Lanzhou has higher oxygenated VOCs (OVOCs) mixing ratios (methanol and acetaldehyde) and lower aromatics levels (benzene, toluene and C8-aromatics) compared with other cities. The positive matrix factorization (PMF) model showed eight sources of VOCs as follows: (1) mixed industrial process-1 (13.5%), (2) secondary formation (13.2%), (3) mixed industrial process-2 (11.8%), (4) residential biofuel use and waste disposal (13.80%), (5) solvent usage (10.1%), (6) vehicular exhaust (11.8%), (7) biogenic (13.8%) and (8) biomass burning (12.0%). Both the PSCF and the CWT results of mixed industrial process-1 were mainly from the northeast of Lanzhou and the biomass burning was from the southeast; the other four sources (without secondary formation and biogenic) were mainly from the west and northwest of Lanzhou, which were associated with the dust area of the Gobi Desert. A trajectory sector analysis revealed that the local emissions contributed 64.9-71.1% to the VOCs. OVOCs accounted for 43% of the ozone production potential (OFP), and residential biofuel use and waste disposal (25.1%), mixed industrial process-2 (15.3%) and solvent usage (13.4%) appeared to be the dominant sources contributors to O(3) production. The rank of main secondary organic aerosols (SOA) precursors under low-NOx conditions is xylene?ª+>?ª+toluene?ª+>?ª+benzene?ª+>?ª+naphthalene?ª+>?ª+styrene?ª+>?ª+C10-aromatics?ª+>?ª+isoprene, while under high-NOx conditions, it is toluene?ª+>?ª+naphthalene?ª+>?ª+xylene?ª+>?ª+C10-aromatics?ª+>?ª+styrene?ª+>?ª+benzene?ª+>?ª+isoprene. Solvent usage and vehicular exhaust appeared to be the dominant contributors to SOA formation" |
| Keywords: | Lanzhou Ofp Ptr-ms Soaf Source apportionment VOCs; |
| Notes: | "PubMed-not-MEDLINEZhou, Xi Li, Zhongqin Zhang, Tinjun Wang, Fanglin Wang, Feiteng Tao, Yan Zhang, Xin Wang, Fanglong Huang, Ju eng Netherlands 2019/04/05 Sci Total Environ. 2019 Jun 25; 671:883-896. doi: 10.1016/j.scitotenv.2019.03.283. Epub 2019 Mar 22" |
