Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 21, Issue 5, Pages 3473-3490Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-21-3473-2021
Keywords
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Funding
- Natural Environment Research Council [NE/L002469/1]
- European Research Council [638703]
- Vetenskapsradet [2014-5332]
- Svenska Forskningsradet Formas [214-2013-1430]
- VINNOVA [2013-03058]
- Academy of Finland [317380, 320094]
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The study examines benzene oxidation products using different mass spectrometry methods, finding that the nitrate scheme detects more high mass products, while the iodide scheme is more sensitive to IVOCs and SVOCs.
Aromatic hydrocarbons are a class of volatile organic compounds associated with anthropogenic activity and make up a significant fraction of urban volatile organic compound (VOC) emissions that contribute to the formation of secondary organic aerosol (SOA). Benzene is one of the most abundant species emitted from vehicles, biomass burning and industry. An iodide time-of-flight chemical ionisation mass spectrometer (ToF-CIMS) and nitrate ToF-CIMS were deployed at the Julich Plant Atmosphere Chamber as part of a series of experiments examining benzene oxidation by OH under high- and low-NOx conditions, where a range of organic oxidation products were detected. The nitrate scheme detects many oxidation products with high masses, ranging from intermediate volatile organic compounds (IVOCs) to extremely low volatile organic compounds (ELVOCs), including C-12 dimers. In comparison, very few species with C->= 6 and O-> 8 were detected with the iodide scheme, which detected many more IVOCs and semi-volatile organic compounds (SVOCs) but very few ELVOCs and low volatile organic compounds (LVOCs). A total of 132 and 195 CHO
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