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- W2990016685 abstract "Oil sands (OS) are an important type of heavy oil deposit, for which operations in Alberta, Canada, were recently found to be a large source of secondary organic aerosol (SOA). However, SOA formation from the OS mining, processing, and subsequent tailings, especially in the presence of NOx, remains unclear. Here, photooxidation experiments for OS-related precursors under high-NOx conditions were performed using an oxidation flow reactor, in which ∼95% of peroxy radicals (RO2) react with NO. The SOA yields under high-NOx conditions were found to be lower than yields under low-NOx conditions for all precursors, which is likely due to the higher volatilities of the products from the RO2 + NO pathway compared with RO2 + HO2. The SOA yields under high-NOx conditions show a strong dependence on pre-existing surface area (not observed in previous low-NOx experiments), again attributed to the higher product volatilities. Comparing the mass spectra of SOA formed from different precursors, we conclude that the fraction of m/z > 80 (F80) can be used as a parameter to separate different types of SOA in the region. In addition, particle-phase organic nitrate was found to be an important component (9–23%) of OS SOA formed under high-NOx conditions. These results have implications for better understanding the atmospheric processing of OS emissions." @default.
- W2990016685 created "2019-12-05" @default.
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- W2990016685 date "2019-11-21" @default.
- W2990016685 modified "2023-10-03" @default.
- W2990016685 title "Understanding the Impact of High-NO<sub><i>x</i></sub> Conditions on the Formation of Secondary Organic Aerosol in the Photooxidation of Oil Sand-Related Precursors" @default.
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- W2990016685 doi "https://doi.org/10.1021/acs.est.9b05404" @default.
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