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- W2963533464 abstract "Acidity changes the physical properties of atmospheric aerosol particles and the mechanisms of reactions that occur therein and on the surface. Here, we used surface-sensitive pneumatic ionization mass spectrometry to investigate the effects of pH on the heterogeneous reactions of aqueous α-terpineol (C10H17OH), a representative monoterpene alcohol, with gaseous ozone. Rapid (≤10 μs) ozonolysis of α-terpineol produced Criegee intermediates (CIs, zwitterionic/diradical carbonyl oxides) on the surface of water microjets. We studied the effects of microjet bulk pH (1–11) on the formation of functionalized carboxylate and α-hydroxy-hydroperoxide chloride adduct (HH–Cl–) products generated by isomerization and hydration of α-terpineol CIs, respectively. Compared with the signal at pH ≈ 6, the mass spectral signal of HH–Cl– was less intense under both basic and more acidic conditions, whereas the intensity of the functionalized carboxylate signal increased with increasing pH up to 4 and then remained constant. The decrease of HH–Cl– signals at bulk pH values of >6 is attributable to the accumulation of OH– at the air–water interface that suppresses the relative abundance of hydrophilic HH and Cl–. The present study suggests that α-terpineol in ambient aqueous organic aerosols will be converted into much lower volatile and potentially toxic organic hydroperoxides during the heterogeneous ozonolysis." @default.
- W2963533464 created "2019-07-30" @default.
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- W2963533464 date "2019-07-22" @default.
- W2963533464 modified "2023-10-17" @default.
- W2963533464 title "Effects of pH on Interfacial Ozonolysis of α-Terpineol" @default.
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- W2963533464 doi "https://doi.org/10.1021/acs.jpca.9b05434" @default.
- W2963533464 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31329444" @default.
- W2963533464 hasPublicationYear "2019" @default.
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