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- W2785451242 abstract "Kinetics and mechanism of limononic acid (3-isopropenyl-6-oxoheptanoic acid, LA) oxidation by hydroxyl radicals (OH) and ozone (O3) were studied in the aqueous phase at 298 ± 2 K. These reactions were investigated using liquid chromatography coupled to the electrospray ionization and quadrupole tandem mass spectrometry (LC-ESI/MS/MS). The rate coefficients determined for LA + OH reaction were: 1.3 ± 0.3 × 1010 M-1 s-1 at pH = 2 and 5.7 ± 0.6 × 109 M-1 s-1 at pH = 10. The rate coefficient determined for LA ozonolysis was 4.2 ± 0.2 × 104 M-1 s-1 at pH = 2. The calculated Henry's law constant (H) for LA was ca. 6.3 × 106 M × atm-1, thereby indicating that in fogs and clouds with LWC = 0.3-0.5 g × m-3 LA will reside entirely in the aqueous phase. Calculated atmospheric lifetimes due to reaction with OH and O3 strongly indicate that aqueous-phase oxidation can be important for LA under realistic atmospheric conditions. Under acidic conditions, the aqueous-phase oxidation of LA by OH will dominate over reaction with O3, whereas the opposite is more likely when pH ≥ 4.5. The aqueous-phase oxidation of LA produced keto-limononic acid and a number of low-volatility products, such as hydroperoxy-LA and α-hydroxyhydroperoxides." @default.
- W2785451242 created "2018-02-23" @default.
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- W2785451242 date "2018-02-14" @default.
- W2785451242 modified "2023-09-23" @default.
- W2785451242 title "Limononic Acid Oxidation by Hydroxyl Radicals and Ozone in the Aqueous Phase" @default.
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- W2785451242 doi "https://doi.org/10.1021/acs.est.7b04867" @default.
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