Aqueous-Phase Decomposition of Isoprene Hydroxy Hydroperoxide
and Hydroxyl Radical Formation by Fenton-like Reactions with Iron
Ions
Posted on 2020-06-16 - 19:35
Isoprene
hydroxy hydroperoxides
(ISOPOOH) formed by the photooxidation of isoprene under low-NO conditions
play an important role in the formation and evolution of secondary
organic aerosols, yet multiphase processes of ISOPOOH are poorly understood.
By applying electron paramagnetic resonance spectroscopy, we observe
that ISOPOOH undergoes aqueous-phase decomposition upon interacting
with Fe(II) ions to form OH and organic radicals at room temperature.
To reproduce the measured dependence of OH formation on the Fe concentrations
by kinetic modeling, we postulate that Fe(II) ions react with ISOPOOH
via Fenton-like reactions to form OH radicals with a rate constant
of 7.3 × 10–18 cm3 s–1. At low concentrations, oxalate forms monocomplexes with Fe(II)
ions, which can promote OH formation by ISOPOOH. However, at high
concentrations, oxalate scavenges OH radicals, thereby lowering aqueous
OH concentrations. These findings provide new insight for the atmospheric
fate of ISOPOOH and reactive oxygen species generation in the aqueous
phase.
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Fang, Ting; Lakey, Pascale S. J.; Rivera-Rios, Jean C.; Keutsch, Frank N.; Shiraiwa, Manabu (2020). Aqueous-Phase Decomposition of Isoprene Hydroxy Hydroperoxide
and Hydroxyl Radical Formation by Fenton-like Reactions with Iron
Ions. ACS Publications. Collection. https://doi.org/10.1021/acs.jpca.0c02094
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AUTHORS (5)
TF
Ting Fang
PL
Pascale S. J. Lakey
JR
Jean C. Rivera-Rios
FK
Frank N. Keutsch
MS
Manabu Shiraiwa