Partitioning of reactive oxygen species from indoor surfaces to indoor aerosols

Morrison, Glenn; Eftekhari, Azin; Lakey, Pascale S. J.; Shiraiwa, Manabu; Cummings, Bryan E.; Waring, Michael S.; Williams, Brent J.

doi:10.1039/d2em00307d

Cited by 11 publications

(31 citation statements)

References 88 publications

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“…ROS formed by indoor ozone surface chemistry has been modeled and is predicted to contribute substantially to inhalation of ROS that have partitioned from interior surfaces to particles. 18 The yield measured here (∼0.46) is nearly identical to that used in that model (0.5). Considering the potential volatilization observed in Figure 2, the yield of the lower-volatility ROS is probably somewhat lower than this value, but the increase in the ROS surface concentration in the absence of ozone (Figure 1) suggests that mechanisms other than direct ozonation, such as autoxidation, contribute to ROS formation.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…An indoor emission rate of ROS of 105–186 nmol/h (as H 2 O 2 ) was estimated, but no specific source was identified . Morrison et al hypothesized that ozone surface chemistry generated semivolatile organic peroxides that can partition into particles . It is now well understood that semivolatile organic compounds (SVOCs) present on indoor surfaces partition to aerosols; − aerosols can even increase rates of emission of SVOCs from indoor surfaces. , A model based on ROS formation by ozone on indoor surfaces and partitioning to PM supports the field measurements .…”

Section: Introductionmentioning

confidence: 99%

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Ozone-Initiated Yield of Reactive Oxygen Species in a Model Indoor Surface Film

Morrison

Moravec

Yao

2023

Environ. Sci. Technol. Lett.

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Recent evidence suggests that products of indoor ozone chemistry contribute to cardiovascular pathophysiology. A hypothetical exposure pathway is the formation of reactive oxygen species (ROS) on indoor surfaces, and subsequent partitioning of ROS to respirable particulate matter (PM). For this pathway to be relevant, the ozone-initiated surface yield of ROS should be large enough to contribute substantially to total ROS intake by PM. Here, we exposed a model indoor surface film comprising a mixture of skin and cooking oil lipids to ozone and measured the yield of condensedphase ROS using a colorimetric method sensitive primarily to hydroperoxides and calibrated with hydrogen peroxide. Approximately 46% of the ozone that was consumed in the reaction formed ROS on a molar basis. Approximately half of the ROS formed is persistent for at least several hours on the surface. ROS continued to form in the absence of ozone, suggesting that a mechanism other than ozonation continues to oxidize the lipids, such as autoxidation. The yields observed here are well above that necessary to contribute to the ROS airborne concentrations observed in field studies.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ozone-Initiated Yield of Reactive Oxygen Species in a Model Indoor Surface Film

Morrison

Moravec

Yao

2023

Environ. Sci. Technol. Lett.

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“…The O–O bond is generally weak and may therefore dissociate via the interaction of H 2 O. It is also possible that both oxygen atoms in ≡SiOO• transfer to H 2 O 2 because the free-energy barrier of this route may be significantly reduced by catalysis such as water or acids, as observed in experimental and theoretical studies of organic hydroperoxide chemistry ( 59 – 61 ). In either case, the oxygen atoms in peroxy radicals, rather than water molecules alone, could have contributed to HO 2 • (perhydroxyl radical), H 2 O 2 , and O 2 production ( Fig.…”

Section: Possible Mechanisms For H 2 O 2...mentioning

confidence: 99%

A mineral-based origin of Earth’s initial hydrogen peroxide and molecular oxygen

Zhu

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Terrestrial reactive oxygen species (ROS) may have played a central role in the formation of oxic environments and evolution of early life. The abiotic origin of ROS on the Archean Earth has been heavily studied, and ROS are conventionally thought to have originated from H 2 O/CO 2 dissociation. Here, we report experiments that lead to a mineral-based source of oxygen, rather than water alone. The mechanism involves ROS generation at abraded mineral–water interfaces in various geodynamic processes (e.g., water currents and earthquakes) which are active where free electrons are created via open-shell electrons and point defects, high pressure, water/ice interactions, and combinations of these processes. The experiments reported here show that quartz or silicate minerals may produce reactive oxygen-containing sites (≡SiO•, ≡SiOO•) that initially emerge in cleaving Si–O bonds in silicates and generate ROS during contact with water. Experimental isotope-labeling experiments show that the hydroxylation of the peroxy radical (≡SiOO•) is the predominant pathway for H 2 O 2 generation. This heterogeneous ROS production chemistry allows the transfer of oxygen atoms between water and rocks and alters their isotopic compositions. This process may be pervasive in the natural environment, and mineral-based production of H 2 O 2 and accompanying O 2 could occur on Earth and potentially on other terrestrial planets, providing initial oxidants and free oxygen, and be a component in the evolution of life and planetary habitability.

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“…45,46,48 Indoor measurements of gasphase ROOHs are limited to measurements of total hydroperoxides (H 2 O + ROOH) which 2 studies measured at mixing ratios up to ∼2 ppb in simulated 45 and manipulated 46 indoor settings in the absence of cleaning. ROOHs are expected to be important reactive oxygen species (ROS) for which human exposures could result in negative health outcomes 49,50 and their chemistry could alter the composition of indoor air, particulate matter and surfaces through oxidation and partitioning. 50,51 Reactive uptake of ROOHs is already known to play an important role in the chemistry of outdoor aqueous aerosols and clouds.…”

Section: Introductionmentioning

confidence: 99%

“…ROOHs are expected to be important reactive oxygen species (ROS) for which human exposures could result in negative health outcomes 49,50 and their chemistry could alter the composition of indoor air, particulate matter and surfaces through oxidation and partitioning. 50,51 Reactive uptake of ROOHs is already known to play an important role in the chemistry of outdoor aqueous aerosols and clouds. 37,[52][53][54][55][56] For example, humidity, and presumably aerosol liquid water, was shown to facilitate the reactive uptake to aerosols of ROOHs derived from terpene ozonolysis.…”

Section: Introductionmentioning

confidence: 99%