Estimating indoor semi-volatile organic compounds (SVOCs) associated with settled dust by an integrated kinetic model accounting for aerosol dynamics

Shi, Shanshan; Zhao, Bin

doi:10.1016/j.atmosenv.2015.01.076

Cited by 36 publications

(13 citation statements)

References 37 publications

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“…Semi-volatile, unsaturated organic species are common on various surfaces including soil with plant litter (Weiss, 2000;Isidorov et al, 2003;Ormeño et al, 2009), aerosols (Rogge et al, 1993;D'Anna et al, 2009;Baduel et al, 2011), man-made structures (Wisthaler et al, 2005;Weschler et al, 2007;Shi and Zhao, 2015), and even human skin (Wisthaler and Weschler, 2010). These are potential ozone sinks and sources of oxygenated VOC in ozone-rich environments, as has been shown previously (see e.g.…”

Section: Discussionmentioning

confidence: 75%

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

et al. 2016

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Abstract. Elevated tropospheric ozone concentrations are considered a toxic threat to plants, responsible for global crop losses with associated economic costs of several billion dollars per year. Plant injuries have been linked to the uptake of ozone through stomatal pores and oxidative damage of the internal leaf tissue. But a striking question remains: can surface reactions limit the stomatal uptake of ozone and therefore reduce its detrimental effects to plants?In this laboratory study we could show that semi-volatile organic compounds exuded by the glandular trichomes of different Nicotiana tabacum varieties are an efficient ozone sink at the plant surface. In our experiments, different diterpenoid compounds were responsible for a strongly varietydependent ozone uptake of plants under dark conditions, when stomatal pores are almost closed. Surface reactions of ozone were accompanied by a prompt release of oxygenated volatile organic compounds, which could be linked to the corresponding precursor compounds: ozonolysis of cis-abienol (C 20 H 34 O) -a diterpenoid with two exocyclic double bonds -caused emissions of formaldehyde (HCHO) and methyl vinyl ketone (C 4 H 6 O). The ring-structured cembratrien-diols (C 20 H 34 O 2 ) with three endocyclic double bonds need at least two ozonolysis steps to form volatile carbonyls such as 4-oxopentanal (C 5 H 8 O 2 ), which we could observe in the gas phase, too.Fluid dynamic calculations were used to model ozone distribution in the diffusion-limited leaf boundary layer under daylight conditions. In the case of an ozone-reactive leaf surface, ozone gradients in the vicinity of stomatal pores are changed in such a way that the ozone flux through the open stomata is strongly reduced.Our results show that unsaturated semi-volatile compounds at the plant surface should be considered as a source of oxygenated volatile organic compounds, impacting gas phase chemistry, as well as efficient ozone sink improving the ozone tolerance of plants.

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Section: Discussionmentioning

confidence: 75%

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

et al. 2016

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“…Information on SVOC emissions from other indoor sources is not available in the literature. The mass transfer coefficients [26,27], partition coefficients [6,28] and reaction rate constants [16] can be calculated using methods developed in previous studies. Table S1 in the SI.…”

Section: Development Of the Modelmentioning

confidence: 99%

A long-term dynamic model for predicting the concentration of semivolatile organic compounds in indoor environments: Application to phthalates

Wei

Ramalho

Mandin

2019

Building and Environment

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Semivolatile organic compounds (SVOCs) in indoor environments can partition into the gas phase, airborne particles, and settled dust and onto available surfaces. A long-term dynamic model was developed to predict the hourly concentrations of SVOCs over a year in the gas phase, airborne particles, and settled dust and on each sink surface. The model takes into account mass transfer mechanisms, the reactivity of SVOCs with oxidants indoors, and the influence of four indoor environmental factors (the air temperature, relative humidity, concentration of indoor airborne particles, and air exchange rate) on the mass transfer parameters. The model was validated for DEHP (di-2-ethylhexyl phthalate) and BBzP (butyl benzyl phthalate) by comparing the predicted concentrations in all the phases with the measured concentrations obtained in an environmental chamber and a test house. The model was then used to predict the hourly averaged concentration of BBzP in all the phases under real environmental conditions over a year. More than 52% of the variance in the BBzP concentration was found to be associated with the covariance of the environmental factors. The air exchange rate contributed to 16% of the variance in the concentration. In addition, the indoor air temperature and relative humidity contributed 9% of the variance in the gas-phase concentration of BBzP and 7% of the variance in the settled dust concentration of BBzP. The variance in the concentration of the total suspended particles contributed 10% of the variance in the BBzP concentration on the walls and windows.

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“…For the kinetic partition model used to simulate concentrations of SVOCs in multiple phases, there are still some disparities between simulated concen trations and concentrations measured in laboratories owing to uncertainty in the input parameters. 18,19 For instance, simulated gas-phase concentrations of BaP deviate from measured concentrations by -6•2% to 6•4%, 26 while simulated airborne concentrations of DEHP deviate from measured concentrations by -34•3% to 78•3%. 18 Second, we used Weschler and Nazaroff's theory of the transdermal flux of SVOCs in the steady state to estimate dermal uptake, which has been widely used for this purpose in previous studies.…”

Section: Discussionmentioning

confidence: 97%

“…We used a previously validated 18,19 kinetic partition mass balance model to simulate indoor concentrations of SVOCs over 1 year in multiple phases, including gas, particle, surface, and dust phases. The model accounts for the effect of building ventilation, particle aerodynamic features, and kinetic partitioning between gas-phase SVOCs and indoor sorption mediums.…”

Section: Svocs Concentration Simulationmentioning

confidence: 99%

Effect of residential air cleaning interventions on risk of cancer associated with indoor semi-volatile organic compounds: a comprehensive simulation study

Shi

Zhao

Zhang

2018

The Lancet Planetary Health

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Background Human exposure to multiphase semi-volatile organic compounds (SVOCs) via multiple routes has been associated with health risks. Residential air cleaning interventions remove SVOCs adsorbed on airborne particles, which subsequently affects indoor concentrations of SVOCs in other phases. We aimed to investigate the effect of residential air cleaning interventions on the overall cancer risk associated with multiphase SVOCs. Methods We simulated concentrations of eight multiphase SVOCs (including seven polycyclic aromatic hydrocarbons [PAHs] and di(2-ethylhexyl) phthalate [DEHP]) using a kinetic partition mass balance model for three exposure scenarios: naturally ventilated residences without intervention (scenario 1), naturally ventilated residences with portable air purifiers (scenario 2), and mechanically ventilated residences with air filtration units (scenario 3). We converted indoor concentrations of the individual PAHs into indoor concentrations of equivalent benzo[a]pyrene (BaP eq) using the BaP cancer potency equivalent factor for each PAH. We estimated indoor exposure to SVOCs via inhalation, dermal absorption, and ingestion. For each scenario, we calculated the incremental lifetime cancer risk (ILCR) associated with indoor exposure to each SVOC via the three routes and the total ILCR (all three routes combined). Findings Mean total ILCRs associated with exposure to BaP eq were 4•42 × 10-⁶ (SD 2•84) for scenario 1, 2•36 × 10-⁶ (1•53) for scenario 2, and 4•88 × 10-⁶ (4•86) for scenario 3. Mean total ILCRs associated with exposure to DEHP were 3•61 × 10-⁶ (3•60) for scenario 1, 7•51 × 10-⁷ (5•34) for scenario 2, and 1•48 × 10-⁵ (2•02) for scenario 3. Ingestion of settled dust was the most important contributor to the total ILCR for both BaP eq and DEHP in all the studied scenarios. Interpretation The large-scale use of mechanical ventilation systems in urban residences in China needs to be evaluated owing to their potential exacerbation of the cancer risks associated with common indoor SVOCs.

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Estimating indoor semi-volatile organic compounds (SVOCs) associated with settled dust by an integrated kinetic model accounting for aerosol dynamics

Cited by 36 publications

References 37 publications

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

A long-term dynamic model for predicting the concentration of semivolatile organic compounds in indoor environments: Application to phthalates

Effect of residential air cleaning interventions on risk of cancer associated with indoor semi-volatile organic compounds: a comprehensive simulation study

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