Indoor heterogeneous photochemistry of furfural drives emissions of nitrous acid.

Autor: Depoorter A; Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France., Kalalian C; Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France., Emmelin C; Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France., Lorentz C; Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France., George C; Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
Jazyk: angličtina
Zdroj: Indoor air [Indoor Air] 2021 May; Vol. 31 (3), pp. 682-692. Date of Electronic Publication: 2020 Oct 27.
DOI: 10.1111/ina.12758
Abstrakt: People spend approximately 80% of their time indoor, making the understanding of the indoor chemistry an important task for safety. The high surface-area-to-volume ratio characteristic of indoor environments leads the semi-volatile organic compounds (sVOCs) to deposit on the surfaces. Using a long path absorption photometer (LOPAP), this work investigates the formation of nitrous acid (HONO) through the photochemistry of adsorbed nitrate anions and its enhancement by the presence of furfural. Using a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS), this work also investigates the surface emissions of VOCs from irradiated films of furfural and a mix of furfural and nitrate anions. Among the emitted VOCs, 2(5H)-furanone/2-Butenedial was observed at high concentrations, leading to maleic anhydride formation after UV irradiation. Moreover, the addition of potassium nitrate to the film formed NO x and HONO concentrations up to 10 ppb, which scales to ca. 4 ppb for realistic indoor conditions. This work helps to understand the high levels of HONO and NO x measured indoors.
(© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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