Abstract
Gaseous nitrogen dioxide (NO2) represents an oxidant that is present in relatively high concentrations in various indoor settings. Remarkably increased NO2 levels up to 1.5 ppm are associated with homes using gas stoves. The heterogeneous reactions of NO2 with adsorbed water on surfaces lead to the generation of nitrous acid (HONO). Here, we present a HONO source induced by heterogeneous reactions of NO2 with selected indoor paint surfaces in the presence of light (300 nm < λ < 400 nm). We demonstrate that the formation of HONO is much more pronounced at elevated relative humidity. In the presence of light (5.5 W m−2), an increase of HONO production rate of up to 8.6 · 109 molecules cm−2 s−1 was observed at [NO2] = 60 ppb and 50 % relative humidity (RH). At higher light intensity of 10.6 (W m−2), the HONO production rate increased to 2.1 · 1010 molecules cm−2 s−1. A high NO2 to HONO conversion yield of up to 84 % was observed. This result strongly suggests that a light-driven process of indoor HONO production is operational. This work highlights the potential of paint surfaces to generate HONO within indoor environments by light-induced NO2 heterogeneous reactions.
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Acknowledgments
The authors gratefully acknowledge the project “Les surfaces internes à l'habitat, une source probable d'acide nitreux” and the French program PRIMEQUAL.
This work is also a contribution to the LABEX SERENADE (no. ANR-11-LABX-0064) funded by the “Investissements d’Avenir,” French Government program of the French National Research Agency (ANR) through the A*Midex project (no. ANR-11-IDEX-0001-02). Financial support by the German Science foundation (DFG project HE5214/4-1) is gratefully acknowledged.
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Bartolomei, V., Sörgel, M., Gligorovski, S. et al. Formation of indoor nitrous acid (HONO) by light-induced NO2 heterogeneous reactions with white wall paint. Environ Sci Pollut Res 21, 9259–9269 (2014). https://doi.org/10.1007/s11356-014-2836-5
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DOI: https://doi.org/10.1007/s11356-014-2836-5