Abstract
Activities such as household cleaning can greatly alter the composition of air in indoor environments. We continuously monitored hydrogen peroxide (H2O2) from household non-bleach surface cleaning in a chamber designed to simulate a residential room. Mixing ratios of up to 610 ppbv gaseous H2O2 were observed following cleaning, orders of magnitude higher than background levels (sub-ppbv). Gaseous H2O2 levels decreased rapidly and irreversibly, with removal rate constants (kH2O2) 17-73 times larger than air change rate (ACR). Increasing the surface-area-to-volume ratio within the room caused peak H2O2 mixing ratios to decrease and kH2O2 to increase, suggesting that surface uptake dominated H2O2 loss. Volatile organic compound (VOC) levels increased rapidly after cleaning and then decreased with removal rate constants 1.2-7.2 times larger than ACR, indicating loss due to surface partitioning and/or chemical reactions. We predicted photochemical radical production rates and steady-state concentrations in the simulated room using a detailed chemical model for indoor air (the INDCM). Model results suggest that, following cleaning, H2O2 photolysis increased OH concentrations by 10-40% to 9.7 × 105 molec cm-3 and hydroperoxy radical (HO2) concentrations by 50-70% to 2.3 × 107 molec cm-3 depending on the cleaning method and lighting conditions.
Original language | English |
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Pages (from-to) | 15643-15651 |
Number of pages | 9 |
Journal | Environmental Science and Technology |
Volume | 54 |
Issue number | 24 |
DOIs | |
State | Published - Dec 15 2020 |
Externally published | Yes |
Funding
Funding for this work was provided by the Alfred P. Sloan Foundation Chemistry of Indoor environments (CIE) program (G-2018-11062 (T.F.K.) and G-2019-12306 (N.C.)). T.F.K. is a Canada Research Chair in Environmental Analytical Chemistry. This research was undertaken, in part, thanks to funding from the Canada Research Chairs program. The authors acknowledge Howard Hunter at York University for helping with the NMR analysis.
Funders | Funder number |
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Alfred P. Sloan Foundation | G-2019-12306, G-2018-11062 |
Canada Research Chairs |