| Title: | Significant OH production under surface cleaning and air cleaning conditions: Impact on indoor air quality |
| Author(s): | Carslaw N; Fletcher L; Heard D; Ingham T; Walker H; |
| Address: | "Environment Department, University of York, York, UK. Institute of Public health and Environmental Engineering (iPHEE), School of Civil Engineering, University of Leeds, Leeds, UK. School of Chemistry, University of Leeds, Leeds, UK. National Centre for Atmospheric Science, University of Leeds, Leeds, UK. Now at the Institute of Climate and Academic Science, School of Earth and Environment, University of Leeds, Leeds, UK" |
| ISSN/ISBN: | 1600-0668 (Electronic) 0905-6947 (Linking) |
| Abstract: | "We report measurements of hydroxyl (OH) and hydroperoxy (HO(2) ) radicals made by laser-induced fluorescence spectroscopy in a computer classroom (i) in the absence of indoor activities (ii) during desk cleaning with a limonene-containing cleaner (iii) during operation of a commercially available 'air cleaning' device. In the unmanipulated environment, the one-minute averaged OH concentration remained close to or below the limit of detection (6.5x10(5) molecule cm(-3) ), whilst that of HO(2) was 1.3x10(7) molecule cm(-3) . These concentrations increased to ~4x10(6) and 4x10(8) molecule cm(-3) , respectively during desk cleaning. During operation of the air cleaning device, OH and HO(2) concentrations reached ~2x10(7) and ~6x10(8) molecule cm(-3) respectively. The potential of these OH concentrations to initiate chemical processing is explored using a detailed chemical model for indoor air (the INDCM). The model can reproduce the measured OH and HO(2) concentrations to within 50% and often within a few % and demonstrates that the resulting secondary chemistry varies with the cleaning activity. Whilst terpene reaction products dominate the product composition following surface cleaning, those from aromatics and other VOCs are much more important during the use of the air cleaning device" |
| Keywords: | "Air/analysis *Air Pollution, Indoor *Disinfection Hydroxides/*analysis Models, Chemical Oxygen/analysis Peroxides/*analysis Volatile Organic Compounds/analysis air cleaning technology hydroperoxy radical hydroxyl radical indoor air chemical model indoor a;" |
| Notes: | "MedlineCarslaw, N Fletcher, L Heard, D Ingham, T Walker, H eng England 2017/05/12 Indoor Air. 2017 Nov; 27(6):1091-1100. doi: 10.1111/ina.12394. Epub 2017 Jun 1" |
