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Scientific Articles - PTR-MS Bibliography

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Publications

Found 2 results
Title [ Year(Desc)]
Filters: Author is Weschler, Charles J  [Clear All Filters]
2006
[Tamas2006] Tamas, G., C. J. Weschler, Z. Bako-Biro, D. P. Wyon, and P. Strøm-Tejsen, "Factors affecting ozone removal rates in a simulated aircraft cabin environment", Atmospheric environment, vol. 40, no. 32: Elsevier, pp. 6122–6133, 2006.
Link: http://www.sciencedirect.com/science/article/pii/S1352231006005152
Abstract
Ozone concentrations were measured concurrently inside a simulated aircraft cabin and in the airstream providing ventilation air to the cabin. Ozone decay rates were also measured after cessation of ozone injection into the supply airstream. By systematically varying the presence or absence of people, soiled T-shirts, aircraft seats and a used HEPA filter, we have been able in the course of 24 experiments to isolate the contributions of these and other factors to the removal of ozone from the cabin air. In the case of this simulated aircraft, people were responsible for almost 60% of the ozone removal occurring within the cabin and recirculation system; respiration can only have been responsible for about 4% of this removal. The aircraft seats removed about 25% of the ozone; the loaded HEPA filter, 7%; and the other surfaces, 10%. A T-shirt that had been slept in overnight removed roughly 70% as much ozone as a person, indicating the importance of skin oils in ozone removal. The presence of the used HEPA filter in the recirculated airstream reduced the perceived air quality. Over a 5-h period, the overall ozone removal rate by cabin surfaces decreased at ∼3% h−1. With people present, the measured ratio of ozone's concentration in the cabin versus that outside the cabin was 0.15–0.21, smaller than levels reported in the literature. The results reinforce the conclusion that the optimal way to reduce people's exposure to both ozone and ozone oxidation products is to efficiently remove ozone from the air supply system of an aircraft.
2007
[Weschler2007] Weschler, C. J., A. Wisthaler, S. Cowlin, G. Tamas, P. Strøm-Tejsen, A. T. Hodgson, H. Destaillats, J. Herrington, J. Zhang, and W. W. Nazaroff, "Ozone-initiated chemistry in an occupied simulated aircraft cabin", Environmental Science & Technology, vol. 41, no. 17: ACS Publications, pp. 6177–6184, 2007.
Link: http://pubs.acs.org/doi/abs/10.1021/es0708520
Abstract
We have used multiple analytical methods to characterize the gas-phase products formed when ozone was added to cabin air during simulated 4-hour flights that were conducted in a reconstructed section of a B-767 aircraft containing human occupants. Two separate groups of 16 females were each exposed to four conditions:  low air exchange (4.4 h-1), <2 ppb ozone; low air exchange, 61−64 ppb ozone; high air exchange (8.8 h-1), <2 ppb ozone; and high air exchange, 73−77 ppb ozone. The addition of ozone to the cabin air increased the levels of identified byproducts from 70 to 130 ppb at the lower air exchange rate and from 30 to 70 ppb at the higher air exchange rate. Most of the increase was attributable to acetone, nonanal, decanal, 4-oxopentanal (4-OPA), 6-methyl-5-hepten-2-one (6-MHO), formic acid, and acetic acid, with 0.25−0.30 mol of quantified product volatilized per mol of ozone consumed. Several of these compounds reached levels above their reported odor thresholds. Most byproducts were derived from surface reactions with occupants and their clothing, consistent with the inference that occupants were responsible for the removal of >55% of the ozone in the cabin. The observations made in this study have implications for other indoor settings. Whenever human beings and ozone are simultaneously present, one anticipates production of acetone, nonanal, decanal, 6-MHO, geranyl acetone, and 4-OPA.

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