Citation:

Liu, X., M A. Mason*, K A. Krebs*, AND L E. Sparks*. FULL-SCALE CHAMBER INVESTIGATION AND SIMULATION OF AIR FRESHENER EMISSIONS IN THE PRESENCE OF OZONE. J. Schnoor (ed.), ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 38(10):2802-2812, (2004).

Impact/Purpose:

Journal Article

Description:

The paper discusses results of tests, conducted in the EPA large chamber facility, determining emissions and chemical degradation of volatile organic compounds (VOCs) from one electrical plug-in type pine-scented air freshener in the presence of ozone supplied by a device marketed as an ozone-generating air cleaner. O₃ and NOx concentrations as well as chamber conditions such as temperature, relative humidity, pressure, and air exchange rate were controlled and/or monitored. VOC emissions and some of the reaction products were identified and quantified. Models were developed to predict the time/concentration profiles of the major VOCs (limonene, α-pinene, β-pinene, 3-carene, camphene, benzyl propionate, benzyl alcohol, bornyl acetate, isobornyl acetate, and benzaldehyde) from the air freshener. Source emissions models were established. Gas phase reactions of VOCs from the air freshener with ozone were simulated by the photochemical kinetics simulation system; VOC reaction mechanisms and rate constants were adopted from the literature and incorporated into the model. Time series of VOCs from air fresheners and ozone in the large chamber were well reproduced, as were some of the primary products such as nopinone. A systematic discrepancy between theory and experiment was also found for some species. The discrepancy is probably caused by poorly understanding secondary and subsequent reactions. Models used in the simulation from this study could serve as a reasonably good starting point for development of a general indoor air quality (IAQ) model. The method has the potential to provide data to predict the impact of O₃/VOC interactions on IAQ.

URLs/Downloads:

Record Details: