Formation and growth of indoor air aerosol particles as a result of d-limonene oxidation |
| |
Authors: | E. Vartiainen, M. Kulmala, T.M. Ruuskanen, R. Taipale, J. Rinne,H. Vehkam ki |
| |
Affiliation: | aDepartment of Physical Sciences, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland;bFinnish Institute of Occupational Health, Topeliuksenkatu 41 a A, FIN-00250 Helsinki, Finland |
| |
Abstract: | Oxidation of d-limonene, which is a common monoterpene, can lead to new aerosol particle formation in indoor environments. Thus, products containing d-limonene, such as citrus fruits, air refresheners, household cleaning agents, and waxes, can act as indoor air aerosol particle sources. We released d-limonene into the room air by peeling oranges and measured the concentration of aerosol particles of three different size ranges. In addition, we measured the concentration of d-limonene, the oxidant, and the concentration of ozone, the oxidizing gas. Based on the measurements we calculated the growth rate of the small aerosol particles, which were 3–10 nm in diameter, to be about , and the losses of the aerosol particles that were due to the coagulation and condensation processes. From these, we further approximated the concentration of the condensable vapour and its source rate and then calculated the formation rate of the small aerosol particles. For the final result, we calculated the nucleation rate and the maximum number of molecules in a critical cluster. The nucleation rate was in the order of and the number of molecules in a critical-sized cluster became 1.2. The results were in agreement with the activation theory. |
| |
Keywords: | Nucleation Particle growth Activation Monoterpene oxidation Indoor air particle sources |
本文献已被 ScienceDirect 等数据库收录! |
|