Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products
AbstractWe analyzed secondary organic aerosol (SOA) data from a series of small-chamber experiments in which terpene-rich vapors from household products were combined with ozone under conditions analogous to product use indoors. Reagents were introduced into a continuously ventilated 198L chamber at steady rates. Consistently, at the time of ozone introduction, nucleation occurred exhibiting similar behavior to atmospheric events. The initial nucleation burst and growth was followed by a period in which approximately stable particle levels were established, reflecting a balance between new particle formation, condensational growth, and removal by ventilation. Airborne particles were measured with a scanning mobility particle sizer (SMPS, 10–400nm) in every experiment and with an optical particle counter (OPC, 0.1–2.0μm) in a subset. Parameters for a three-mode lognormal fit to the size distribution at steady state were determined for each experiment. Increasing the supply ozone level increased the steady-state mass concentration and yield of SOA from each product tested. Decreasing the air-exchange rate increased the yield. The steady-state fine-particle mass concentration (PM1.1) ranged from 10 to >300μgm−3 and yields ranged from 5% to 37%. Steady-state nucleation rates and SOA mass formation rates were ∼10cm−3s−1 and ∼10μgm−3min−1, respectively.
Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products
AbstractWe analyzed secondary organic aerosol (SOA) data from a series of small-chamber experiments in which terpene-rich vapors from household products were combined with ozone under conditions analogous to product use indoors. Reagents were introduced into a continuously ventilated 198L chamber at steady rates. Consistently, at the time of ozone introduction, nucleation occurred exhibiting similar behavior to atmospheric events. The initial nucleation burst and growth was followed by a period in which approximately stable particle levels were established, reflecting a balance between new particle formation, condensational growth, and removal by ventilation. Airborne particles were measured with a scanning mobility particle sizer (SMPS, 10–400nm) in every experiment and with an optical particle counter (OPC, 0.1–2.0μm) in a subset. Parameters for a three-mode lognormal fit to the size distribution at steady state were determined for each experiment. Increasing the supply ozone level increased the steady-state mass concentration and yield of SOA from each product tested. Decreasing the air-exchange rate increased the yield. The steady-state fine-particle mass concentration (PM1.1) ranged from 10 to >300μgm−3 and yields ranged from 5% to 37%. Steady-state nucleation rates and SOA mass formation rates were ∼10cm−3s−1 and ∼10μgm−3min−1, respectively.
Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products
Coleman, Beverly K. (Autor:in) / Lunden, Melissa M. (Autor:in) / Destaillats, Hugo (Autor:in) / Nazaroff, William W. (Autor:in)
Atmospheric Environment ; 42 ; 8234-8245
22.07.2008
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Hydroxyl radical yields from reactions of terpene mixtures with ozone
| Online Contents | 2011