A new ozone denuder for aerosol sampling based on an ionic liquid coating.
A new ionic liquid 1-octyl-3,5-dimethylpyridinium iodide ([O35LUT](+)[I](-)) was synthesized and utilized as coating for an ozone denuder device based on a high-volume aerosol sampler (30 m(3) h(-1)). Particle transmission of the denuder was studied, and over 99% of particles ranging from 10 to 2,500 nm were transmitted. The device, containing 4.66 g of ionic liquid, was used outdoors, under dry and damp atmospheric conditions. In order to expose the device to an average concentration of 120 ppbv (240 microg m(-3)) of ozone in air, an additional production of ozone was directly injected into the denuder. Under these conditions, over 97% of ozone was removed for approximately 120 h (5 days). Therefore, iodide-based ionic liquids can be used as a new alternative to conventional denuder coatings in order to reduce artifacts occurring during sampling of particulate matter. Future applications are not limited to ozone removal for specific aerosol sampling methods.
Albinet
Alexandre
A
Laboratoire Chimie Moléculaire Environnement (LCME-Polytech'Savoie), Université de Savoie, Campus de Savoie Technolac, 73376 Le Bourget du Lac, France. alexandre.albinet@gmail.com
Papaiconomou
Nicolas
N
Estager
Julien
J
Suptil
Joël
J
Draye
Micheline
M
Besombes
Jean-Luc
JL